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

TASK 71-21-12-000-001-A
Removal 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 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
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 71-00-20-000-802-A	Unload the Power Plant
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 Thrust Links and Crossbeam Assembly
Installation of Thrust links Replacement Tool
Forward engine-mount thrust-links

3. Job Set-up
Subtask 71-21-12-941-053-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 71-21-12-010-056-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 71-21-12-040-053-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 71-21-12-010-057-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 a ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

Subtask 71-21-12-480-050-A ** ON A/C NOT FOR ALL

E. Install the 98D71203005000 RODS-FWD ENG MOUNT.

Forward Engine Mount Thrust Links and Crossbeam Assembly ** ON A/C NOT FOR ALL

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

NOTE: You can install this tool on the right side of the engine only. You can remove the two forward engine mount links with this tool.

NOTE: It is permitted to do (Ref. AMM TASK 71-00-20-000-802), as an alternative to step 3.E.(1) thru (3).

(1) Install the aft rod end fitting of the 98D71203005000 RODS-FWD ENG MOUNT above the pylon fitting of the Thrust Reverser cowl opening actuator.
(a) Install the washer (37) and the nut (36).
(b) TORQUE the nut (36).
(2) Install the forward rod end fitting on the V-groove of the engine inner flange.
(a) Remove the screw (44).
(b) Disassemble the V-groove plate (42) from the assembly.
(c) Loosen the screws (43) which attach the plates (40) and (41) together.
(d) Install temporarily the plates (40) and (41) on the engine inner flange, between 12 and 1 o'clock.
(e) Tighten the screws (43) with your hand.
(f) Install the forward edge of the plate (42) in the V-groove of the inner flange and put it on the plate assembly (40) and (41).
(g) Tighten the screws (44) and (45)with your hand.
(3) Install the rod (34).
(a) Connect the rod (34) to the aft rod end fitting (35).
(b) Install the pip pin (38).
(c) Connect the forward end of the rod (34) to the forward fitting assembly (40), (41) and (42).

NOTE: Turn the rod at its knurled part to adjust the rod length if necessary.

(d) Install the pip pin (46).
(e) Put the forward fitting assembly of the 98D71203005000 RODS-FWD ENG MOUNT in position and make sure there is a clearance with the adjacent engine hardware. Move the forward fitting clockwise if necessary.
(f) TORQUE the screws (43), (44) and (45).

NOTE: Make sure that the thrust link that you must remove can move freely axially. Turn the rod to release the tension if necessary.

4. Procedure
Subtask 71-21-12-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the forward engine-mount thrust-link:

Forward engine-mount thrust-links ** ON A/C NOT FOR ALL

NOTE: The removal procedure is the same for the two forward engine-mount thrust-links (30).

(1) Remove the forward engine-mount thrust-link (30) from the engine brackets.

NOTE: The removal of the hardware that attaches the forward engine-mount thrust-link (30) to the engine brackets is the same at the two locations.

(a) Remove the upper bolts (5), washers (3) and (4), nuts (2), pin (7) and retainer (6) that attach the forward engine-mount thrust-link (30) to the bracket.

NOTE: It is not necessary to remove the lower bolts, washers and nuts assembly to remove the pin (7).

(b) Disengage the forward engine-mount thrust-link (30) from the engine bracket.
(2) Remove the forward engine-mount thrust-link (30) from the cross beam assembly (24).

NOTE: The removal of the hardware that attaches the forward engine-mount thrust-links (30) to the cross beam assembly is the same at the two locations.

(a) Remove the nuts (15), washers (17) and (16), bolts (18) and retainers (14) and (19).
(b) Remove the pin (25).
(c) Remove the forward engine-mount thrust-link (30) from the cross beam assembly (24).

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