767 jt9d boroscope

Aircraft Inspection & Management, LLC (TUS AZ) 9860 North Camino Del Plata, Tucson, Arizona 85742 - Office (520) 399-6489 Fax (520) 579-8855

AIM

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Borescope Report for a JT9D Series Engine Client: Air Seychelles Condition Review Engine Serial # P709651 Position: Off Wing Eng. Mod -7R4D July 12th, 2008 AC Registration N/A AC Type: N/A Mfg. SN: N/A Victorville, California

Periodic Inspection Reference; JT9D Maintenance Manual 72-00 Exterior Visual Inspection:

No obvious leakage from, or damage to the installed plumbing accessories or QEC. No apparent cracking of the visible areas of the diffuser case rear rail or on the exhaust turbine case “R” or “S” rails.

Accessory Drive Gearbox: Reference; Aircraft Maintenance Manual 72-61-00, page 601-605

Accessories: No leaks to note at this time. Exhaust Nozzle: No discrepancies observed. Exhaust Cone: No discrepancies observed. Nose Cowling: Not Installed. Nose Bullet: No discrepancies observed. 1st Stage Fan Blades: One blade has damage to the shroud in area “E” from the previous shroud.

Blend IAW 72-31-02 attached for reference.

1st Stage Exit Guide Vanes:

No damage. No loose or missing stators.

Suggested Action: Blend Fan Blades shroud damage as indicated above.

JT9D Borescope Report ESN: 709651 July 12th, 2008

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Low Pressure Compressor (LPC) Reference JT9D Maintenance Manual 72-00 Pages 616-621 1.5 Stage: Several blades have small nicks on the leading edge.

Unserviceable IAW 72-00-00 page 624 attached for reference.

2nd Stage: Spot checked, no damage noted. 3rd Stage: Spot checked, no damage noted. 4th Stage: No discrepancies observed. Suggested Action: Blend the 1.5 blades indicated above. High Pressure Compressor (HPC) Reference JT9D Maintenance Manual 72-00 Pages 622-640 5th Stage: Several small discrepancies observed within AMM 72-00-00 page 633 limits, attached for reference only. 6th Stage: Several small discrepancies observed within AMM 72-00-00 page 633 limits, attached for reference only. 7th Stage: Several small discrepancies observed within AMM 72-00-00 page 633 limits, attached for reference only. 8th Stage: Several small discrepancies observed within AMM 72-00-00 page 633 limits, attached for reference only. 9th Stage: Several small discrepancies observed within AMM 72-00-00 page 633 limits, attached for reference only. 10th Stage: One blade has a trailing edge dent in area “C” measuring 0.047”,

Unserviceable IAW 72-00-00 page 633 attached for reference. No access for blending available.


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11th Stage: Blade shown below has a small dent with a crack on one side in area “E”. The dent measures 0.028” Serviceable IAW 72-00-00 page 633 attached for reference.

Blade shown below has a small nick in area “E” on the leading edge measuring 0.020”. Serviceable IAW 72-00-00 page 633 attached for reference.




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Blade shown below has a small dent in area “C” on the trailing edge measuring 0.040”. Unserviceable IAW 72-00-00 page 633 attached for reference but can be blended.

12th Stage: Blade shown below has 3 very small round bottom damage on the leading edge in area “C” that have less than

0.250” of separation between them. Unserviceable IAW 72-00-00 page 632 attached for reference only.

Blade shown below has a very small round bottom impact on the leading edge in area “D”. Serviceable IAW 72-00-00 page 637 attached for reference.

The first two pictures below appear to show a blade that has had blending accomplished on the forward edge of the platform and into the filet radius of area “D”. The third picture is of the next blade for reference. No blending is typically allowed in the filet area. Review records and/or consult MFG for disposition.

Reference Picture


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13th Stage: No access 14th Stage: Blade shown below has a dent on the trailing edge in area “C”. The dent leaves a mark on the convex side which

is Unserviceable IAW 72-00-00 page 632 and/or 633 since it measures 0.082” from the trailing edge. Blending only allowed up to 0.051”

Raised material on convex side 15th Stage: Blade shown below has a small dent in area “C” on the leading edge measuring 0.040”.

Unserviceable IAW 72-00-00 page 633 attached for reference but can be blended.

Suggested Action: Repair HPC blades indicated above and/or contact MFG for disposition.


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Combustion Section Inspection Reference JT9D Maintenance Manual 72-00 Pages 645-680B Combustion Chamber:

There are 3 areas of damage to the Inner Liner of the combustion chamber at the 6 O’clock. All three areas have circumferential cracking intersecting axial cracks on the louver body forward of the stiffener and/or the louver lip in the same liner. The circumferential cracks are only 6 to 7 inches apart, which is less than 10” minimum allowed and Unserviceable IAW 72-00-00 page 668 attached for reference. In Addition: Area 1 has a hole that is 1” wide and in excess of 0.5” maximum allowed and Unserviceable IAW 72-00-00 page 663 attached for reference. Areas 1 and 3 have a circumferential crack that extends from and beyond an axial crack approximately 2” which would require 300 hours inspections IAW 72-00-00 page 666 attached for reference. Area 2 has a continuous axial crack that connects to two circumferential cracks. Unserviceable IAW 72-00-00 pages 666 and 668 attached for reference.

Area 1 Area 2 Area 3 Suggested Action: Repair Combustion Can. Unserviceable IAW 72-00-00 pages 663, 666 and 668 HPT Nozzle Guide Vanes

Typical burning and cracking was observed to the platforms and trailing edges on many vanes and are within AMM limits.

Suggested Action: None required.


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High Pressure Turbine ( HPT ) Reference JT9D Maintenance Manual 72-00 Pages 680F-682F 1st Stage Blades No discrepancies observed. 2nd Stage Blades: No discrepancies observed. Suggested Action: None required. Low Pressure Turbine ( LPT ) Reference JT9D Maintenance Manual 72-00 Pages 682G-682M 3rd Stage Blades: No discrepancies observed. 5th Stage Blades: No Access 6th Stage Blades: No discrepancies observed. Suggested Action: None required. This report and the accompanying video is submitted on behalf of Aircraft Inspection & Management, LLC. and subject to the condition that it is understood and agreed that the contents are based on diligent inspection and are exclusive of latent defects in materials, rigging, or systems not detectable without removal or disassembly; but are believed to be correct and are fairly representative of the condition of the engine at the time of inspection and prior to any operation. This survey is submitted without prejudice and in confidence to the named client and is without responsibility to others to whom it may be shown. Maintenance Manual pages attached to this report, if any, are uncontrolled and are for general reference only. Verify limits with current MM effective for this engine and or aircraft.

SIGNATURE Craig Grave A&P 3107192 IA


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767 jt9d boroscope

Documents

small discrepancies

aim page

th stage

small dent

stage fan blades

small nicks

area e

blend iaw