Installation of the Forward Engine Mount Bolts (One at a time) [CFML]

TASK 71-21-11-400-804-A
Installation of the Forward Engine Mount Bolts (One at a time)

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: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

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

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 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 421.83 and 345.13 lbf.ft (57.19 and 46.79 m.daN )
No specific	Torque wrench: range to between 41.59 and 32.74 lbf.in (0.47 and 0.37 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03QEA1)	Dry lubricant-Anti Friction - -

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	BOLT	AIPC 71-21-86-52-010
10	WASHER	AIPC 71-21-86-52-020
3	WASHER	AIPC 71-21-86-52-020
2	NUT	AIPC 71-21-86-52-030
9	BOLT	AIPC 71-21-86-53-010
10	WASHER	AIPC 71-21-86-53-020
3	WASHER	AIPC 71-21-86-53-020
2	NUT	AIPC 71-21-86-53-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Forward Engine Mount Bolts (One at a time)

3. Job Set-up
Subtask 71-21-11-941-069-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 71-21-11-010-095-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 71-21-11-040-070-A

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 ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 71-21-11-010-096-A

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 71-21-11-420-067-A

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 retainers (4) and (11).
(2) Install the new AIPC 71-21-86-52-010 BOLT (9) or AIPC 71-21-86-53-010 BOLT (9), new AIPC 71-21-86-52-020 WASHER (10) or AIPC 71-21-86-53-020 WASHER (10), new AIPC 71-21-86-52-030 NUT (2) or AIPC 71-21-86-53-030 NUT (2) and new AIPC 71-21-86-52-020 WASHER (3) or AIPC 71-21-86-53-020 WASHER (3).

NOTE: Apply Dry lubricant-Anti Friction - - (Material No.03QEA1) :

Under the screws heads
On the screws and nuts threads
On both face of the washers.

(3) Install the retainer (1) and attach it to the retainer brackets (4) with the screw (5).
(4) TORQUE the screw (5) to between 41.59 and 32.74 lbf.in (0.47 and 0.37 m.daN )

.
(5) Torque the forward mount bolt.

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 bolt (9) to between 421.83 and 345.13 lbf.ft (57.19 and 46.79 m.daN )

.
(6) Install the locking plate system of the bolt of the forward engine mount (6).
(a) Install the locking plate (8) and attach it to the retainer (11) with the screw (7).
(b) TORQUE the screws (7) to between 41.59 and 32.74 lbf.in (0.47 and 0.37 m.daN )

5. Close-up
Subtask 71-21-11-410-086-A

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 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 71-21-11-440-063-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 71-21-11-410-087-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 07:32:11 UTC