Inspection of the Forward Engine Mount System [CFML]

TASK 71-21-11-200-802-A
Inspection of the Forward Engine Mount System

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

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

NOTE: In this task the forward engine mounts are removed from the pylon and installed 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)
No specific	1	FLASHLIGHT - HIGHPOWER
No specific	1	MIRROR - INSPECTION
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14SBA1)	Textile-Lint free Cotton -

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. 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
CMM 712001
Inspection of the Forward Engine Mount Assembly

3. Job Set-up
Subtask 71-21-11-941-065-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 71-21-11-010-086-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) in position.

Subtask 71-21-11-040-066-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 71-21-11-010-087-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 71-21-11-210-060-A

A. Detailed Visual Inspection of the Forward Engine Mount Assembly

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

(1) If damage is found, refer to CMM 712001 for the damage limits and the repair procedure.
(2) Clean any dirt or unwanted material from the forward engine mount with Textile-Lint free Cotton - (Material No.14SBA1) .
(3) Do the visual inspection of the forward-beam assy (7) for:

Cracks
Damages
Scratches
Corrosion.

(4) Do the visual inspection of the forward-mount yoke (2) for:

Cracks
Damages
Scratches
Corrosion.

(5) Do the visual inspection of the both thrust links (4) for:

Cracks
Damages
Scratches
Corrosion.

(6) Do the visual inspection of the forward-mount shackle assy (6) for:

Cracks
Damages
Scratches
Corrosion.

(7) Do the visual inspection of the snout radius (8) for:

Cracks
Damages
Scratches
Corrosion.

(8) Do the visual inspection of the thrust link bolts (3) and (5) for:

Cracks
Damages
Scratches
Corrosion
Good installation (no play permitted).

NOTE: Take care of pins and screws positions:

For the thrust link bolts (5) the pin and screw shall be installed on engine side.
For the thrust link bolts (3) the pin and screw shall be installed on yoke side.
Presence and good condition of the cotter pin.

(9) Do the visual inspection of the fail-safe pin (9) for:

Cracks
Damages
Scratches
Corrosion
Good installation (no play permitted).

NOTE: The screw must be installed from right to left.

Presence and good condition of the cotter pin.

(10) Do the visual inspection of the forward-mount pylon bolt (1) and their retainers for:

Cracks
Damages
Scratches
Corrosion
Good installation (no play permitted).

5. Close-up
Subtask 71-21-11-410-079-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 71-21-11-440-060-A

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

Subtask 71-21-11-410-080-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] 2026.04.01 02:35:49 UTC