Removal of the Forward Engine Mount Bolts One at a Time [CFMB]

TASK 71-21-11-000-045-A
Removal of the Forward Engine Mount Bolts One at a Time

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
98D27803500001	1	LOCKING TOOL ZERO POS
98D71203003000	1	RODS-FWD ENG MOUNT

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Forward Engine Mount Bolts

3. Job Set-up
Subtask 71-21-11-941-059-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Make sure that the slats are retracted and install 98D27803500001 LOCKING TOOL ZERO POS on the flap and slat control lever.
(5) Install 98D71203003000 RODS-FWD ENG MOUNT on the engine.

Subtask 71-21-11-010-064-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 71-21-11-040-056-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 71-21-11-010-065-A ** ON A/C NOT FOR ALL

D. Get Access

CAUTION: BEFORE OPENING THE THRUST REVERSER DOORS TO THE 45 DEGREES POSITION MAKE SURE THAT THE SLATS ARE RETRACTED. IF NOT THE SLATS CAN TOUCH THE INBOARD THRUST REVERSER DOOR.

(1) Open the thrust reverser doors to the 45 degrees position (Ref. AMM TASK 78-36-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(3) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(4) Put a ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine level.

4. Procedure
Subtask 71-21-11-020-061-A ** ON A/C NOT FOR ALL

A. Remove the forward engine mount bolt one at a time:
(1) Remove the bolt (100), the washers (105) and (115), the retainer (125), and the nut (110) from the engine mount (95).
(2) Cut and remove the lockwire or safety cable, remove the bolt (85), the nut (120) and the washer (90).

[Rev.10 from 2021] 2026.04.01 02:26:00 UTC