Removal of the Thrust Reverser Actuation System (TRAS) Track Lock Valve [PW11]

TASK 78-37-02-000-801-A
Removal of the Thrust Reverser Actuation System (TRAS) Track Lock Valve

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: MAKE SURE YOU DEPRESSURIZED THE HYDRAULIC SYSTEM. IF YOU LOOSEN A HYDRAULIC TUBE FITTING WHEN THERE IS PRESSURE IN THE HYDRAULIC SYSTEM, YOU CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.

FIN: 4141KS ** ON A/C NOT FOR ALL
FIN: 4142KS ** 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	CAP - BLANKING
No specific	AR	CAP - PROTECTION
No specific	1	CONTAINER 1 L (1/4 USGAL)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TRAS Track Lock Valve ** ON A/C NOT FOR ALL
TRAS Track Lock Valve ** ON A/C NOT FOR ALL
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs

3. Job Set-up
Subtask 78-37-02-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 78-37-02-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (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

Subtask 78-37-02-865-050-A ** ON A/C NOT FOR ALL

C. Open, safety and tag these circuit breakers in this sequence:

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 78-37-02-863-050-A ** ON A/C NOT FOR ALL

D. Depressurization of the Hydraulic Systems
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(a) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(b) Depressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(b) Depressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).

Subtask 78-37-02-040-050-A ** ON A/C NOT FOR ALL

E. Deactivation of the Thrust Reverser for Ground 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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 78-37-02-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Thrust-Reverser Actuation System (TRAS) Track Lock Valve (1)

NOTE: This procedure is for the TRAS track lock valve on the left thrust reverser door. The procedure for the TRAS track lock valve on the right thrust reverser door is opposite.

(1) Disconnection of the electrical connector

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR IS CLEAN BEFORE YOU DISCONNECT IT. DIRTY ELECTRICAL CONNECTORS CAN CAUSE THRUST REVERSER PROBLEMS.

CAUTION: USE TEFLON-JAWED PLIERS TO LOOSEN/TIGHTEN ELECTRICAL CONNECTORS. DO NOT USE METAL-JAWED PLIERS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ELECTRICAL CONNECTORS CAN OCCUR.

(a) Disconnect TRAS track lock harness from the TRAS track lock valve (1).

NOTE: The Functional Item Number (FIN) is 4141KS-A for the left TRAS track lock harness and 4142KS-A for the right TRAS track lock harness.

(b) Install CAP - PROTECTION on the TRAS track lock harness connector and TRAS track lock valve (1).
(2) Disconnection of the supply tube.

WARNING: YOU MUST NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. THE HYDRAULIC FLUID IS POISONOUS AND CAN BE ABSORBED INTO YOUR BODY. IF YOU ACCIDENTALLY GET HYDRAULIC FLUID IN YOUR EYES, MOUTH OR ON YOUR SKIN, FLUSH WITH WATER AND GET MEDICAL AID.

CAUTION: HYDRAULIC FLUID CAN CAUSE DAMAGE TO EQUIPMENT. IF HYDRAULIC FLUID FALLS ON A SURFACE, IMMEDIATELY CLEAN THE SURFACE WITH A CLEAN CLOTH.

(a) Put a CONTAINER 1 L (1/4 USGAL) or lint-free cotton cloth (Material No.PU1-0001) under the TRAS track lock valve (1) to collect the remaining hydraulic fluid.
(b) Disconnect the supply tube, control tube and return tube from the TRAS track lock valve (1).
(c) Install CAP - BLANKING on the supply tube, control tube, return tube and TRAS track lock valve (1).
(3) Remove the bolt (4) and washers (2) and (3) that attach the grounding strap lug and TRAS track lock valve (1) to the torque box.
(4) Remove the two bolts (6) and two washers (5) that attach the TRAS track lock valve (1) to the torque box.
(5) Remove the TRAS track lock valve (1) from the torque box.

[Rev.10 from 2021] 2026.04.01 03:34:17 UTC