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

TASK 71-21-11-000-804-A
Removal 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.

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	1	FLASHLIGHT - HIGHPOWER
No specific	1	MIRROR - INSPECTION
No specific	AR	WARNING NOTICE(S)

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-21-11-000-802-A	Removal of the Forward Engine Mount
TASK 71-21-11-400-802-A	Installation of the Forward Engine Mount
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
Forward Engine Mount Bolts (One at a time)

3. Job Set-up
Subtask 71-21-11-941-068-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) Put a WARNING NOTICE(S) 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 71-21-11-010-093-A

B. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-21-11-040-069-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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 71-21-11-010-094-A

D. Get Access
(1) Open the thrust reverser cowl-doors (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 71-21-11-020-070-A

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.

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

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

(1) Remove the locking plate system of one bolt of the forward engine mount (6).
(a) Remove the screw (7) that attaches the locking plate (8) to the retainer (11).
(b) Remove the locking plate (8).
(c) Visually examine the screw (7) and the locking plate (8) for indication of damage.

If there are scratches, marks and/or other damage, reject the parts.

(2) Remove one forward engine mount bolt
(a) Loosen the bolt (9) to remove the remaining torque.
(b) Remove the two screws (5) and the retainer (1).
1 Visually examine the screws (5) and the retainer (1) for indication of damage.

If there are scratches, marks and/or other damage, reject the parts.

(c) Remove the bolt (9), the washer (10), the nut (2) and the washer (3).
(d) Remove the retainers (4) and (11).
(e) Visually examine the retainers (4) and (11) for indication of damage.

If there are scratches, marks and/or other damage, reject the parts.

(f) Visually examine the engine mount hole for indication of damage.

If there are scratches, marks and/or other damage, replace the forward engine mount (Ref. AMM TASK 71-21-11-000-802) and (Ref. AMM TASK 71-21-11-400-802).

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

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