Removal of the TRAS Actuator Proximity-Sensors [PW11]

TASK 78-31-20-000-801-A
Removal of the TRAS Actuator 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: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

WARNING: DO NOT DO WORK ON THE ENGINES DURING THIS PROCEDURE FOR 5 MINUTES MIN AFTER THE END OF THIS PROCEDURE. THE FADEC IS ENERGIZED DURING THIS TIME AND THERE IS A RISK OF INJURY AND/OR DAMAGE.

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: 4032KS ** ON A/C NOT FOR ALL
FIN: 4033KS ** ON A/C NOT FOR ALL
FIN: 4034KS ** ON A/C NOT FOR ALL
FIN: 4035KS ** ON A/C NOT FOR ALL
FIN: 4040KS ** ON A/C NOT FOR ALL
FIN: 4041KS ** ON A/C NOT FOR ALL
FIN: 4042KS ** ON A/C NOT FOR ALL
FIN: 4043KS ** 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	AR	COVER - PROTECTION
A708405	1	PROX SENSOR R/I TOOL

B. 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

C. 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
TASK 78-31-62-000-801-A	Removal of the Left TRAS Track Lock Harness
TASK 78-31-62-000-802-A	Removal of the Right TRAS Track Lock Harness
TRAS Actuator Proximity Sensors
TRAS Actuator Proximity Sensors - Tab Washer Installation

3. Job Set-up
Subtask 78-31-20-941-050-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 78-31-20-010-050-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.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-31-20-040-050-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-20-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the TRAS Feedback Locking Actuator Proximity Sensors

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

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.

(1) Remove the TRAS feedback-locking-actuator proximity-sensors as follows:

NOTE: These procedures are for the TRAS proximity sensors on the left thrust reverser half. The TRAS proximity sensors on the right thrust reverser half are opposite.

(a) Disconnect the electrical connectors of the TRAS monitoring harness from the proximity sensors (6) (Ref. AMM TASK 78-31-62-000-801) and (Ref. AMM TASK 78-31-62-000-802).

NOTE: For the left thrust reverser half, the FINs for the connectors are 4032KS-A and 4040KS-A. For the right thrust reverser half, the FINs for the connectors are 4033KS-A and 4041KS-A.

(b) Install COVER - PROTECTION on the TRAS monitoring harness connectors and feedback locking actuator connectors.
(c) Bend the anti-rotation tab washers (4) so that they do not prevent the movement of the lock nuts (5).
(d) Remove the lock nuts (5), anti-rotation tabs washers (4) and proximity sensors (6) from the feedback locking actuator with the A708405 PROX SENSOR R/I TOOL.
(e) Discard the anti-rotation tab washers (4).
(2) Remove the TRAS locking-actuator proximity-sensors as follows:

NOTE: These procedures are for the TRAS proximity sensors on the left thrust reverser half. The TRAS proximity sensors on the right thrust reverser half are opposite.

(a) Disconnect the electrical connectors of the TRAS monitoring harness from the proximity sensors (3) (Ref. AMM TASK 78-31-62-000-801) and (Ref. AMM TASK 78-31-62-000-802).

NOTE: For the left thrust reverser half, the FINs for the connectors are 4034KS-A and 4042KS-A. For the right thrust reverser half, the FINs for the connectors are 4035KS-A and 4043KS-A.

(b) Install COVER - PROTECTION on the TRAS monitoring harness connectors and locking actuator connectors.
(c) Bend the anti-rotation tab washers (2) so that they do not prevent the movement of the lock nuts (1).
(d) If necessary, rotate the manual lock drive on the locking actuator to get access to the lock nuts (1).
(e) Remove the lock nuts (1), anti-rotation tabs (2) and proximity sensors (3) from the locking actuator with the A708405 PROX SENSOR R/I TOOL.
(f) Discard the anti-rotation tab washers (2).
(3) Installation of protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 03:31:22 UTC