Installation of the TRAS Track Lock Proximity Sensors [PW11]

TASK 78-37-20-400-801-A
Installation of the TRAS Track Lock Proximity Sensors

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.

ZONE: 400
FIN: 4038KS ** ON A/C NOT FOR ALL
FIN: 4039KS ** ON A/C NOT FOR ALL
FIN: 4046KS ** ON A/C NOT FOR ALL
FIN: 4047KS ** 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	PLIERS - JAWED, SOFT
No specific	Torque wrench: range to between 46.73 and 38.24 lbf.in (0.53 and 0.43 m.daN )
No specific	Torque wrench: range to between 125.59 and 102.75 lbf.in (1.42 and 1.16 m.daN )
A708405	1	PROX SENSOR R/I TOOL

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU5-0007)	anti-seize compound zinc dust petrolatum

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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	LOCK NUTS	EIPC 78-00-00-00-000
2	ANTI-ROTATION TAB WASHERS	EIPC 78-00-00-00-000

E. 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)
TASK 78-32-38-000-801-A	Removal of the Track Lock Cover
TASK 78-32-38-400-801-A	Installation of the Track Lock Cover
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
TRAS Track Lock Proximity Sensors

3. Job Set-up
Subtask 78-37-20-941-051-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 78-37-20-010-052-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 78-37-20-040-051-A ** ON A/C NOT FOR ALL

C. 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 78-37-20-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
(2) Make sure that the track lock cover is removed (Ref. AMM TASK 78-32-38-000-801).

4. Procedure

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

Subtask 78-37-20-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Thrust Reverser Actuation System (TRAS) Lock Proximity Sensors

NOTE: These procedures are for the left hand (LH) TRAS track lock proximity sensors on one engine. The right hand (RH) side on the same engine is opposite.

(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 to prevent damage to the engine.
(2) Apply material as follow:

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

(a) Apply anti-seize compound zinc dust petrolatum (Material No.PU5-0007) to the threads of the two proximity sensors (4), the mating surfaces of the two new anti-rotation tab washers (2) and two lock nuts (1).
(3) Attach the two track lock proximity sensors (4) to the proximity sensor plate (3) with the two new EIPC 78-00-00-00-000 ANTI-ROTATION TAB WASHERS (2) and two EIPC 78-00-00-00-000 LOCK NUTS (1).
(4) Hold the proximity sensors (4) with the A708405 PROX SENSOR R/I TOOL.
(a) TORQUE the lock nuts (1) to between 125.59 and 102.75 lbf.in (1.42 and 1.16 m.daN )

.
(5) Bend the anti-rotation tab washers (2) until they prevent the movement of the lock nut (1).
(6) Install the proximity sensor plate (3) and the proximity sensors (4) on the track lock. Use the three screws (5).
(7) TORQUE the screws (5) to between 46.73 and 38.24 lbf.in (0.53 and 0.43 m.daN )

.
(a) Make sure there is a minimum breakout torque of 1.95 lbf.in (0.02 m.daN) before you apply the specified torque.
(8) Connection of electrical connector

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

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) Connect the 4038KS-A (4039KS-A) connector on the TRAS monitoring harness to the track lock proximity sensor (4).
1 Tighten connector with your fingers. Then, tighten the connector 1/8 to 1/4 turn more with PLIERS - JAWED, SOFT.
(b) Connect the 4046KS-A (4047KS-A) connector on the TRAS monitoring harness to the track lock proximity sensor (4).
1 Tighten connector with your fingers. Then, tighten the connector 1/8 to 1/4 turn more with PLIERS - JAWED, SOFT.

Subtask 78-37-20-420-051-A ** ON A/C NOT FOR ALL

B. Installation of the Track Lock Cover
(1) Install the track lock cover (Ref. AMM TASK 78-32-38-400-801).

5. Close-up
Subtask 78-37-20-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 78-37-20-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 78-37-20-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) 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
(2) Remove the WARNING NOTICE(S).
(3) 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 78-37-20-710-051-A ** ON A/C NOT FOR ALL

D. Do the operational test of the thrust reverser with the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 78-31-00-710-805).

[Rev.10 from 2021] 2026.04.01 03:34:21 UTC