Installation of the Forward Engine Mount Thrust Links without Engine Removal [IAE]

TASK 71-21-12-400-001-A
Installation of the Forward Engine Mount Thrust Links without Engine Removal

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.

ZONE: 400
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 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
98D27803500001	1	LOCKING TOOL ZERO POS
98D71203005000	1	RODS-FWD ENG MOUNT

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 71-00-20-400-802-A	Reload the Power Plant
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing 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 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Forward engine-mount thrust-links
Installation of Thrust links Replacement Tool
Forward Engine Mount Thrust Links and Crossbeam Assembly

3. Job Set-up
Subtask 71-21-12-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
(4) Make sure that the slats are retracted and install 98D27803500001 LOCKING TOOL ZERO POS on the flap and slat control lever.
(5) Make sure that 98D71203005000 RODS-FWD ENG MOUNT is installed on the engine.

Subtask 71-21-12-010-058-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Make sure that the thrust reverser halves are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 71-21-12-040-054-A ** ON A/C NOT FOR ALL

C. Make sure that the hydraulic control unit is deactivated (Ref. AMM TASK 78-30-00-040-012).

4. Procedure
Subtask 71-21-12-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the forward engine-mount thrust-link:
(1) Install the forward engine-mount thrust-link (30) on the cross beam assembly (24):

NOTE: The installation of the hardware items that attach the forward engine-mount thrust-link (30) to the cross beam assembly (24) is the same at the two locations.

(a) Put the forward engine-mount thrust-link (30) in position on the cross beam assembly (24).
(b) Install the retainer (14) through the pin (25).
(c) Install the assembly made of pin (25) and the retainer (14) through the cross beam assembly (24).
1 The retainer (14) must be on the top of the cross beam assembly (24).
(d) Install the bolts (18), nuts (15) and washers (16) and (17) that attach the retainer (14) on the cross beam assembly (24).
(e) Install the retainer (19) with the bolts (18), nuts (15) and washers (16) and (17).
(f) TORQUE all the nuts (15) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
1 Apply torque stripes on all the nuts (15).
(2) Install the forward engine-mount thrust-link (30) on the engine bracket:
(a) Put the forward engine-mount thrust-link (30) in position on the engine bracket.
1 You must install the right upper bolt (5) and the washer (4) before you install the right (looking forward) engine-mount thrust-link (30) on the engine bracket.
(b) Install the pin (7), retainer (6), bolts (5), nuts (2) and washers (3) and (4).
(c) TORQUE all the nuts (2) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
1 Apply torque stripes on all the nuts (2).

5. Close-up
Subtask 71-21-12-080-050-A ** ON A/C NOT FOR ALL

A. Remove the 98D71203005000 RODS-FWD ENG MOUNT from the engine.

Installation of Thrust links Replacement Tool ** ON A/C NOT FOR ALL

NOTE: It is permitted to do (Ref. AMM TASK 71-00-20-400-802), as an alternative to step 5.A.(1) thru (7).

(1) Turn the rod (34) until the weight of the engine is on the forward engine mount (not the rod).
(2) Remove the pip pins (38) and (46) from the forward and aft fitting assemblies.
(3) Remove the nut (36), the washer (37) and the aft rod end fitting (35) from the pylon fitting.
(4) Loosen the screws (44) and (45).
(5) Remove the V-groove plate (42) from the forward rod end fitting.
(6) Loosen the screws (43).
(7) Remove the upper plate (41) and the lower plate (40).

Subtask 71-21-12-410-056-A ** ON A/C NOT FOR ALL

B. Close the thrust reverser cowl doors (Ref. AMM TASK 78-32-00-410-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 71-21-12-440-053-A ** ON A/C NOT FOR ALL

C. Activate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-440-012).

Subtask 71-21-12-410-057-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(3) Remove the WARNING NOTICE(S).
(4) On panel 114VU remove the locking tool from the flap and slat control lever.

[Rev.10 from 2021] 2026.04.01 02:30:11 UTC