functions of the stabilator instructor: cw2 scott paul rogers
TRANSCRIPT
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Functions of the Stabilator
Instructor:
CW2 Scott Paul Rogers
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STABILATOR
TLO: To reinforce basic system fundamentalsfor the UH-60 IPC.
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STABILATOR SYSTEM
The Stabilator is a variable angle of incidence airfoilthat enhances aircraft handling qualities in the pitchaxis. The system performs both static and dynamicstability.
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STABILATOR SYSTEM
ACTUATORS
AIRSPEEDSENSORS
AM
PL
IFIE
RS
ACCELEROMETERS
POSITIO
N
INDICATORS
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STABILATOR ACTUATORS
• Identical Actuators• Tail Pylon• Position the Stabilator• Screw Jack Drive• D/C ESS BUS (#1)
# 2
#1
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STABILATOR AMPLIFIERS
• Identical Amplifiers• Aft Overhead Cabin• Pitch Rate Gyros• Auto/ manual control# 1
# 2
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AIRSPEED SENSORS
• Airspeed transducer• Air data transducer• Cockpit bulkheads• DC signal 30-180 knts• Signal to Stab Amps
AIRSPEED
AIR DATA
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LATERAL ACCELEROMETER
• Bank to turn rate• DC signal to amplifier• Mounted in cabin
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COLLECTIVE POSITION TRANSDUCERS
• On mixing unit• Forward #1 amplifier• DC signal to amplifier
#2#1
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POSITION INDICATORS
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CYCLIC MOUNTED STABILATOR SLEW SWITCH
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STABILATOR CONTROL PANEL
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STABILATOR
5 FUNCTIONS
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STABILATOR FUNCTIONS
Align stabilator and main rotor down wash in low speed flight to minimize nose-up attitude resultingfrom downwash.
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STABILATOR FUNCTIONS
Decrease angle of incidence with increased airspeedto improve static stability.
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STABILATOR FUNCTIONS
Provide collective coupling to minimize pitch attitude excursions due to collective inputs from the pilot.
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STABILATOR FUNCTIONS
Provide side slip to pitch coupling to reducesusceptibility to gusts or out of trim condition.
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STABILATOR FUNCTIONS
Provide pitch rate feedback to improve dynamicstability
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EMERGENCY PROCEDURES
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AUTO MODE FAILURE
1. Cyclic mounted stabilator slew-up switch - Adjust if necessary to arrest nose down pitch rate.
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AUTO MODE FAILURE
2. AUTO CONTROL switch - Press ON once.
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AUTO MODE FAILURE
If automatic control is not regained:3. Manually slew stabilator - Adjust to 0 for
flight above 40 KIAS or full down when airspeed is below 40 KIAS. The preferred method of manually slewing the stabilator up is to use the cyclic mounted stabilator slew-up switch.
4. LAND AS SOON AS PRACTICABLE.
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AUTO MODE FAILURE
If manual control is not possible:
5. STAB POS indicator - Check and fly at or below KIAS LIMITS shown on placard.
6. LAND AS SOON AS PRACTICABLE.
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UNCOMMANDED NOSE DOWN
1. Cyclic - Adjust as required.
2. Collective - Maintain or increase.
3. Cyclic mounted stabilator slew-up switch - Adjust as required to arrest nose down pitch rate.
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UNCOMMANDED NOSE DOWN
4. MAN SLEW switch - Adjust to 0 at 40 KIAS and full down at airspeeds below 40 KIAS.
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UNCOMMANDED NOSE DOWN
5. LAND AS SOON AS PRACTICABLE.
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UNCOMMANDED NOSE UP
1. Cyclic - Adjust as required.
2. Collective - Reduce as required.
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UNCOMMANDED NOSE UP
4. MAN SLEW switch - Adjust to 0 at 40 KIAS and full down at airspeeds below 40 KIAS.
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UNCOMMANDED NOSE UP
5. LAND AS SOON AS PRACTICABLE.
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WARNINGS
If the airspeed fault advisory light is illuminated, continuedflight above 70 KIAS with the stabilator in the AUTO MODEis unsafe since a loss of the airspeed signal from the remainingairspeed sensor would result in the stabilator slewing full-down
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WARNINGS
If acceleration is continued or collective is decreased withthe stabilator in a trailing edge down position, longitudinalcontrol will be lost. The stabilator shall be slewed to 0 above 40 KIAS and full-down when airspeed is less than40 KIAS.
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WARNINGS
Pressing the AUTO CONTROL RESET button after afailure occurs results in the automatic mode coming onfor one second. If a hardover signal to one actuator ispresent, the stabilator could move 4 to 5 in that one secondbefore another auto mode failure occurs. Subsequentreset attempts could result in the stabilator moving toan unsafe position.
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WARNINGS
If the stabilator AUTO mode repeatedly disengages duringa flight, flight above 70 knots is prohibited with the stabilatorin to AUTO mode.
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QUESTIONS?