Removal of the Aft Mount Bolt (One at a time) [PW11]

TASK 71-22-41-000-807-A
Removal of the Aft Mount Bolt (One at a time)

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.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	FLASHLIGHT - HIGHPOWER
No specific	1	MIRROR - INSPECTION
98D71203013000	1	TORQUE WRENCH SET PW

B. Work Zones and Access Panels

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

C. 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 71-22-41-000-805-A	Removal of the Aft Mount Assembly
TASK 71-22-41-400-805-A	Installation of the Aft Mount Assembly
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Aft Mount Bolt

3. Job Set-up
Subtask 71-22-41-941-062-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 71-22-41-010-094-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 1M(3 FT) in position.

Subtask 71-22-41-040-062-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 71-22-41-010-095-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

WARNING: REMOVE THE SCREWS ONE BY ONE. DO NOT REMOVE MORE THAN ONE SCREW AT THE SAME TIME. IF YOU DO, THERE IS A RISK THAT THE ENGINE WILL FALL AND CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

Subtask 71-22-41-020-057-B ** ON A/C NOT FOR ALL

A. Removal of the Aft Engine Mount Bolts (One at a time)

NOTE: This procedure is applicable to one aft engine mount bolt.

(1) Remove the lock plate system of one aft engine mount:
(a) Remove the screw (1) that attaches the lock plate (2) to the retainer (5).
(b) Remove the lock plate (2).
(c) Visually examine the screw (1) and the lock plate (2) for indication of damage:
1 If there are scratches, marks and/or other damage, reject the parts.
(2) Remove one aft engine mount bolt:
(a) Loosen the bolt (3) to remove the remaining torque.

NOTE: Use the tool 98D71203013000 TORQUE WRENCH SET PW to loosen the bolts.

(b) Remove and discard the bolt (3), the washer (4), the nut (6) and its retainer (7).
(c) Visually examine the retainer (5) for indication of damage:
1 If there are scratches, marks and/or other damage, reject the parts.
(d) Visually examine the engine mount hole for indication of damage. If there are scratches, marks and/or other damage, remove the aft engine mount (Ref. AMM TASK 71-22-41-000-805) and (Ref. AMM TASK 71-22-41-400-805).

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

[Rev.10 from 2021] 2026.04.01 02:33:14 UTC