Installation of the Left TRAS Track Lock Harness [PW11]

TASK 78-31-62-400-801-A
Installation of the Left TRAS Track Lock Harness

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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

ZONE: 400
FIN: 4136KS ** 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	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	PLIERS - CONNECTOR, JAW, SOFT
No specific	Torque wrench: range to between 27 and 24 lbf.in (0.31 and 0.27 m.daN )
No specific	Torque wrench: range to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU4-0002)	epoxy primer, fluid resistant
(Material No.PU4-0002C)	base primer
(Material No.PU4-0002D)	base primer
(Material No.PU4-0002E)	base primer
(Material No.PU4-0004A)	curing solution, epoxy primer
(Material No.PU4-0005)	thinner
(Material No.PU4-0007)	converter
(Material No.PU4-0008)	thinner
(Material No.PU4-0009)	curing solution

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-31-00-710-805-A	Operational Test of Thrust Reverser with MCDU
TASK 78-31-00-710-805-A-01	Thrust Reverser Cycling Test (Engine Running)
Left TRAS Track Lock Harness

3. Job Set-up
Subtask 78-31-62-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 78-31-62-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENG1/REV/LOCK	1EG1	N44
** ON A/C NOT FOR ALL
121VU	ENG1/REV/LOCK	1EG1	R44
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENG2/REV/LOCK	1EG2	N45
** ON A/C NOT FOR ALL
121VU	ENG2/REV/LOCK	1EG2	R45

Subtask 78-31-62-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.

Subtask 78-31-62-040-051-A ** ON A/C NOT FOR ALL

D. 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) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 78-31-62-010-055-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Get access to the TRAS track-lock harness on the forward frame of the thrust reverser cowl door.

Left TRAS Track Lock Harness ** ON A/C NOT FOR ALL

4. Procedure

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

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR AND RECEPTACLE ARE CLEAN WHEN YOU CONNECT THEM. DIRTY CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

CAUTION: USE PLIERS THAT HAVE TEFLON JAWS TO TIGHTEN THE ELECTRICAL CONNECTORS. DO NOT USE PLIERS THAT HAVE METAL JAWS. METAL JAWS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS.

Subtask 78-31-62-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Left TRAS Track-Lock-Harness (3)

NOTE: You can use base primer (Material No.PU4-0002C) or base primer (Material No.PU4-0002D) with curing solution (Material No.PU4-0009) or base primer (Material No.PU4-0002E) with converter (Material No.PU4-0007) as an alternative to PU4-0002epoxy primer, fluid resistant.

(1) Removal of the protection covers:

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION and CAP - PROTECTION to prevent damage to the engine.
(2) Mix the PU4-0002epoxy primer, fluid resistant, PU4-0004Acuring solution, epoxy primer and the thinner (Material No.PU4-0005) . Refer to the instructions of manufacturer.

NOTE: You can use thinner (Material No.PU4-0008) as an alternative to thinner (Material No.PU4-0005) .

(3) Attach the left TRAS track-lock-harness (3) (4050VC) to the torque-box disconnect panel. Use the four screws (1) and the four washers (2). Wet install the bolt (19) with the PU4-0002epoxy primer, fluid resistant mixture.
(a) Tighten the screws (1) with your hand. Then tighten the screws (1) 1/8 to 1/4 of a turn more.
(4) Connect the pylon TRAS track-lock-harness (4050VC-A) to the left TRAS track-lock-harness (3) (4050VC) with the PLIERS - CONNECTOR, JAW, SOFT.
(a) Turn the connector finger-tight. Turn the connector 1/4 turn more with PLIERS - CONNECTOR, JAW, SOFT.
(5) Put the clamp (4) on the left TRAS track-lock-harness (3).
(6) Remove the bolt (6), washer (5) and left TRAS monitoring-harness-clamp from the torque box.
(7) Clean the faying surface with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean dry lint-free cotton cloth (Material No.PU1-0001) before it becomes dry.
(8) Look at the surface of the torque box where you will install the left TRAS monitoring-harness-clamp below the clamp (4). Make sure the surface has a layer of paint and you can see no bare metal. If part of the surface is without paint, apply a layer of the PU4-0002epoxy primer, fluid resistant mixture.
(9) Attach the left TRAS track-lock-harness (3), clamp (4), left TRAS monitoring-harness and left TRAS monitoring-harness-clamp on the torque box with the bolt (6) and the washer (5). Put the clamp (4) on top of the left TRAS monitoring-harness-clamp. Wet install the bolts (6) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the bolt (6) at this time.

(10) Put the two clamps (7) on the left TRAS track-lock-harness (3).
(11) Remove the two bolts (8), two washers (9) and two left TRAS monitoring-harness-clamps from the torque box.
(12) Clean the faying surface with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean dry lint-free cotton cloth (Material No.PU1-0001) before it becomes dry.
(13) Look at the surfaces of the torque box where you will install the left TRAS monitoring-harness-clamps below the clamps (7). Make sure the surfaces have a layer of paint and you can see no bare metal. If part of a surface is without paint, apply a layer of the PU4-0002epoxy primer, fluid resistant mixture.
(14) Attach the left TRAS track-lock-harness (3), two clamps (7), left TRAS monitoring-harness and two left TRAS monitoring-harness-clamps on the torque box with the two bolts (8) and two washers (9). Put the two clamps (7) on top of the two left TRAS monitoring-harness-clamps. Wet install the bolts (8) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the bolts (8) at this time.

(15) Put the six clamps (12) on the left TRAS track-lock-harness (3).
(16) Remove the six bolts (10), six washers (11) and the six left TRAS monitoring-harness-clamps from the torque box.
(17) Attach the left TRAS track-lock-harness (3), six clamps (12), left TRAS monitoring-harness and six left TRAS monitoring-harness-clamps on the torque box with the six bolts (10) and the six washers (11). Put the six clamps (12) on top of the six left TRAS monitoring-harness-clamps. Wet install the bolt (19) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the bolts (10) at this time.

(18) Put the four clamps (15) on the left TRAS track-lock-harness (3).
(19) Remove the four nuts (13) and the eight washers (14) that attach the four left TRAS monitoring-harness-clamps, left TRAS monitoring-harness and four supports to the torque box.
(20) Attach the left TRAS track-lock-harness (3), four clamps (15), left TRAS monitoring-harness, four left TRAS monitoring-harness-clamps and four supports on the torque box with the four nuts (13) and the eight washers (14). Put the four left TRAS monitoring-harness-clamps on top of the four clamps (15). Wet install the nuts (13) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the nuts (13) at this time.

(21) Put the clamp (16) on the left TRAS track-lock-harness (3).
(22) Remove the bolt (18), washer (17) and left TRAS monitoring-harness-clamp from the torque box.
(23) Clean the faying surface with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean dry lint-free cotton cloth (Material No.PU1-0001) before it becomes dry.
(24) Look at the surface of the torque box where you will install the clamp (16). Make sure the surface has a layer of paint and you can see no bare metal. If part of the surface is without paint, apply a layer of the PU4-0002epoxy primer, fluid resistant mixture.
(25) Attach the left TRAS track-lock-harness (3), clamp (16), left TRAS monitoring-harness and left TRAS monitoring harness clamp on the torque box with the bolt (18) and the washer (17). Put the left TRAS monitoring-harness-clamp on top of the clamp (16). Wet install the bolt (18) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the bolt (18) at this time.

(26) Put the clamp (21) on the left TRAS track-lock-harness (3).
(27) Remove the bolt (19), washer (20) and the left TRAS monitoring-harness-clamp from the torque box.
(28) Clean the faying surface with a clean lint-free cotton cloth (Material No.PU1-0001) made moist with PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean dry lint-free cotton cloth (Material No.PU1-0001) before it becomes dry.
(29) Look at the surface of the torque box where you will install the left TRAS monitoring-harness-clamp below the clamp (19). Make sure the surface has a layer of paint and you can see no bare metal. If part of the surface is without paint, apply a layer of the PU4-0002epoxy primer, fluid resistant mixture.
(30) Attach the left TRAS track lock harness (3), clamp (21), left TRAS monitoring harness and left TRAS monitoring harness clamp on the torque box with the bolt (19) and the washer (20). Put the clamp (21) on top of the left TRAS monitoring-harness-clamp. Wet install the bolt (19) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the bolt (19) at this time.

(31) Put the clamp (22) on the left TRAS track-lock-harness (3).
(32) Remove the bolt (24), washer (23) and the left TRAS monitoring-harness-clamp from the torque box.
(33) Attach the left TRAS track lock harness (3), clamp (22), left TRAS monitoring-harness and left TRAS monitoring harness clamp on the torque box with the bolt (24) and the washer (23). Put the left TRAS-monitoring-harness clamp on top of the clamp (22). Wet install the bolt (24) with the PU4-0002epoxy primer, fluid resistant mixture.

NOTE: Do not torque the bolt (24) at this time.

(34) Connect the left TRAS track-lock-harness (3) (4141KS-A) to the track lock valve.
(a) Turn the connector finger-tight. Turn the connector 1/4 turn more with PLIERS - CONNECTOR, JAW, SOFT.
(35) Connect the left TRAS track-lock-harness (3) terminal lug to the torque box.
(a) Clean the bolt (25) and the washers (26) and (27) with a clean lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean lint-free cotton cloth (Material No.PU1-0001) before it becomes dry.
(b) Clean the mating surface of the torque box with a clean lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl. Remove the PU2-0001alcohol, isopropyl with a clean lint-free cotton cloth (Material No.PU1-0001) before it becomes dry.
(c) Attach the left TRAS track-lock-harness (3) terminal lug to the torque box with the bolt (25) and the washers (26) and (27).
(d) Measure the resistance between the left TRAS track-lock-harness (3) terminal lug and the washer (26). Make sure that it is less than 0.001 ohm. If the resistance is more than 0.001 ohm, remove the hardware and do steps 4.A.(35)(a) thru 4.A.(35)(d) again.
(e) TORQUE the bolt (25) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )

.
(36) Adjust the left TRAS track-lock-harness (3) to keep the preload to a minimum. Make sure that there are no kinks in the left TRAS track lock harness (3).
(37) Tighten the nuts and the bolts.
(a) TORQUE the bolts (6), (8), (10), (18), (19) and (24) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )

.
(b) TORQUE the nuts (13) to between 27 and 24 lbf.in (0.31 and 0.27 m.daN )

5. Close-up
Subtask 78-31-62-440-050-A ** ON A/C NOT FOR ALL

A. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-31-62-410-051-A ** ON A/C NOT FOR ALL

B. 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 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 78-31-62-865-052-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENG1/REV/LOCK	1EG1	N44
** ON A/C NOT FOR ALL
121VU	ENG1/REV/LOCK	1EG1	R44
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENG2/REV/LOCK	1EG2	N45
** ON A/C NOT FOR ALL
121VU	ENG2/REV/LOCK	1EG2	R45

Subtask 78-31-62-710-050-A ** ON A/C NOT FOR ALL

D. Test
(1) Do the operational test of the thrust reverser with the MCDU (Ref. AMM TASK 78-31-00-710-805).
(2) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)

[Rev.10 from 2021] 2026.04.01 03:31:43 UTC