Detailed Inspection of Forward Engine Mount and Secondary Load Path Clearance, Fail-Safe Pin [PW11]

TASK 71-21-41-220-805-A
Detailed Inspection of Forward Engine Mount and Secondary Load Path Clearance, Fail-Safe Pin

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

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: 712122-01
DETAILED INSPECTION OF FORWARD ENGINE MOUNT AND SECONDARY LOAD PATH CLEARANCE, FAIL SAFE PIN.

NOTE: In this task the forward engine mounts are installed on the pylon and on the engine.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	FLASHLIGHT - HIGHPOWER
No specific	AR	MIRROR - INSPECTION
No specific	Torque wrench: range to between 4.63 and 3.87 m.daN (34.14 and 28.54 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	wipe, lint-free

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
7	PIN	AIPC 71-21-86-01-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Detailed Inspection of the Forward Engine Mount and Secondary Load Path Clearance, Fail-Safe Pin

3. Job Set-up
Subtask 71-21-41-941-060-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 71-21-41-010-079-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-21-41-040-060-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 71-21-41-010-080-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.

4. Procedure
Subtask 71-21-41-220-051-A ** ON A/C NOT FOR ALL

CAUTION: FOR EACH WASHER, MAKE SURE THAT YOU INSTALL THE CORRECT PART NUMBER AT THE CORRECT LOCATION. IF YOU DO NOT OBEY THIS INSTRUCTION, THE PIN CAN MOVE OUT FROM ITS POSITION.

A. Detailed Inspection of the Forward Engine Mount and Secondary Load Path Clearance, Fail-Safe Pin

NOTE: You can use the MIRROR - INSPECTION and the FLASHLIGHT - HIGHPOWER.

(1) Get access to the forward engine mount in the 12 o'clock area (engine junction area).
(2) Clean any dirt or unwanted material from the forward engine mount with the P05-005wipe, lint-free.
(3) Do the detailed inspection of the thrust links (2), forward main beam (4), yoke (3) and pylon bolts (1) for a broken element, dents, scratches, nicks or corrosion.
(a) If you find a broken element, dents, scratches, nicks or corrosion, contact Airbus for disposition.
(4) Move the two thrust links (2) to make sure that there is no jamming between the thrust links (2) and the yoke (3).
(5) Do the detailed inspection of the secondary load path clearance:
(a) Make sure that the bolt assembly (5) rotates freely.
1 If the bolt assembly (5) does not rotates freely, contact Airbus for instruction.
2 If the bolt assembly (5) rotates freely, inspect the fail safe pin (11).

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

a Remove and discard the cotter pin (7).
b Remove the nut (8), the two washers (10), the screw (9) and the fail safe pin (11).
c Do the visual inspection of the fail safe pin (11):

If you find damage, contact Airbus for instruction.

d Install the fail safe pin (11), the two washers (10), the screw (9) and the nut (8):

The screw (9) must be installed from right to left.
TORQUE the nut (8) to between 4.63 and 3.87 m.daN (34.14 and 28.54 lbf.ft ) .

WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.

e Install the new AIPC 71-21-86-01-010 PIN (7).
f Make sure that the two washers (10) cover fully the shoulder of the bushes.

5. Close-up
Subtask 71-21-41-410-073-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 cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.

Subtask 71-21-41-440-057-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 71-21-41-410-074-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:57:21 UTC