Installation of the Forward Mount Bolt (One at a time) [PW11]

TASK 71-21-41-400-807-A
Installation of the Forward 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.

ZONE: 400

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	Torque wrench: range to between 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in )
No specific	Torque wrench: range to between 57.2 and 46.8 m.daN (421.83 and 345.13 lbf.ft )
98D71203013000	1	TORQUE WRENCH SET PW

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.360200)	MOLYKOTE G-RAPID PLUS PASTE

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	SCREW	EIPC 71-21-86-03-010
5	SCREW	EIPC 71-21-86-03-020
9	BOLT	EIPC 71-21-86-03-030
10	WASHER	EIPC 71-21-86-03-040
3	WASHER	EIPC 71-21-86-03-040
2	NUT	EIPC 71-21-86-03-050
8	LOCKING PLATE	EIPC 71-21-86-03-060
11	RETAINER	EIPC 71-21-86-03-070
4	RETAINER BRACKETS	EIPC 71-21-86-03-090
1	RETAINER	EIPC 71-21-86-03-100

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
Forward Mount Bolt

3. Job Set-up
Subtask 71-21-41-941-067-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 71-21-41-010-093-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (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) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 71-21-41-040-067-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System 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) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 71-21-41-010-094-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (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 71-21-41-420-061-A ** ON A/C NOT FOR ALL

A. Installation of the Forward Engine Mount Bolts (One at a time)

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

(1) Install the new EIPC 71-21-86-03-030 BOLT (9), new EIPC 71-21-86-03-040 WASHER (10), new EIPC 71-21-86-03-050 NUT (2) and new EIPC 71-21-86-03-040 WASHER (3).
(2) Apply MOLYKOTE G-RAPID PLUS PASTE (Material No.360200) :

Below the screws heads
On the screws and nuts threads
On the two faces of the washers.

(3) Apply the torque to the forward mount bolts.

CAUTION: MAKE SURE THAT THE PROTRUSION OF THE BOLT ABOVE THE NUT IS EQUAL TO OR MORE THAN THE DIMENSION OF THE BOLT THREAD CHAMFER. IF THE PROTRUSION IS NOT SUFFICIENT, THERE IS A RISK THAT THE BOLT WILL NOT BE CORRECTLY INSTALLED.

(a) TORQUE the forward mount bolts (9) with 98D71203013000 TORQUE WRENCH SET PW to between 57.2 and 46.8 m.daN (421.83 and 345.13 lbf.ft )

.
(4) Install the EIPC 71-21-86-03-100 RETAINER (1) and attach it to the EIPC 71-21-86-03-090 RETAINER BRACKETS (4) with the EIPC 71-21-86-03-020 SCREW (5).
(5) TORQUE the screw (5) to between 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in )

.
(6) Install the Locking Plate system of the forward Engine Mount.
(a) Install the EIPC 71-21-86-03-060 LOCKING PLATE (8) and attach it to the EIPC 71-21-86-03-070 RETAINER (11) with the EIPC 71-21-86-03-010 SCREW (7).
(b) TORQUE the screws (7) to between 0.47 and 0.37 m.daN (41.59 and 32.74 lbf.in )

5. Close-up
Subtask 71-21-41-410-081-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 71-21-41-440-061-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 71-21-41-410-082-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 12:57:32 UTC