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

TASK 71-21-12-000-010-A
Removal of the Forward Engine Mount Bolts One at a Time

FIN: 1500KM ** ON A/C NOT FOR ALL

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)
98D71203001000	1	CHEST,TORQUE SET-ENGINE R I

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 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
Forward Engine Mount Bolts

3. Job Set-up
Subtask 71-21-12-941-054-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).

Subtask 71-21-12-010-060-A ** ON A/C NOT FOR ALL

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

Subtask 71-21-12-040-055-A ** ON A/C NOT FOR ALL

C. Deactivate the Thrust Reverser.
(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 71-21-12-010-061-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(2) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(3) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(4) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

4. Procedure
Subtask 71-21-12-020-052-A ** ON A/C NOT FOR ALL

A. Remove the Center Bolt

Forward Engine Mount Bolts ** ON A/C NOT FOR ALL

(1) Cut and discard the lockwire from the center bolt (1).
(2) Remove the center bolt (1) and washer (2) with 98D71203001000 CHEST,TORQUE SET-ENGINE R I.
(3) Remove the nut (6), washer (5), retainer (4) and nut (3).

Subtask 71-21-12-020-056-A ** ON A/C NOT FOR ALL

B. Remove the Forward Engine Mount Bolts One at a Time

Forward Engine Mount Bolts ** ON A/C NOT FOR ALL

(1) Remove the nut (13), washer (12) and (8), the bolt (7) and remove the retainers (11) and (9).
(2) Remove the nut (14), retainer (10), washer (15) and the bolt (16).

[Rev.10 from 2021] 2026.04.01 12:56:27 UTC