Detailed Inspection (Endoscope) of the Aft Engine Mount Pins [IAE]

TASK 71-22-11-200-804-A
Detailed Inspection (Endoscope) of the Aft Engine Mount Pins

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400

1. Reason for the Job
Refer to the MPD TASK: 712213-02
SPECIAL DETAILED INSPECTION (ENDOSCOPE) OF AFT ENGINE MOUNT PINS
This TASK gives the data for a detailed inspection of the aft engine mount pins.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	BORESCOPE - FLEXIBLE
No specific	1	MAGNIFYING GLASS POWER 10X
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V10-078)	anti-seize compound

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-11-50-100-802-A	Local Swab or Wipe Cleaning with Solvent
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-22-11-000-010-A	Removal of the Aft Engine Mount
TASK 71-22-11-400-010-A	Installation of the Aft Engine Mount
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Aft Engine Mount - Shear Pin

3. Job Set-up
Subtask 71-22-11-941-060-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 71-22-11-010-077-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in to position.

Subtask 71-22-11-040-061-A ** ON A/C NOT FOR ALL

C. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 71-22-11-010-078-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 71-22-11-110-057-A ** ON A/C NOT FOR ALL

E. Clean the aft engine mount
(1) Clean the aft engine mount (Ref. AMM TASK 70-11-50-100-802).

4. Procedure
Subtask 71-22-11-220-051-A ** ON A/C NOT FOR ALL

A. Visually Examine the Thrust-Link Shear-Pin Assemblies for Cracks

Aft Engine Mount - Shear Pin ** ON A/C NOT FOR ALL

(1) Remove the nuts (10) and (17), washers (6), (9), (14) and (16) and bolts (5) and (13) that attach the retainer plates (7) and (15) at each shear pin assembly.
(2) Push out the inner pins (3) and (12) from the outer pins (8) and (11). If the inner pins (3) and (12) cannot be removed, replace the aft engine mount.
(3) Visually examine the inner pins (3) and (12) for cracks and corrosion. Do a detailed inspection of the inner pins (3) and (12) with the MAGNIFYING GLASS POWER 10X. If there is pitting or reduction in the cross-sectional area of the inner pins (3) and (12), replace them.
(4) Use the BORESCOPE - FLEXIBLE to visually examine the inner side of the outer pins (8) and (11) for cracks and corrosion. If there is pitting or reduction in the cross-sectional area of the outer pins (8) and (11), remove and replace the outer pins (8) and (11) (Ref. AMM TASK 71-22-11-000-010) (Ref. AMM TASK 71-22-11-400-010).
(5) No cracks are allowed. If you find cracks, remove and replace the mount (Ref. AMM TASK 71-22-11-000-010) (Ref. AMM TASK 71-22-11-400-010).
(6) Discard the damaged pin and sleeve.
(7) Do not discard the aft engine mount.
(a) Remove the aft engine mount (Ref. AMM TASK 71-22-11-000-010).
(b) Send the aft engine mount to the shop.
(c) Install the serviceable aft engine mount (Ref. AMM TASK 71-22-11-400-010).
(8) Apply the anti-seize compound (Material No.V10-078) on the inner pins (3) and (12).
(9) Install the inner pins (3) and (12) in the outer pins (8) and (11).
(10) Install the retainer plates (7) and (15), with the bolts (5) and (13), washers (6), (9), (14) and (16) and nuts (10) and (17).
(11) TORQUE the nuts (10) and (17) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(12) Do steps (1) thru (10) again for each shear pin assembly.

5. Close-up
Subtask 71-22-11-410-078-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 71-22-11-440-059-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 71-22-11-410-079-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 02:30:33 UTC