tm 55-1520-210-23-1

TM 55-1520-210-23-1

TECHNICAL MANUAL

AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS

This manual supersedes TM 55-1520-210-23-1, 20 February 1979, including all changes.

HEADQUARTERS, DEPARTMENT OF THE ARMY 30 SEPTEMBER 1987

TM 55-1520-210-23-1

Personnel performing operations, procedures, and practices which are included or implied in this technical manual shall observe the following warnings. Disregard of these warnings and precautionary information can cause serious injury, or death. Warnings, cautions, and notes are used to emphasize important and critical instructions and are used for the following conditions:

An operating procedure, practice, etc., which, if not correctly followed, could result in personal injury or loss of life.

An operating procedure, practice, etc., which, if not strictly observed, could result in damage to or destruction of equipment. NOTE An operating procedure, condition, etc., which it is essential to highlight. NOISE Sound pressure levels in this helicopter during some operating conditions exceed the Surgeon General hearing conservation criteria, as defined in TB MED 501. Hearing protection devices, such as aviator helmet or ear plugs are required to be worn by all personnel in and around the helicopter during its operation. ELECTROLYTE Corrosive Battery Electrolyte (Potassium Hydroxide). Wear rubber gloves, apron, and face shield when handling leaking batteries. If potassium hydroxide is spilled on clothing, or other material wash immediately with clean water. If spilled on personnel immediately start flushing the affected area with clean water. Continue washing until medical assistance arrives. TOXIC POISONS Turbine fuels and lubricating oils contain additives which are poisonous and readily absorbed through the skin. Do not allow them to remain on skin longer than necessary.

HANDLING HYDRAULIC FLUID (MIL-H-83282 Prolonged contact with liquid or mist can irritate eyes and skin. After any prolonged contact with skin, immediately wash contacted area with soap and water. If liquid contacts eyes, flush immediately with clear water. If liquid is swallowed, do not induce vomiting; get immediate medical attention. Wear rubber gloves when handling liquid. If prolonged contact with mist is likely, wear an apporopriate respirator. When fluid is decomposed by heating, toxic gases are released. a

TM 55-1520-210-23-1 STARTING HELICOPTER Starting and operation of the helicopter will be performed only by authorized personnel in accordance with AR 95-1. GROUNDING HELICOPTER

The helicopter should be electrically grounded when parked. Turn off all power switches before making electrical connections or disconnections. Serious burns and electrical shock can result from contact with exposed electrical wires or connectors. Before removing any engine ignition system component, ground the leads to dissipate any stored voltage in ignition unit. FIRE EXTINGUISHER Exposure to high concentrations of monobromotrifluoromethane (CF3BR) extinguishing agent or decomposition products should be avoided. The liquid should not be allowed to come into contact with the skin, as it may cause frost bite or low temperature burns. ARMAMENT Loaded weapons, or weapons being loaded or unloaded, shall be pointed in a direction which offers the least exposure to personnel or property in the event of accidental firing. Personnel shall remain clear of hazardous area of all loaded weapons. ANY ROTATION OF THE GUN ARMAMENT SUBSYSTEM BARRELS WILL CAUSE THE GUN TO FIRE. Upon landing, immediately alert personnel to probable presence of live rounds in the gun. Summon armament repairman to clear weapon. FUELING AND DEFUELING When refueling helicopter, the refueling vehicle or forward air refueling unit must be parked a minimum of 20 feet from the helicopter. Before starting the fueling operation, always insert fueling nozzle grounding chain of fuel truck ground wire into GROUND HERE receptacle located on the right side of the helicopter aft of the cabin area. Refer to FM 10-68. When defueling, turn off all electrical switches and disconnect external power from the helicopter. The helicopter must be electrically grounded prior to defueling. RADIOACTIVE MATERIALS

Self-luminous dials and ignition units may contain radioactive materials. if such an instrument or unit is broken or becomes unsealed, avoid personal contact. Use forceps or gloves made of rubber or polyethylene to pick up contaminated material. Place materials and gloves in a plastic bag. Seal bag and dispose of it as radioactive waste in accordance with AR755-15 and TM 3-261 (Refer to TB 43-0108). Repair procedures shall conform to requirements in AR700-52. CLEANING SOLVENTS

Cleaning solvents may be flammable and toxic. Use only in well ventilated areas. Avoid inhalation of vapor and skin contact. Do not use solvents near open flame or in areas where very high temperatures prevail. ROTOR BLADES

Personnel will stay clear of rotor blades during operation. Refer to Chapter 1 for rotor blade dimensions and clearances. b

TM 55-1520-210-23-1

TOOLS Use only chrome plated steel or unplated steel tools for disassembly or reassembly procedures. Because the platings are prone to chipping and flaking, the use of cadmium or zink plated tools is not permitted. If these chips or flakes become embedded in aircraft parts, galvanic corrosion will result. If these chips or flakes enter fuel or oil wetted components, they may eventually clog the filter or produce intergranular attack of nickel or titanium base alloys at elevated temperatures. Regardless of the type of plating, all tools must be serviceable and free of chipping.

c

TM 55-1520-210-23-1 C43

CHANGE NO. 43

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HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 22 December 2003 Aviation Unit and Intermediate Maintenance Instructions

ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.TM 55-1520-210-23-1, dated 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through H 1-17 through 1-22 1-25 through 1-30 1-45 and 1-46 1-111 and 1-112 2-149 and 2-150 2-154.5 and 2-154.6 5-33 and 5-34 5-83 and 5-84 6-87 through 6-90 6-138.1/(6-138.2 blank) 6-165 and 6-166 Insert pages A through H 1-17 through 1-22 1-25 through 1-30 1-45 and 1-46 1-111 and 1-112 2-149 and 2-150 2-154.5 and 2-154.6 5-33 and 5-34 5-83 and 5-84 6-87 through 6-90 6-138.1/(6-138.2 blank) 6-165 and 6-166

2. Retain this sheet in front of manual for reference purposes.

TM 55-1520-210-23-1 C43

By Order of the Secretary of the Army: Official: PETER J. SCHOOMAKER General, United States Army Chief of Staff

JOEL B. HUDSON Administrative Assistant to the Secretary of the Army0331605

DISTRIBUTION: To be distributed in accordance with initial distribution number (IDN) 311408, requirements for TM 55-1520-210-23-1.

TM 55-1520-210-23-1 C 42

CHANGE NO. 42

}Aviation Unit and Intermediate Maintenance Instructions

HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 14 April 2003


DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.TM 55-1520-210-23-1, dated 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through H P-1 and P-2 i and ii 1-21 and 1-22 1-30.3 and 1-30.4 1-37 and 1-38 1-105 and 1-106 1-111 and 1-112 2-119 and 2-120 2-154.5/(2-154.6 blank) 3-14.1 and 3-14.2 4-42.3 and 4-42.4 4-43 through 4-46 4-57 and 4-58 4-73 and 4-74 4-93 and 4-94 5-9 and 5-10 5-15 and 5-16 5-25 through 5-28 5-33 and 5-34 5-67 and 5-68 5-68.1 and 5-68.2 5-69 and 5-70 5-85 and 5-86 5-91 and 5-92 5-103 and 5-104 5-109 and 5-110 6-23 and 6-24 Insert pages A through H P-1 and P-2 i and ii 1-21 and 1-22 1-30.3 and 1-30.4 1-37 and 1-38 1-105 and 1-106 1-111 and 1-112 2-119 and 2-120 2-154.5 and 2-154.6 3-14.1 and 3-14.2 4-42.3 and 4-42.4 4-43 through 4-46 4-57 and 4-58 4-73 and 4-74 4-93 and 4-94 5-9 and 5-10 5-15 and 5-16 5-25 through 5-28 5-33 and 5-34 5-67 and 5-68 5-68.1 and 5-68.2 5-69 and 5-70 5-85 and 5-86 5-91 and 5-92 5-103 and 5-104 5-109 and 5-110 6-23 and 6-24

TM 55-1520-210-23-1 C 42

Remove pages6-43 and 6-44 6-44.1 through 6-44.4 6-49 and 6-50 6-60.1/(6.60.2 blank) 6-89 through 6-92 6-101 and 6-102 6-116.5 and 6-116.6 6-137 and 6-138 6-138.1 through 6-138.3/(6-138.4 blank) 6-139 and 6-140 6-147 and 6-148 6-165 and 6-166 6-166.5/(6-166.6 blank) Index-13 and Index-14

Insert pages6-43 and 6-44 6-44.1 through 6-44.4 6-49 and 6-50 6-60.1/(6.60.2 blank) 6-89 through 6-92 6-101 and 6-102 6-116.5 and 6-116.6 6-137 and 6-138 6-138.1 through 6-138.3/(6-138.4 blank) 6-139 and 6-140 6-147 and 6-148 6-165 and 6-166 6-166.5/(6-166.6 blank) Index-13 and Index-14

2. Retain this sheet in front of manual for reference purposes. By Order of the Secretary of the Army:ERIC K. SHINSEKI General, United States Army Chief of Staff

Official:


Distribution: To be distributed in accordance with Initial Distribution Number (IDN) 311408, requirements for TM 55-1520-210-23-1.

URGENTTM 55-1520-210-23-1 C41

CHANGE NO. 41

}Aviation Unit and Intermediate Maintenance Instructions

HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 July 2002


DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.TM 55-1520-210-23-1, dated 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through H 1-109 through 1-114 6-137 through 6-140 6-146.1 and 6-146.2 6-147/(6-148 blank) 6-151 and 6-152 6-165 and 6-166 6-166.3 through 6-166.5/(6-166.6 blank) Insert pages A through H 1-109 through 1-114 6-137 through 6-140 6-146.1 and 6-146.2 6-147 and 6-148 6-151 and 6-152 6-165 and 6-166 6-166.3 through 6-166.5/(6-166.6 blank)

2. Pages 1-111 through 1-114 correct errors associated with urgent change 40. 3. Retain this sheet in front of manual for reference purposes. By Order of the Secretary of the Army:ERIC K. SHINSEKI General, United States Army Chief of Staff

Official:



URGENT

URGENTTM 55- 1520- 210-23- 1 - C 40 CHANGE NO. 40 Aviation Unit and Intermediate Maintenance Instructions HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 19 April 2002

ARMY MODEL UH--1H/V/EH--1H/X HELICOPTERSDISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited TM 55-1520-210- 23-1, 30 September 1987, is changed as follows: - 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through H 1--113 and 1--114 6--137 and 6--138 6--147/(6--148 blank) 2. Insert pages A through H 1--113 and 1--114 6--137 and 6--138 6--147/(6--148 blank)

Retain this sheet in front of manual for reference purposes.

By Order of the Secretary of the Army:Official: ERIC K. SHINSEKI General, United States Army Chief of Staff


DISTRIBUTION To be distributed in accordance with Initial Distribution Number 311408, requirements for TM 55--1520--210--23--1.

URGENT

URGENTCHANGE NO. 39

TM 55-1520-210-23-1 C39

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HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 15 October 2001 Aviation Unit and Intermediate Maintenance Instructions


DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimitedTM 55-1520-210-23-1, dated 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through H 1-111 through 1-114 5-54.45 and 5-54.46 5-65 and 5-66 5-72.5 and 5-72.6 5-87 and 5-88 5-101 through 5-104 6-105 and 6-106 Insert pages A through H 1-111 through 1-114 5-54.45 and 5-54.46 5-65 and 5-66 5-72.5 and 5-72.6 5-87 and 5-88 5-101 through 5-104 6-105 and 6-106 6-106.1/(6-106.2 blank)

2. Retain these sheets in front of manual for reference purposes.

By Order of the Secretary of the Army:

Official:

ERC K. SHINSEKI General, United States Army Chief of Staff



URGENT

URGENTTM 55-1520-210-23-1 C 38 CHANGE NO. 38 Aviation Unit and Intermediate Maintenance Instructions HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 6 July 2001

ARMY MODEL UH--1H/V/EH--1H/X HELICOPTERSDISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through H P--1 and P--2 1--113 and 1--114 2--153 and 2--154 2. Insert pages A through H P--1 and P--2 1--113 and 1--114 2--153 through 2--154.5/(2--154.6 blank)


By Order of the Secretary of the Army: ERIC K. SHINSEKI General, United States Army Chief of Staff

OFFICIAL: JOEL B. HUDSON Administrative Assistant to the Secretary of the Army0117207

DISTRIBUTION To be distributed in accordance with Initial Distribution Number 311408, requirements for TM 55-1520-210-23-1.

URGENT

TM 55-1520-210-23-1 C37CHANGE NO. 37 Aviation Unit And Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C. 15 January 2001

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. TM 55-1520-210-23-1, dated 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages A through G / (H blank) i and ii 1-1 and 1-2 1-5 through 1-8 1-15 through 1-18 1-30.1 through 1-30.4 1-95 and 1-96 1-105 through 1-110 2-1 and 2-2 2-31 and 2-32 2-53 and 2-54 2-59 and 2-60 2-63 through 2-68 2-73 and 2-74 2-79 and 2-80 2-83 through 2-88.2 2-91 through 2-94 2-103 and 2-104 2-107 and 2-108 2-115 and 2-116 2-119 and 2-120 2-130.1 / (2-130.2 blank) 2-147 through 2-150 2-153 and 2-154 2-157 and 2-158 2-181 and 2-182 2-183 through 2-188 2-197 and 2-198 Insert pages A through H i and ii 1-1 and 1-2 1-5 through 1-8 1-15 through 1-18 1-30.1 through 1-30.4 1-95 and 1-96 1-105 through 1-110 2-1 and 2-2 2-31 and 2-32 2-53 and 2-54 2-59 and 2-60 2-63 through 2-68 2-73 and 2-74 2-79 and 2-80 2-83 through 2-88.2 2-91 through 2-94 2-103 and 2-104 2-107 and 2-108 2-115 and 2-116 2-119 and 2-120 2-130.1 / (2-130.2 blank) 2-147 through 2-150 2-153 and 2-154 2-157 and 2-158 2-181 and 2-182 2-183 through 2-188 2-197 and 2-198

TM 55-1520-210-23-1 C37Remove pages 2-207 and 2-208 2-227 through 2-230 2-247 and 2-248 2-255 and 2-256 3-1 through 3-4 3-7 and 3-8 3-14.1 and 3-14.2 3-15 and 3-16 4-13 and 4-14 4-17 and 4-18 4-23 and 4-24 4-29 and 4-30 4-35 and 4-36 4-42.1 through 4-42.4 4-42.5 through / (4-42.8 blank) 4-43 through 4-46 4-47 and 4-48 4-53 and 4-54 4-57 through 4-60.4 4-60.5 through 4-60.8 4-67 and 4-68 4-71 through 4-74 4-79 and 4-80 4-87 and 4-88 4-107 and 4-108 5-21 and 5-22 5-29 and 5-30 5-32.1 and 5-32.2 5-39 and 5-40 5-40.1 / (5-40.2 blank) 5-41 through 5-44 5-54.45 and 5-54.46 5-54.49 / (5-54.50 blank) 5-68.1 and 5-68.2 5-71 and 5-72 5-73 and 5-74 5-79 and 5-80 5-83 and 5-84 5-93 and 5-94 5-99 through 5-102 5-107 through 5-110 5-121 and 5-122 Insert pages 2-207 and 2-208 2-227 through 2-230 2-247 and 2-248 2-255 and 2-256 3-1 through 3-4 3-7 and 3-8 3-14.1 and 3-14.2 3-15 and 3-16 4-13 and 4-14 4-17 and 4-18 4-23 and 4-24 4-29 and 4-30 4-35 and 4-36 4-42.1 through 4-42.4 4-42.5 through / (4-42.8 blank) 4-43 through 4-46 4-47 and 4-48 4-53 and 4-54 4-57 through 4-60.4 4-60.4.1 / (4-60.4.2 blank) 4-60.5 through 4-60.12 4-67 and 4-68 4-71 through 4-74 4-79 and 4-80 4-87 and 4-88 4-107 and 4-108 5-21 and 5-22 5-29 and 5-30 5-32.1 and 5-32.2 5-39 and 5-40 5-40.1 / (5-40.2 blank) 5-41 through 5-44 5-54.45 and 5-54.46 5-54.49 / (5-54.50 blank) 5-68.1 and 5-68.2 5-71 and 5-72 5-73 and 5-74 5-79 and 5-80 5-83 and 5-84 5-93 and 5-94 5-99 through 5-102 5-107 through 5-110 5-121 and 5-122

TM 55-1520-210-23-1 C37Remove pages 5-124.1 / (5-124.2 blank) 5-131 and 5-132 6-7 through 6-10 6-13 and 6-14 6-21 and 6-22 6-25 and 6-26 6-39 and 6-44 6-44.1 and 6-44.2 6-47 and 6-48 6-60.1 / (6-60.2 blank) 6-61 and 6-62 6-65 and 6-66 6-71 and 6-72 6-79 through 6-84 6-87 and 6-88 6-93 through 6-98 6-113 through 6-116.4 6-127 and 6-128 6-129 and 6-130 6-133 and 6-134 6-137 and 6-138 6-138.1 / (6-138.2 blank) 6-141 and 6-142 6-146.1 and 6-146.2 6-147 / (6-148 blank) 6-149 and 6-150 6-153 and 6-154 6-161 and 6-162 6-165 through 6-166.2 6-171 through 6-172.2 Index-5 and Index-6 2. Insert pages 5-124.1 / (5-124.2 blank) 5-131 and 5-132 6-7 through 6-10 6-13 and 6-14 6-21 and 6-22 6-25 and 6-26 6-39 and 6-44 6-44.1 and 6-44.2 6-47 and 6-48 6-60.1 / (6-60.2 blank) 6-61 and 6-62 6-65 and 6-66 6-71 and 6-72 6-79 through 6-84 6-87 and 6-88 6-93 through 6-98 6-113 through 6-116.4 6-127 and 6-128 6-129 and 6-130 6-133 and 6-134 6-137 and 6-138 6-138.1 / (6-138.2 blank) 6-141 and 6-142 6-146.1 and 6-146.2 6-147 / (6-148 blank) 6-149 and 6-150 6-153 and 6-154 6-161 and 6-162 6-165 through 6-166.2 6-171 through 6-172.2 Index-5 and Index-6

Retain these sheets in front of manual for reference purposes.

TM 55-1520-210-23-1 C37


ERIC K. SHINSEKI General, United States Army Chief of Staff OFFICIAL:

SIGN

JOEL B. HUDSON Administrative Assistant to the Secretary of the Army 0030716

DISTRIBUTION: To be distributed in accordance with Initial Distribution Number 311408, requirements for TM 55-1520-210-23-1.

URGENTTM 55-1520-210-23-1 C36 CHANGE NO. 36 Aviation Unit and Intermediate Maintenance Instructions HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 19 Nov 1999

ARMY MODEL UH-1 H/V/EH-1 H/X HELICOPTERSDISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimitedTM 55-1520-21O-23-1, 30 September 1987, is changed as follows: Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in I. the margin. An illustration change is indicated by a miniature pointing hand. Remove pages P-l and P-2 1-115 and 1-116 1-123 and 1-124 4-45 and 4-46 2. Insert pages A through G P-1 and P-2 1-115 and 1-116 1-123 and 1-124 4-45 and 4-46 4-46.1/(4-46.2 blank)


By Order of the Secretary of the Army: General,United States Army Chief of StaffERIC K. SHINSEKI

Administrative Assistant to the Secretary of the Army9931901

DISTRIBUTION To be distributed in accordance with Initial Distribution Number 311408, requirements for TM 55-1520-210-23-1.

URGENT

URGENTTM 55-1520-210-23-1 C35 CHANGE NO. 35 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 22 January 1998

Aviation Unit and Intermediate Maintenance Instructions

ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERSDISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimitedTM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indited by vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages i and ii 1-111 and 1-112 Insert pages i and ii 1-111 and 1-112

2.



DENNIS J. REIMER General, United States Army Chief of Staff


DISTRIBUTION: To be distributed in accordance with Initial Distribution Number 1408, requirements for TM 551520-210-23-1.

URGENTTM 55-1520-210-23-1 C 34 CHANGE NO. 34 Aviation Unit and Intermediate Maintenance Instructions HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 7 October 1996

ARMY MODEL UH-1HNIEH-1H/X HELICOPTERS

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited

TM 55-1520-210-23-1,30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-109 and 1-110 5-135 and 5-136 Insert pages 1-109 and 1-110 5-135 and 5-136 5-136.1/(5-136.2 blank) 6-39 and 6-40 2. Retain this sheet in front of manual for reference purposes. By Order of the Secretary of the Army: DENNIS J. REIMER General, United States Army Chief of StaffSIGN

6-39 and 6-40

Official: JOEL B. HUDSON Administrative Assistant to the Secretary of the Army 02679

DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 1408, requirements for TM 55-1520-210-23-1.

TM 55-1520-210-23-1 C33 CHANGE NO. 33 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1HNIEH-1HIX HELICOPTERS DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages i and ii 1-5 and 1-6 1-15 and 1-16 1-25 and 1-26 1-30.3 and 1-30.4 1-51 and 1-52 1-67 and 1-68 1-97 and 1-98 1-107 and 1-108 1-111 and 1-112 2-33 and 2-34 2-43 and 2-44 2-45 and 2-46 2-67 through 2-70 2-91 and 2-92 2-101 2-109 2-115 and 2-116 2-119 and 2-120 2-120.1 and 2-120.2 2-121 through 2-124 2-131 and 2-132 2-151 through 2-154 2-185 and 2-186 2-197 and 2-198 2-207 through 2-210 2-255 and 2-256 3-14.1 and 3-14.2 4-9 and 4-10 4-13 and 4-14 4-42.3 and 4-42.4 Insert pages i and ii 1-5 and 1-6 1-15 and 1-16 1-25 and 1-26 1-30.3 and 1-30.4 1-51 and 1-52 1-67 and 1-68 1-68.1 and 1-68.2 1-97 and 1-98 1-107 and 1-108 1-111 and 1-112 2-33 and 2-34 2-43 and 2-44 2-44.1/(2-44.2 blank) 2-45 and 2-46 2-67 through 2-70 2-91 and 2-92 2-101/(2-102 blank) 2-109/(2-110 blank) 2-115 and 2-116 2-119 and 2-120 2-120.1 and 2-120.2 2-121 through 2-124 2-131 and 2-132 2-151 through 2-154 2-185 and 2-186 2-197 and 2-198 2-207 through 2-210 2-255 and 2-256 3-14.1 and 3-14.2 4-9 and 4-10 4-13 and 4-14 4-42.3 and 4-42.4 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 28 September 1996

TM 55-1520-210-23-1 C33 Remove pages 4-49 and 4-50 4-73 and 4-74 4-78.1/(4-78.2 blank) 4-85 and 4-86 4-93 and 4-94 4-97 and 4-98 5-9 and 5-10 5-40.1/(5-40.2 blank) 5-41 and 5-42 5-51 and 5-52 5-57 through 5-60 5-65 and 5-66 5-83 and 5-84 5-103 and 5-104 5-121 and 5-122 5-124.1/(5-124.2 blank) 5-147 through 5-150 5-158.1 and 5-158.2 5-159 and 5-160 6-1 and 6-2 6-37 and 6-38 6-51 and 6-52 6-59 and 6-60 6-93 and 6-94 6-99 through 6-102 6-115 and 6-116 6-116.3 and 6-116.4 6-121 and 6-122 6-128.11/(6-128.2 blank) 6-129 and 6-130 6-141 and 6-142 6-147 and 6-148 6-149 through 6-152 6-159 and 6-160 6-165 and 6-166 6-166.1 and 6-166.2 Insert pages 4-49 and 4-50 4-73 and 4-74 4-78.1/(4-78.2 blank) 4-85 and 4-86 4-93 and 4-94 4-97 and 4-98 5-9 and 5-10 5-40.1/(5-40.2 blank) 5-41 and 5-42 5-51 and 5-52 5-57 through 5-60 5-60.1/(5-60.2 blank) 5-65 and 5-66 5-83 and 5-84 5-103 and 5-104 5-121 and 5-122 5-124.1/(5-124.2 blank) 5-147 through 5-150 5-158.1 and 5-158.2 5-159 and 5-160 6-1 and 6-2 6-37 and 6-38 6-51 and 6-52 6-59 and 6-60 6-93 and 6-94 6-99 through 6-102 6-115 and 6-116 6-116.3 and 6-116.4 6-121 and 6-122 6-129 and 6-130 6-141 and 6-142 6-147/(6-148 blank) 6-149 through 6-152 6-159 and 6-160 6-165 and 6-166 6-166.1 and 6-166.2 Electronic 2028 Instructions

2. Retain these sheets in front of manual for reference purposes.

TM 55-1520-210-23-1 C33 By Order of the Secretary of the Army: DENNIS J. REIMER General, United States Army Chief of StaffSIGN

Official:

JOEL B. HUDSON Administrative Assistant to the Secretary of the Army 02663 DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 1408, requirements for TM 55-1520-210-23-1.

URGENTTM 55-1520-210-23-1 C32 CHANGE NO. 32 Aviation Unit and Intermediate Maintenance Instructions HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 12 August 1996

ARMY MODEL UH-1HNIEH-1H/X HELICOPTERS

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-99 and 1-100 5-109 and 5-110 5-135 and 5-136 2. Retain this sheet in front of manual for reference purposes. By Order of the Secretary of the Army: DENNIS J. REIMER General, United States Army Chief of StaffSIGN

Insert pages 1-99 and 1-100 5-109 and 5-110 5-135 and 5-136

Official: JOEL B. HUDSON Administrative Assistant to the Secretary of the Army 02157


TM 55-1520-210-23-1 C31

URGENTCHANGE NO. 31 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 January 1996

Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELlCOPTERS

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Insert pages i and ii 1-105 through 1-110 1-115 through 1-125/(1-126 blank) 4-13 and 4-14 4-43 and 4-44 4-44.1/(4-44.2 blank) 4-60.1 through 4-60.8 4-97 and 4-98 5-91 and 5-92 5-103 and 5-104 6-29 and 6-30 6-41 through 6-44 6-44.1 through 6-44.5/(6-44.6 blank) 6-167 and 6-168 6-171 and 6-172 Index-5 and Index-6

Remove pages i and ii 1-105 through 1-110 4-13 and 4-14 4-43 and 4-44 4-60.1 through 4-60.7/(4-60.8 blank) 4-97 and 4-98 5-91 and 5-92 5-103 and 5-104 6-29 and 6-30 6-41 through 6-44 6-44.1 through 6-44.4 6-167 and 6-168 6-171 and 6-172 Index-5 and Index-6


TM 55-1520-210-23-1 By Order of the Secretary of the Army: DENNIS J. REIMER General, United States Army Chief of StaffSIGN

Official:

JOEL B. HUDSON Administrative Assistant to the Secretary of the Army 01331 DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 1408, requirements for TM 55-1520-210-23-1.

TM 55-1520-210-23-1 C 30 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 31 July 1995

CHANGE NO. 30

Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELlCOPTERSDISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited

TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand.

Remove pages 1-33 and 1-34 Index 5 and Index 6

Insert pages 1-33 and 1-34 Index 5 and Index 6



DENNIS J. REIMER General, United States Amy Chief of Staff

Acting Administrative Assistant to the Secretary of the Army 00362


URGENTTM 55-1520-210-23-1 C29 CHANGE NO. 29 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D. C., 12 December 1994 Aviation Unit and Intermediate Maintenance Instructions

ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERSDISTRIBUTlON STATEMENT A: Approved forPUNIC

release; distribution is unlimited.

TM 55-1520-210-23-1,30 September 1987, is changed as follows 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand.

Remove pages 1-109 and 1-110

Insert pages 1-109 and 1-110



Official:

GORDON R. SULLIVAN General, United States Army Chief of Staff



URGENT

URGENTTM 55-1520-210-23-1 C 28 CHANGE NO. 28 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 23 September 1994 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELlCOPTERS DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited TM 55-1520-210-23-1,30 September 1994, is changed as follows 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand.

Remove pages 1-109 and 1-110 4-83 through 4-66 5-13 and 5-14 5-21 and 5-22 5-32.1 and 5-32.2 5-33 and 5-34 5-37 and 5-38 5-85 and 5-86

Insert pages 1-109 and 1-110 4-83 through 4-86 5-13 and 5-14 5-21 and 5-22 5-32.1 through 5-32.3/(5-32.4 blank) 5-33 and 5-34 5-37 and 5-38 5-85 and 5-86

2. Retain this sheet in front of manual for reference purposes. By Order of the Secretary of the Army:

Official:


Administrative Assistant to the Secretary of the Army0 6 7 5 4


URGENTNOTICE : THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE, ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 27 CHANGE NO. 27 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 2 June 1993 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-99 and 1-100 2. Insert pages 1-99 and 1-100



Official: MILTON H. HAMILTON Administrative Assistant to the Secretary of the Army03959



URGENTNOTICE: IT SHOULD THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 26 CHANGE NO. 26 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 15 January 1993 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages P-1 and P-2 i and ii 1-111 through 1-114 2. Insert pages P-1 and P-2 i and ii 1-111 through 1-114



GORDON R. SULLIVAN General, United States Army Chief of Staff MILTON H. HAMILTON Administrative Assistant to the Secretary of the Army02942


URGENT

URGENT

TM 55-1520-210-23-1 C 25

NOTICE: THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE.

CHANGE NO. 25

HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 15 December 1992

Aviation Unit and Intermediate Maintenance Instructions

Army Model UH-1H/V/EH-1H/X HelicoptersDISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited TM 55-1520-210-23-1,30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-109 and 1-110 1-111 and 1-112 1-113 and 1-114 4-79 and 4-80 2028s and Envelopes 2. Retain this sheet in front of manual for reference purposes. Insert pages 1-109 and 1-110 1-111 and 1-112 1-113 and 1-114 4-78.1/(4-78.2 Blank) 4-79 and 4-80 2028s and Envelopes

URGENT

TM

55-1520-210-23-1 C 25


Official: MILTON H. HAMILTON Administrative Assistant to the Secretary of the Army02983



TM 55-1520-210-23-1 C 24 CHANGE NO. 24 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 30 NOVEMBER 1992 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS

DISTRIBUTION STATEMENT A:

Approved for public release; distribution is unlimited.

TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-5 through 1-10 ---1-11 through 1-14 1-17 and 1-18 1-21 and 1-22 1-27 through 1-30 1-30.1 through 1-30.4 1-31 through 1-36 1-81 and 1-82 1-82.1 and 1-82.2 1-103 and 1-104 1-107 and 1-108 2-53 and 2-54 2-115 and 2-116 2-185 and 2-186 2-233 and 2-234 2-255 and 2-256 3-14.1/(3-14.2 blank) 3-15 and 3-16 4-42.1 and 4-42.2 4-42.4.1 and 4-42.4.2 4-42.5 and 4-42.6 4-53 through 4-56 4-57 through 4-60 4-60.1 through 4-60.6 4-71 and 4-72 4-97 and 4-98 5-38.1 and 5-38.2 5-53 and 5-54 Insert pages 1-5 through 1-10 1-10.1/(1-10.2 blank) 1-11 through 1-14 1-17 and 1-18 1-21 and 1-22 1-27 through 1-30 1-30.1 through 1-30.4 1-31 through 1-36 1-81 and 1-82 1-82.1 and 1-82.2 1-103 and 1-104 1-107 and 1-108 2-53 and 2-54 2-115 and 2-116 2-185 and 2-186 2-233 and 2-234 2-255 and 2-256 3-14.1 and 3-14.2 3-15 and 3-16 4-42.1 and 4-42.2 4-42.4.1 and 4-42.4.2 4-42.5 and 4-42.6 4-53 through 4-56 4-57 through 4-60 4-60.1 through 4-60.6 4-71 and 4-72 4-85 and 4-86 4-97 and 4-98 5-38.1 and 5-38.2 5-53 and 5-54

TM 55-1520-210-23-1 C 24 Remove pages 5-65 and 5-66 5-81 and 5-82 5-121 and 5-122 5-127 and 5-128 5-130.1/(5-130.2 blank) 6-47 and 6-48 6-51 and 6-52 6-55 through 6-58 6-83 and 6-84 6-84.1 and 6-84.2 6-85 and 6-86 6-93 and 6-94 6-103 through 6-106 6-115 and 6-116 6-116.1 and 6-116.2 6-127 and 6-128 6-141 and 6-142 6-149 through 6-152 ---6-159 and 6-160 6-163 and 6-164 6-167 and 6-168 6-171 and 6-172 6-172.1 through 6-172.3/ (6-172.4 blank) 2. Insert pages 5-65 and 5-66 5-81 and 5-82 5-121 and 5-122 5-127 and 5-128 5-130.1/(5-130.2 blank) 6-47 and 6-48 6-51 and 6-52 6-55 through 6-58 6-83 and 6-84 6-84.1 and 6-84.2 6-85 and 6-86 6-93 and 6-94 6-103 through 6-106 6-115 and 6-116 6-116.1 and 6-116.2 6-127 and 6-128 6-141 and 6-142 6-149 through 6-152 6-158.1/(6-158.2 blank) 6-159 and 6-160 6-163 and 6-164 6-167 and 6-168 6-171 and 6-172 6-172.1 through 6-172.3/ (6-172.4 blank)


By Order of the Secretary of the Arrny:

Official:


Administrative-Assistant to the Secretary of the Army7 0732


URGENTNOTICE: THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 23 CHANGE NO. 23 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 15 October 1992 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 2-233 and 2-234 - - 2-255 and 2-256 4-53 and 4-54 5-81 and 5-82 6-127 and 6-128 - - 6-141 and 6-142 6-165 and 6-166 2. Insert pages 2-233 and 2-234 2-234.1/2-234.2 2-255 and 2-256 4-53 and 4-54 5-81 and 5-82 6-127 and 6-128 6-128.1/6-128.2 6-141 and 6-142 6-165 and 6-166




DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 1408, requirements for TM 55-1520-210-23-1. DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

URGENT

TM 55-1520-210-23-1 C 22 CHANGE NO. 22 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 31 MARCH 1993 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-5 through 1-10 1-15 through 1-18 1-23 and 1-24 1-29 and 1-30 1-30.1 through 1-30.4 1-41 and 1-42 1-51 and 1-52 1-65 and 1-66 1-95 and 1-96 1-99 and 1-100 1-105 and 1-106 2-15 through 2-20 2-23 and 2-24 2-33 and 2-34 2-53 and 2-54 2-69 and 2-70 2-99 and 2-100 2-103 and 2-104 2-143 and 2-144 2-149 through 2-152 2-195 and 2-196 2-213 and 2-214 2-253 and 2-254 3-3 and 3-4 3-4.1/(34.2 blank) 3-5 and 3-6 4-27 and 4-28 4-42.5 and 4-42.6 4-49 and 4-50 4-53 through 4-56 4-57 and 4-58 4-61 and 4-62 4-71 through 4-74 Insert pages 1-5 through 1-10 1-15 through 1-18 1-23 and 1-24 1-29 and 1-30 1-30.1 through 1-30.4 1-41 and 1-42 1-51 and 1-52 1-65 and 1-66 1-95 and 1-96 1-99 and 1-100 1-105 and 1-106 2-15 through 2-20 2-23 and 2-24 2-33 and 2-34 2-53 and 2-54 2-69 and 2-70 2-99 and 2-100 2-103 and 2-104 2-143 and 2-144 2-149 through 2-152 2-195 and 2-196 2-213 and 2-214 2-253 and 2-254 3-3 and 3-4 3-4.1/(3-4.2 blank) 35 and 3-6 4-27 and 4-28 4-42.5 and 4-42.6 4-49 and 4-50 4-53 through 4-56 4-57 and 4-58 4-61 and 4-62 4-71 through 4-74

TM 55-1520-210-23-1 C 22 Remove pages 4-77 and 4-78 4-85 and 4-86 4-97 and 4-98 5-5 and 5-6 5-19 through 5-22 5-29 and 5-30 5-30.1/(5-30.2 blank) 5-31 and 5-32 5-54.13 and 5-54.14 5-67 and 5-68 5-69 through 5-72 5-75 and 5-76 5-83 and 5-84 5-101 and 5-102 5-109 and 5-110 5-113 and 5-114 5-117 and 5-118 5-123 and 5-124 5-125 through 5-130 5-131 and 5-132 5-153 and 5-154 5-158.1 and 5-158.2 5-159 and 5-160 6-9 and 6-10 6-13 and 6-14 6-17 through 6-22 6-29 and 6-30 --6-35 through 6-38 6-41 and 6-42 6-44.3/(6-44.4 blank) 6-47 and 6-48 6-55 through 6-58 6-65 and 6-66 6-73 through 6-84 ---6-85 through 6-90 6-93 through 6-104 6-115 and 6-116 6-116.1 and 6-116.2 6-116.5 and 6-116.6 6-123 and 6-124 6-139 and 6-140 6-145 and 6-146 6-147 and 6-148 6-148.1/(6-148.2 blank) 6-149 through 6-156 6-161 through 6-164 6-166.1 and 6-166.2 6-169 and 6-170 2. Insert pages 4-77 and 4-78 4-85 and 4-86 4-97 and 4-98 5-5 and 5-6 5-19 through 5-22 5-29 and 5-30 5-30.1/(5-30.2 blank) 5-31 and 5-32 5-54.13 and 5-54.14 5-67 and 5-68 5-69 through 5-72 5-75 and 5-76 5-83 and 5-84 5-101 and 5-102 5-109 and 5-110 5-113 and 5-114 5-117 and 5-118 5-123 and 5-124 5-125 through 5-130 5-131 and 5-132 5-153 and 5-154 5-158.1 and 5-158.2 5-159 and 5-160 6-9 and 6-10 6-13 and 6-14 6-17 through 6-22 6-29 and 6-30 6-34.1/(6-34.2 blank) 6-35 through 6-38 6-41 and 6-42 6-44.3 and 6-44.4 6-47 and 6-48 6-55 through 6-58 6-65 and 6-66 6-73 through 6-84 6-84.1 and 6-84.2 6-85 through 6-90 6-93 through 6-104 6-115 and 6-116 6-116.1 and 6-116.2 6-116.5 and 6-116.6 6-123 and 6-124 6-139 and 6-140 6-145 and 6-146 6-147 and 6-148 ---6-149 through 6-156 6-161 through 6-164 6-166.1 and 6-166.2 6-169 and 6-170


URGENTNOTICE : THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C21 CHANGE NO. 21 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 15 JANUARY 1992 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-35 and 1-36 6-97 and 6-98 6-129 and 6-130 6-133 and 6-134 6-137 and 6-138 - - - 6-141 and 6-142 6-147 and 6-148 - - - 6-161 and 6-162 6-165/6-166 - - - Insert Pages 1-35 and 1-36 6-97 and 6-98 6-129 and 6-130 6-133 and 6-134 6-137 and 6-138 6-138.1/6-138.2 6-141 and 6-142 6-147 and 6-148 6-148.1/6-148.2 6-161 and 6-162 6-165 and 6-166 6-166.1 through 6-166.3/ 6-166.4

2.


URGENT

TM 55-1520-210-23-1 C21 By Order of the Secretary of the Army:


DISTRIBUTION To be distributed in accordance with DA Form 12-31-E, block no, 1408, AVUM and AVIM maintenance requirements for TM 55-1520-210-23-1.

URGENTNOTICE: IT SHOULD THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 20 CHANGE NO. 20 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 July 1991 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 4-85 and 4-86 5-4.1 and 5-4.2 2* Insert pages 4-85 and 4-86 5-4.1 and 5-4.2


By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff

Official: PATRICIA P. HICKERSON Colonel, United States Army The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no. 1408, AVUM and AVIM maintenance requirements for TM 55-1520-210-23-1.

URGENT

TM 55-1520-210-23-1 C 19 CHANGE NO. 19 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 14 June 1991 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-3 and 1-4 1-15 through 1-18 1-30.3 and 1-30.4 1-33 and 1-34 1-55 and 1-56 1-60.1 and 1-60.2 1-61 and 1-62 1-75 through 1-82 1-82.1 and 1-82.2 1-87 and 1-88 1-99 and 1-100 1-105 through 1-108 2-9 and 2-10 2-107 and 2-108 2-120.1/2-120.2 2-121 and 2-122 2-129 and 2-130 - - - 2-145 and 2-146 2-151 and 2-152 2-179 and 2-180 2-197 and 2-198 2-209 through 2-212 3-4.1/3-4.2 4-3 through 4-6 4-13 and 4-14 4-41 and 4-42 4-42.3 and 4-42.4 4-43 through 4-46 4-57 through 4-60 - - - 4-73 and 4-74 4-77 and 4-78 4-97 through 4-100 4-111 and 4-112 Insert pages 1-3 and 1-4 1-15 through 1-18 1-30.3 and 1-30.4 1-33 and 1-34 1-55 and 1-56 1-60.1 and 1-60.2 1-61 and 1-62 1-75 through 1-82 1-82.1 and 1-82.2 1-87 and 1-88 1-99 and 1-100 1-105 through 1-108 2-9 and 2-10 2-107 and 2-108 2-120.1 and 2-120.2 2-121 and 2-122 2-129 and 2-130 2-130.1/2-130.2 2-145 and 2-146 2-151 and 2-152 2-179 and 2-180 2-197 and 2-198 2-209 through 2-212 3-4.1/3-4.2 4-3 through 4-6 4-13 and 4-14 4-41 and 4-42 4-42.3 and 4-42.4 4-43 through 4-46 4-57 through 4-60 4-60.1 through 4-60.7/4-60.8 4-73 and 4-74 4-77 and 4-78 4-97 through 4-100 4-111 and 4-112

TM 55-1520-210-23-1 C 19 Remove pages 5-15 and 5-16 5-32.1 and 5-32.2 5-33 and 5-34 5-43 and 5-44 5-79 through 5-82 5-101 through 5-104 5-115 through 5-118 5-155 and 5-156 5-158.1/5-158.2 6-29 and 6-30 6-37 through 6-44 --- 6-45 through 6-48 6-55 through 6-58 6-59 and 6-60 ---6-67 and 6-68 6-71 through 6-74 6-79 through 6-86 6-97 through 6-100 6-103 through 6-108 6-115 and 6-116 6-116.3 and 6-116.4 6-137 and 6-138 6-138.1/6-138.2 6-139 6-145 - - 6-147 6-149 6-163 6-167 - - through 6-142 and 6-146 and 6-148 through 6-154 and 6-164 through 6-172 Insert pages 5-15 and 5-16 5-32.1 and 5-32.2 5-33 and 5-34 5-43 and 5-44 5-79 through 5-82 5-101 through 5-104 5-115 through 5-118 5-155 and 5-156 5-158.1 and 5-158.2 6-29 and 6-30 6-37 through 6-44 6-44.1 through 6-44.3/6-44.4 6-45 through 6-48 6-55 through 6-58 6-59 and 6-60 6-60.1/6-60.2 6-67 and 6-68 6-71 through 6-74 6-79 through 6-86 6-97 through 6-100 6-103 through 6-108 6-115 and 6-116 6-116.3 and 6-116.4 6-138 and 6-138 6-138.1 through 6-138.3/ 6-138.4 6-139 through 6-142 6-145 and 6-146 6-146.1 and 6-146.2 6-147 and 6-148 6-149 through 6-154 6-163 and 6-164 6-167 through 6-172 6-172.1 through 6-172.3/ 6-172.4 6-173 and 6-174 Index 1 through Index 14

6-173/6-174 Index 1 through Index 14 2.


TM 55-1520-210-23-1 C 19




URGENTTM 55-1520-210-23-1 C 18 CHANGE NO. 18 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 14 May 1991 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-109 through 1-1 14 5-147 and 5-148 5-159 and 5-160 2. Insert pages 1-109 through 1- 14 5-147 and 5-148 5-159 and 5-160


By order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff

Official: PATRICIA P. HICKERSON Colonel, United States Army The Adjutant General


URGENT

URGENTNOTICE : THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 17 CHANGE NO. 17 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 28 February 1991 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 4-41 and 4-42 4-42.3 and 4-42.4 4-42.4.1 and 4-42.4.2 4-42.5 and 4-42.6 2. Insert pages 4-41 and 4-42 4.42.3 and 4-42.4 4-42.4.1 and 4-42.4.2 4-42.5 and 4-42.6



Official: THOMAS F. SIKORA Brigadier General, United States Army The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31-E, block no 1408, AVUM and AVIM maintenance requirements for TM 55-1520-210-23-1.

URGENT

URGENTNOTICE: IT SHOULD THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 16 CHANGE NO. 16 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 11 December 1990 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 4-42.3 and 4-42.4 4-42.4.1 and 4-42.4.2 2. Insert pages 4-42.3 and 4-42.4 4-42.4.1 and 4-42.4.2



official: THOMAS F. SIKORA Brigadier General, United States Army The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance requirements for UH-1H, UH-1V Helicopter, Utility, EH-1H Helicopter, Electronic Countermeasure, and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

URGENTNOTICE : THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 15 CHANGE NO. 15 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 SEPTEMBER 1990 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 5-91 and 5-92 5-103 and 5-104 2. Insert pages 5-91 and 5-92 5-103 and 5-104


By Order of the Secretary of the Army: CARL E. VUONO General,United States Army Chief of Staff

official: THOMAS F. SIKORA Brigadier General, United States Army The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance requirements for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

URGENTNOTICE : THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 14 CHANGE No. 14 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 August 1990 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-113 and 1-114 4-42.1 through 4-42.4 --- 2. Insert pages 1-113 and 1-114 4-42.1 through 4-42.4 4-42.4.1 through 4-42.4.4




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance requirements for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept

URGENT

URGENTTM 55-1520-210-23-1 C 13 CHANGE NO. 13 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 August 1990 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages P-1 and P-2 1-11 through 1-22 1-25 through 1-30 1-30.1 through 1-30.5 1-30.6 1-35 through 1-38 1-53 through 1-56 1-63 through 166 1-75 and 1-76 1-79 and 1-80 1-83 through 1-86 1-91 through 1-94 1-95 and 1-96 1-99 through 1-110 2-1 and 2-2 2-17 through 2-20 2-31 through 2-36 2-45 and 2-46 2-53 through 2-56 2-69 and 2-70 2-83 through 2-88 2-88.1 and 2-88.2 2-89 and 2-90 2-115 and 2-116 2-119 and 2-120 2-121 and 2-122 2-135 and 2-136 2-139 and 2-140 2-143 and 2-144 - - - 2-151 through 2-154 - - 2-185 and 2-186 2-193 through 2-198 2-205 through 2-218 Insert pages P-1 and P-2 1-11 through 1-22 1-25 through 1-30 1-30.1 through 1-30.5/ 1-30.6 1-35 through 1-38 1-53 through 1-56 1-63 through 1-66 1-75 and 1-76 1-79 and 1-80 1-83 through 1-86 1-91 through 1-94 1-95 and 1-96 1-99 through 1-110 2-1 and 2-2 2-17 through 2-20 2-31 through 2-36 2-45 and 2-46 2-53 through 2-56 2-69 and 2-70 2-83 through 2-88 2-88.1 and 2-88.2 2-89 and 2-90 2-115 and 2-116 2-119 and 2-120 2-121 and 2-122 2-135 and 2-136 2-139 and 2-140 2-143 and 2-144 2-144.1/2-144.2 2-151 through 2-154 2-182.1/2-182.2 2-185 and 2-186 2-193 through 2-198 2-205 through 2-218

URGENT

TM 55-1520-210-23-1 C 13 Remove pages 2-229 and 2-230 2-233 and 2-234 2-247 and 2-248 2-255 and 2-256 2-261 and 2-262 2-269 through 2-272 3-1 through 3-4 -----3-5 through 3-8 3-13 and 3-14 ---- - 3-17 and 3-18 3-23 and 3-24 4-1 through 4-6 4-13 and 4-14 4-17 and 4-18 4-45 and 4-46 4-53 through 4-56 - - 4-57 through 4-62 4-67 and 4-68 4-71 through 4-82 4-85 and 4-86 4-89 and 4-90 4-93 through 4-98 4-107 through 4-112 5-1 and 5-2 5-3 and 5-4 5-4.1 and 5-4.2 5-5 and 5-6 5-6.1/5-6.2 5-18.1/5-18.2 5-21 and 5-22 5-32.1 and 5-32.2 5-33 and 5-34 5-38.1 through 548.3/ 5-38.4 5-39 and 5-40 5-40.1/5-40.2 5-41 and 5-42 5-45 through 5-48 5-51 through 5-54 5-54.1 through 5-54.48 5-57 and 5-58 5-61 and 5-62 5-62.1 5-63 and 5-64 5-64.1/5-64.2 5-65 and 5-66 5-68.1 and 5-68/2 5-71 and 5-72 5-85 and 5-86 5-103 and 5-104 Insert pages 2-229 and 2-230 2-233 and 2-234 2-247 and 2-248 2-255 and 2-256 2-261 and 2-262 2-269 through 2-272 3-1 through 3-4 3-4.1/3-4.2 3-5 through 3-8 3-13 and 3-14 3-14.1/3-14.2 3-17 and 3-18 3-23 and 3-24 4-1 through 4-6 4-13 and 4-14 4-17 and 4-18 4-45 and 4-46 4-53 through 4-56 4-56.1/4-56.2 4-57 through 4-62 4-67 and 4-68 4-71 through 4-82 4-85 and 4-86 4-89 and 4-90 4-93 through 4-98 4-107 through 4-112 5-1 and 5-2 5-3 and 5-4 5-4.1 and 5-4.2 5-5 and 5-6 5-6.1 and 5-6.2 5-18.1/5-18.2 5-21 and 5-22 5-32.1 and 5-32.2 5-33 and 5-34 5-38.1 through 5-38.3/ 5-38.4 5-39 and 5-40 5-40.1/5-40.2 5-41 and 5-42 5-45 through 5-48 5-51 through 5-54 5-54.1 through 5-54.49/5-54.50 5-57 and 5-58 5-61 and 5-62 5-62.1 and 5-62.2 5-63 and 5-64 5-64.1 and 5-64.2 5-65 and 5-66 5-68.1 and 5-68.2 5-71 and 5-72 5-85 and 5-86 5-103 and 5-104

TM 55-1520-210-23-1 C 13 Remove pages 5-107 through 5-110 5-113 through 5-116 5-121 through 5-124 - - 5-125 and 5-126 5-130.1/5-130.2 5-141 and 5-142 5-147 and 5-148 5-151 and 5-152 --5-153 and 5-154 --- -- 5-155 through 5-158 5-158.1 and 5-158.2 - - 5-173 and 5-174 5-183 and 5-184 5-184.1 through 5-184.3/ 5-184.4 6-23 through 6-26 6-29 and 6-30 --- - 6-31 and 6-32 6-35 through 6-44 6-47 through 6-58 - - 6-59 through 6-62 6-71 and 6-72 6-75 and 6-76 6-79 through 6-82 6-85 through 6-88 6-91 through 6-100 6-103 and 6-104 6-111 through 6-116 6-116.1 through 6-116.5/ 6-116.6 6-127 through 6-130 6-133 through 6-138 6-141 through 6-156 6-159 through 6-165/6-166 --Insert pages 5-107 through 5-110 5-113 through 5-116 5-121 through 5-124 5-124.1/5-124.2 5-125 and 5-126 5-130.1/5-130.2 5-141/5-142 5-147 and 5-148 5-151 and 5-152 5-152.1 and 5-152.2 5-153 and 5-154 5-154.1 and 5-154.2 5-155 through 5-158 5-158.1/5-158.2 5-164.1/5-164.2 5-173 and 5-174 5-183 and 5-184 5-184.1 through 5-184.3/ 5-184.4 6-23 through 6-26 6-29 and 6-30 6-30.1/6-30.2 6-31 and 6-32 6-35 through 6-44 6-47 through 6-58 6-58.1/6-58.2 6-59 through 6-62 6-71 and 6-72 6-75 and 6-76 6-79 through 6-82 6-85 through 6-88 6-91 through 6-100 6-103 and 6-104 6-111 through 6-116 6-116.1 through 6-116.6 6-127 6-133 6-141 6-159 Index through 6-130 through 6-138 through 6-156 through 6-165/6-166 1 through Index 14

TM 55-1520-210-23-1 C 13 By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff



URGENTCHANGE NO. 12 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERSTM

TM 55-1520-210-23-1 C 12 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 12 April 1990

55-1520-210-23-1, 30 September 1987, is changed as follows:

1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages Insert pages

2.

1-99 and 1-100 1-99 and 1-100 1-103 and 1-104 1-103 and 1-104 1-111 through 1-114 1-111 through 1-114 ----5-18.1/5-18.2 Retain this sheet in front of manual for reference purposes.


Official: WILLIAM J. MEEHAN II Brigadier General, United States Army The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance instructions for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

URGENTNOTICE: THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 11 CHANGE NO. 11 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 1 March 1990 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 5-17 through 5-20 5-31 and 5-32 2. Insert pages 5-17 through 5-20 5-31 and 5-32




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance instructions for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

URGENTNOTICE: THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 10 CHANGE NO. 10 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 31 January 1990 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 5-72.5 and 5-72.6 5-73 and 5-74 5-103 through 5-106 2. Insert pages 5-72.5 and 5-72.6 5-73 and 5-74 5-103 through 5-106




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance instructions for UH-1H, UH-1V Helicopter, Utility, EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

URGENTNOTICE: THIS CHANGE HAS BEEN PRINTED AND DISTRIBUTED OUT OF SEQUENCE. IT SHOULD BE INSERTED IN THE MANUAL AND USED. UPON RECEIPT OF THE EARLIER SEQUENCED CHANGE ENSURE A MORE CURRENT CHANGE PAGE IS NOT REPLACED WITH A LESS CURRENT PAGE. TM 55-1520-210-23-1 C 9

CHANGE NO. 9

HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 31 January 1990 Aviation Unit and intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows:

1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 5-21 and 5-22 5-31 and 5-32 5-32.1 and 5-32.2 5-33 and 5-34 ----5-63 and 5-64 5-65 and 5-66 Insert pages 5-21 and 5-22 5-31 and 5-32 5-32.1 and 5-32.2 5-33 and 5-34 5-34.1/5-34.2 5-63 and 5-64 5-64 and 5-66

2. Retain this sheet in front of manual for reference purposes. By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff

Official:

WILLIAM J. MEEHAN II Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance requirements for UH-1H, UH-1V Helicopter? Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

TM 55-1520-210-23-1 C8 CHANGE NO. 8 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 2 January 1990 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages i through iii iv P-1 and P-2 1-9 and 1-10 1-13 through 1-30 - - - 1-37 through 1-40 - - - 1-51 and 1-52 1-55 and 1-56 1-59 and 1-60 - - - 1-61 and 1-62 1-65 and 1-66 1-69 and 1-70 1-105 and 1-106 1-109 and 1-110 5-1 and 5-2 5-3 and 5-4 5-4.1 and 5-4 2 5-5 and 5-6 5-9 through 5-12 5-15 and 5-16 / 5-22.1 and 5-22.2 5-23 through 5-28 5-28.3/5-28.4 5-29 and 5-30 5-30.1/5-30.2 5-35 and 5-36 5-40.1/5-40.2 5-41 through 5-44 5-47 through 5-50 5-53 and 5-54 5-54.1/5-54.2 5-55 through 5-62 Insert pages i through iii/iv P-1 and P-2 1-9 and 1-10 1-13 through 1-30 1-30.1 through 1-30.5/1-30.6 1-37 through 1-40 1-42.1/1-42.2 1-51 and 1-52 1-55 and 1-56 1-59 and 1-60 1-60.1 and 1-60.2 1-61 and 1-62 1-65 and 1-66 1-69 and 1-70 1-105 and 1-106 1-109 and 1-110 5-1 and 5-2 5-3 and 5-4 5-4.1 and 5-4.2 5-5 and 5-6 5-6.1/5-6.2 5-9 through 5-12 5-15 and 5-16 5-22.1 and 5-22.2 5-23 through 5-28 5-28.3/5-28.4 5-29 and 5-30 5-30.1 and 5-30.2 5-35 and 5-36 5-40.1/5-40.2 5-41 through 5-44 5-47 and 5-48 5-53 and 5-54 5-54.1 through 5-54.48 5-55 through 5-62

Remove pages 5-65 through 5-68 5-68.1 and 5-68.2 5-69 through 5-72 5-79 and 5-80 5-87 and 5-88 5-97 through 5-100 5-107 and 5-108 5-113 through 5-118 5-118.1/5-118.2 , 5-119 and 5-120 5-127 through 5-130 5-130.1/5-130.2 5-135 through 5-138 5-141 and 5-142 5-151 through 5-158 - - - 5-183 and 5-184 - - - 2.

Insert pages 5-65 through 5-68 5-68.1 and 5-68.2 5-69 through 5-72 5-79 and 5-80 5-87 and 5-88 5-97 through 5-100 5-107 and 5-108 5-113 through 5-118 --- 5-119 and 5-120 5-127 through 5-130 5-130.1/5-130.2 5-135 through 5-138 5-141 and 5-142 5-151 through 5-158 5-158.1 and 5-158.2 5-183 and 5-184 5-184.1 through 5-184.3/5-184.4



Official: WILLIAM J. MEEHAN 11 Brigadier General, United States Army The Adjutant General

DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance requirements for JH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

TM 55-1520-210-23-1 C 7 CHANGE NO. 7 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 30 November 1989 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 5-85 and 5-86 2. Insert pages 5-85 and 5-86




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance Requirements for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure and Intercept.

URGENT

URGENTCHANGE NO. 6

TM 55-1520-210-23-1 C 6

HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 17 November 1989 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows:

1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 5-83 and 5-84 ---2. Insert pages 5-83 and 5-84 5-84.1/5-84.2




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance instructions for UH-1H, UH-1V Helicopter, Utility and EH1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure & Intercept.

URGENT

URGENTCHANGE NO. 5

TM 55-1520-210-23-1 c 5

HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 06 October 1989 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows:

1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-97 through 1-100 1-103 and 1-104 1-107 through 1-110 1-113 and 1-114 2. Insert pages 1-97 through 1-100 1-103 and 1-104 1-107 through 1-110 1-113 and 1-114


By Order of the Secretary of the Army: CARL E. VUONO General, United Stated Army Chief of Staff


DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance Instructions for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure & Intercept.

URGENT

URGENTTM 55-1520-210-23-1 C 4 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 28 July 1989 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-97 through 1-100 1-103 and 1-104 1-107 through 1-114 2. Insert pages 1-97 through 1-100 1-103 and 1-104 1-107 through 1-114




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance Instructions for UH-1H, UH-1V helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure and EH-1X Helicopter, Electronic Countermeasure & Intercept.

URGENT

URGENTTM 55-1520-210-23-1 C 3 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 23 June 1989 Aviation Unit and Intermediate Maintenance Instructions MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-82.1 and 1-82.2 5-17 and 5-18 2. Insert pages 1-82.1 and 1-82.2 5-17 and 5-18





URGENT

URGENTTM 55-1520-210-23-1 C 2 CHANGE NO. 2 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 15 May 1989 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TM 55-1520-210-23-1, 30 September 1987, is changed as follows: 1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-82.1 through 1-84 5-9 and 5-10 5-17 through 5-18.2 2. Insert pages 1-82.1 through 1-84 5-9 and 5-10 5-17 through 5-18.2





URGENT

TM 55-1520-210-23-1 C 1 CHANGE No. 1 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C., 8 January 1989 Aviation Unit and Intermediate Maintenance Instructions ARMY MODEL UH-1H/V/EH-1H/X HELICOPTERS TN 55-1520-210-23-1, 30 September 1987, is changed as follows:

1. Remove and insert pages as indicated below. New or changed text material is indicated by a vertical bar in the margin. An illustration change is indicated by a miniature pointing hand. Remove pages 1-9 and 1-10 1-21 and 1-22 1-23 and 1-24 1-51 and 1-52 1-67 and 1-68 1-71 through 1-74 1-79 through 1-82 1-83 and 1-84 1-87 through 1-90 1-93 and 1-94 1-99 and 1-100 1-103 and 1-104 1-107 through 1-114 2-119 and 2-120 2-233 and 2-234 4-5 and 4-6 4-41 and 4-42 5-1 and 5-2 5-3 and 5-4 5-5 through 5-6.1 5-9 and 5-10 5-15 through 5-18 5-19 through 5-22 5-29 through 5-32 5-33 through 5-34.2 5-38.1 and 5-38.2 5-71 and 5-72 5-109 through 5-114 5-129 through 5-130.2 6-19 and 6-20 6-83 and 6-84 Insert pages 1-9 and 1-10 1-21 and 1-22 1-23 and 1-24 1-51 and 1-52 1-67 and 1-68 1-71 and 1-74 1-79 through 1-82.2 1-83 and 1-84 1-87 through 1-90 1-93 through 1-94.1 1-99 and 1-100 1-103 and 1-104 1-107 through 1-114 2-119 and 2-120 2-233 and 2-234 4-5 and 4-6 4-41 through 4-42.8 5-1 through 5-2.2 5-3 through 5-4.2 5-5 and 5-6 5-9 and 5-10 5-15 through 5-18.2 5-19 through 5-22.2 5-28.3 and 5-28.4 5-29 through 5-32.2 5-33 and 5-34 5-38.1 and 5-38.2 5-71 through 5-72.6 5-109 through 5-114 5-129 through 5-130.2 6-19 and 6-20 6-83 and 6-84

TM 55-1520-210-23-1 C 1

Remove pages 6-101 and 6-102 6-107 and 6-108 6-115 and 6-116 2.

Insert pages 6-101 and 6-102 6-107 and 6-108 6-115 and 6-116




DISTRIBUTION: To be distributed in accordance with DA Form 12-31, AVUM and AVIM Maintenance requirements for UH-1H, UH-1V Helicopter, Utility and EH-1H Helicopter, Electronic Countermeasure.

TM 55-1520-210-23-1 TECHNICAL MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, D.C. 30 September 1987 AVIATION UNIT AND INTERMEDIATE MAINTENANCE INSTRUCTIONS ARMY MODEL UH-1H/V/EH-1 H/X This manual is printed in three volumes as follows: TM 55-1520-210-23-1, consisting of Table of Contents, preface, chapters 1 through 6. TM 55-1520-210-23-2, consisting of Table of Contents, chapters 7 through 17. TM 55-1520-210-23-3, consisting of Table of Contents, appendix A through F, and Index. The Appendixes and Index are applicable to all volumes. No. 55-1520-210-23-1

TM 55-1520-210-23-1 TABLE OF CONTENTS (Cont) Page CHAPTER Section 12 I II III 13 I 14 I II 15 UTILITY SYSTEMS Fire Detector System . . . . . . . . . . . . . . . . . . . . . . . Windshield Wiper System . . . . . . . . . . . . . . . . . . . . . Rear View Mirror . . . . . . . . . . . . . . . . . . . . . . . . . ENVIRONMENTAL CONTROL SYSTEM Heating System . . . . . . . . . . . . . . . . . . . . . . . . . . . . HOIST AND WINCHES Personnel Rescue Hoist . . . . . . . . . . . . . . . . . . . . . . . . Cargo Suspension Assembly . . . . . . . . . . . . . . . . . . . . AUXILIARY POWER PLANTS (Nonapplicable) . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . MISSION EQUIPMENT . . . . .. . . . . . . . . . . . . . . . . . . EMERGENCY EQUIPMENT . . . . .. . . . . . . . . . . . . . . . . . REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAINTENANCE ALLOCATION CHART Three Levels of Maintenance Concept . . . . . . .. . . . . . . . . . Maintenance Allocation Chart . . . . . . . .. . . . . . . . . . . . . Tools and Test Equipment . . . . . . . . . . . . . . . . . . . Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-1 12-5 12-20

CHAPTER Section CHAPTER Section

13-1

14-1 14-98

CHAPTER

15-1 16-1 17-1 A-1

CHAPTER CHAPTER

16 17

APPENDIX A APPENDIX B Section I II III IV APPENDIX c APPENDIX APPENDIX Section D E I II III IV F

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B-1 B-6 B-77 B-84 C-1 D-1

AIRCRAFT INVENTORY MASTER GUIDE . . . .. . . . . . . . . . . . ILLUSTRATED FIELD MANUFACTURE ITEMS LIST . . . . . . . . . . . . STORAGE OF AIRCRAFT General Information . . . . . . . . . . . . . . . . . . . . . . . . . . Flyable Storage . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . Short Term Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . Intermediate Storage . . . . . .. . . . . . . . . . . . . . . . . . .

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E-1 E-2.1 E-3 E-10.1 F-1 Index 1

APPENDIX INDEX

WIRING DIAGRAMS . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .............................................

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PREFACEP--1. General. a. This manual is the official document for Aviation Unit and Intermediate Maintenance of Army Model UH--1V, UH--1H, EH--1H, and EH--1X Helicopters. b. The purpose of this manual is to familiarize you with the maintenance functions to be performed at the Aviation Unit (AVUM) and Intermediate Maintenance (AVIM) levels. The Table of Contents for this manual is provided to assist in determining the chapter in the manual in which individual functions are covered. This manual provides all essential information for personnel to accomplish Aviation Unit and Intermediate Maintenance on the complete airframe, its components, and systems, excluding armament and avionics subsystem as indicated for Aviation Unit and Intermediate Maintenance activities in the Maintenance Allocation Chart (MAC). (Refer to Appendix B.) P--2. Quality Assurance/Quality Control (QA/ QC). Personnel will assure proper maintenance has been performed by verifying dimensions and tolerances contained throughout this technical manual have been complied with. P--3. Description. Army helicopter models UH--1V, UH--1H, EH--1H, and EH--1X are single engine, utility type helicopters. The EH--1H and EH--1X are especially configured for electronic counter measures missions. The fuselage is all metal construction consisting of the forward section and aft section (tailboom). The forward section provides support for the cabin, landing gear, power plant, fuel cells, transmission, and tailboom. The rotor system consists of two bladed semi-rigid main rotor and a two bladed, delta hinged tail rotor. P-4. Reporting of Errors. You can improve this manual. If you find any mistakes or if you know of a way to improve these procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publications and Blank Forms) located in the back of this manual, directly to: Commander, U.S. Army Aviation and Missile Command, ATTN: AMSAM-MMC-MC-NP, Redstone Arsenal, AL 358985000. A reply will be furnished to you. You may also provide DA Form 2028 information to AMCOM via e-mail, fax, or the World Wide Web. Our fax number is DSN 788-6546 or Commercial 256-842-6546. Our e-mail address is: [email protected]. Instructions for sending an electronic 2028 may be found at the back of this manual immediately preceding the hard copy 2028. For the World Wide Web Use: http://amcom2028.redstone.army.mil. P--5. Destruction of Army Material to Prevent Enemy Use. For destructions of Army material to prevent enemy use, refer to TM 750--244--1--5. P--6. Maintenance of Forms and Records. Mai ntenance of forms, records, and reports which are to be used by maintenance personnel at all maintenance levels are listed in and prescribed by DA PAM 738--751. P--7. Authority for Substitution. Substitution of interchange of items of material for maintenance or Department of the Army aircraft/helicopter shall not be authorized, nor shall orders be issued for shipment. Substitution or interchangeability shall only be authorized by AMCOM. P--8. Special Tools and Equipment. Aviation Unit (AVUM) and Intermediate Maintenance (AVIM) special tools and equipment will be found in TM 55--1520--210--23P Repair Parts and Special Tools List (RPSTL). Special tools and test equipment for complex tasks are included in this manual. P--9. Calibration. a. Helicopter components, accessories, and instruments requiring calibration are specified in Chapter 1. b. Special tools and test equipment shall be calibrated as specified in TB 750--25, Army Metrology and Calibration System and TB 43--180, Calibration Procedure. P--10. Storage. Refer to TM 740--90--1 and to Appendix E for Storage of Aircraft. P--11. Explanation of Change Symbols. Changes, except as noted below to the text and tables, including new material on added pages, are indicated by a verticle line in the outer margin extending close to the entire area of the material affected; exception; pages with emergency markings, which consist of black diagonal lines around three edges, may have the verticle line or change symbol placed along the inner margins.

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Symbols show current changes only. A miniature pointing hand symbol is used to denote a change to an illustration. However, a vertical bar in the outer margin, rather than miniature pointing hand is utilized where there have been extensive changes made to an illustration. Change symbols are not utilized to indicate changes in the following: a. Introductory material. b. Indexes and tabular data where changes cannot be identified. c. Blank space resulting from the deletion of text, an illustration, or a table. d. Correction of minor inaccuracies, such as spelling, punctuation, relocation of material, etc., unless such correction changes the meaning of instructive information and procedures. P--12. Engineering Authorization. All request for engineering authorization, when required by this manual will be forwarded to USA AMCOM, ATTN: AMSAM--RD--AE--I--D--U, Redstone Arsenal, AL 35898--5230. Urgent requests shall be clearly identified to insure priority handling and response. The requests shall include detailed information on the

problem, e.g. sketches, photographs, dimensional data, etc., to assist in the evaluation and prompt reply.

P--13. Designator Symbols. H

Designator symbols

, V , C B , or M B are used in conjunction with text contents, text headings and illustration titles to show limited effectivity of the material. One or more designator symbols may follow a text heading or illustration titles to show limited effectivity of the material. One or more designator symbols may follow text heading or illustration title to indicate proper effectivity, unless the material applies to all models an configurations within the manual. If the material applies to all series and configurations, no designator symbols will be used. Where practical, descriptive information shall be condensed and combined for all models to avoid duplication. The symbol H refers to UH--1H, V re-

fers to UH--1V. The symbol C B refers to the composite main rotor blade and M B refers to the metal main rotor blade.

P--2

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CHAPTER 1 AIRCRAFT GENERAL SECTION I. SERVICING 1-1. SERVICING. 1-2. Description Servicing. Instructions and information for complete servicing of the helicopter with fuel, oil, hydraulic fluid, and other fluids are provided in the following paragraphs. Locations of sight gages and drains are shown on Servicing Points Diagram with indication of how frequently each reservoir should be checked and filled or drained and refilled (figure 1-1). Instructions for use of greases and other lubrication not shown in servicing illustration will be found in figure 1-6, Lubrication Chart. 1-3. Fuel Systems Servicing. NOTE Service with specified turbine fuel (C119). When specified fuel is not available, refer to TM 55-1520-210-10 and TB 55-9150-200-24 for information on other fuels and limitations on their use. An entry shall be made on the DA Form 240813 if emergency fuel is used.

c. The helicopter can be serviced by any of the following methods. Refer to figure 1-1. (1) Closed Circuit Refueling (Power Off). (a) Make sure fire guard is in position with fire extinguisher. (b) Ground servicing unit to ground rod. (c) Make sure helicopter is statically grounded to a ground rod. (d) Bond servicing unit to helicopter (e) Bond fuel nozzle to ground receptacle (2) located below fuel receptacle on helicopter.

Servicing personnel must comply with all safety precautions specified in FM 10-68, Aircraft Refueling Field Manual.

a. Fuel Tank Capacities.FUEL TANK CAPACITY Total Usable U.S. GALLON 208.5 206.5

Make sure servicing unit pressure is not above 125 psi while refueling.

b. Approved Fuel.

ENGINE FUEL SPECIFICATION Army Standard Fuel MIL-T-5624 Grade JP-4 Alternate Fuel MIL-T-5624 Grade JP-5 Emergency Fuel MIL-G-5572 Aviation Gasoline (Refer to TB 55-9150-200-24)

(f) Remove fuel tank filler cap (3) and make sure refueling module is in closed and locked position (3.1). (g) Remove nozzle cap, insert nozzle into fuel receptacle and lock into position. (h) Position flow control handle to ON or FLOW. Fuel flow will automatically stop when fuel cell is full. Just before normal automatic shutoff, fuel flow may cycle several times as maximum fuel level is reached. (i) Make sure flow control handle is in OFF or NO FLOW position and remove nozzle. (j) Replace fuel nozzle cap and fuel tank filler cap (3).

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(k) Disconnect fuel nozzle ground cable. (l) Disconnect ground cable from helicopter to ground rod. (m) Disconnect servicing unit ground cables from ground rod and helicopter. (n) Return fire extinguisher to designated location. (2) Gravity or Open Port Refueling (Power Off).

the refueling operation (performed by authorized refueling personnel) and stand fire guard as required. One crewmember must remain in the aircraft to monitor controls. Only emergency radio transmission should be made during Rapid Refueling. (b) Make sure fire guard is in position with fire extinguisher. (c) Ground servicing unit to ground rod. (d) Make sure helicopter is statically grounded to a ground rod. (e) Bond servicing u

tm 55-1520-210-23-1

Documents

starting helicopter

grounding helicopter

skin contact

prolonged contact

alert personnel

authorized personnel

personal contact

rotor blades personnel