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

TASK 78-37-02-400-801-A
Installation 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	PLIERS - NOSE, SOFT, LONG
No specific	Torque wrench: range to between 90 and 81 lbf.in (1.02 and 0.92 m.daN )
No specific	Torque wrench: range to between 190 and 170 lbf.in (2.15 and 1.92 m.daN )
No specific	Torque wrench: range to between 245 and 215 lbf.in (2.77 and 2.43 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU2-0002)	acetone
(Material No.PU6-0003)	lubricant

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 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)
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
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
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
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)

3. Job Set-up
Subtask 78-37-02-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(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 78-37-02-010-051-A ** ON A/C NOT FOR ALL

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

Subtask 78-37-02-865-051-A ** ON A/C NOT FOR ALL

C. 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 78-37-02-040-052-A ** ON A/C NOT FOR ALL

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

Subtask 78-37-02-864-050-A ** ON A/C NOT FOR ALL

E. Make sure that the hydraulic systems are depressurized
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(a) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(b) Make sure that the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001) is depressurized.
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) Make sure that the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002).
(b) Make sure that the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001) is depressurized.

4. Procedure

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

Subtask 78-37-02-420-050-A ** ON A/C NOT FOR ALL

A. Installation 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) Cleaning of the surface

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

(a) Clean the TRAS track lock valve (1), bolt (4), washers (2) and (3) and grounding strap lug.
(b) Clean the surface of the TRAS track lock valve (1) where the grounding strap lug attaches to with a clean lint-free cotton cloth (Material No.PU1-0001) and acetone (Material No.PU2-0002) or equivalent.
(c) Remove the acetone (Material No.PU2-0002) with a dry, clean lint-free cotton cloth (Material No.PU1-0001) before the solvent becomes dry.
(d) Clean the bolt (4), washers (2) and (3) and grounding strap lug with a clean lint-free cotton cloth (Material No.PU1-0001) or equivalent.
(e) Remove the acetone (Material No.PU2-0002) with a dry, clean lint-free cotton cloth (Material No.PU1-0001) before the solvent becomes dry.
(2) Attach the TRAS track lock valve (1) to the torque box with the two bolts (6) and two washers (5).
(3) TORQUE the bolts (6) to between 90 and 81 lbf.in (1.02 and 0.92 m.daN )

.
(4) Attach the TRAS track lock valve (1) and grounding strap lug to the torque box with the bolt (4) and washers (2) and (3).
(5) TORQUE the bolt (4) to between 90 and 81 lbf.in (1.02 and 0.92 m.daN )

.
(6) Make sure that the resistance between the TRAS track lock valve (1) and the grounding strap lug is 0.0100 ohms or less.
(7) If the resistance is too high, remove the bolt (4), washers (2) and (3) and grounding strap lug and do step 4.(A)(1) and steps 4.A.(4) thru 4.(A)(6) again.
(8) Remove the CAP - BLANKING from the supply tube, control tube, return tube and TRAS track lock valve (1).
(9) Apply a thin layer of lubricant (Material No.PU6-0003) or equivalent to the threads of the supply tube, control tube and return tube fittings.
(10) Connect the control tube to the TRAS track lock valve (1).
(11) TORQUE the control tube fitting to between 245 and 215 lbf.in (2.77 and 2.43 m.daN )

.
(12) Connect the return tube to the TRAS track lock valve (1).
(13) TORQUE the return tube fitting to between 190 and 170 lbf.in (2.15 and 1.92 m.daN )

.
(14) Connect the supply tube to the TRAS track lock valve (1).
(15) TORQUE the supply tube fitting to between 245 and 215 lbf.in (2.77 and 2.43 m.daN )

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

CAUTION: USE TEFLON-JAWED PLIERS TO CONNECT ELECTRICAL CONNECTORS. DO NOT USE METAL-JAWED PLIERS. DAMAGE TO THE ELECTRICAL CONNECTORS COULD OCCUR.

(16) Connection of the electrical connector

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.

(a) Remove the CAP - PROTECTION from the TRAS track lock harness and TRAS track lock valve (1).
(b) Connect the TRAS track lock harness to the TRAS track lock valve (1).
(c) Align the keyway on the connector.
(d) Tighten the connector with your fingers.
(e) Then tighten the connector 1/8 to 1/4 of a turn more with PLIERS - NOSE, SOFT, LONG.

5. Close-up
Subtask 78-37-02-440-051-A ** ON A/C NOT FOR ALL

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

Subtask 78-37-02-620-051-A ** ON A/C NOT FOR ALL

B. Pressurization of the hydraulic system
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(a) pressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(a) pressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).

Subtask 78-37-02-865-052-A ** ON A/C NOT FOR ALL

C. Remove the safety clips and tags and close 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 78-37-02-410-050-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 71-13-00-410-802):
(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).
(5) 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).

Subtask 78-37-02-870-050-A ** ON A/C NOT FOR ALL

E. Tests
(1) Do an operational test of the thrust reverser system with the MCDU (bleeding) (Ref. AMM TASK 78-31-00-710-805).
(2) Make sure that there are no leaks at the tube connections.

[Rev.10 from 2021] 2026.04.01 03:34:19 UTC