Removal of the Pylon TRAS Track Lock Harness [PW11]

TASK 78-31-62-000-803-A
Removal of the Pylon 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.

ZONE: 400
FIN: 4135KS ** 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
No specific	1	PLIERS - CONNECTOR, JAW, SOFT
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

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 78-31-61-000-813-A	Removal of the Pylon TRAS Monitoring Harness
Pylon TRAS Track Lock Harness

3. Job Set-up
Subtask 78-31-62-941-054-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 78-31-62-865-056-A ** ON A/C NOT FOR ALL

B. Open, safety and tag 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 78-31-62-010-064-A ** ON A/C NOT FOR ALL

C. 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 an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-31-62-040-055-A ** ON A/C NOT FOR ALL

D. 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).

Subtask 78-31-62-010-067-A ** ON A/C NOT FOR ALL

E. Disconnection of the Pylon TRAS Monitoring Harness Connectors
(1) Disconnect the pylon TRAS monitoring harness connectors (4053VC-A) and (4052VC-A) from the left TRAS monitoring harness (Ref. AMM TASK 78-31-61-000-813).
(2) Disconnect the pylon TRAS monitoring harness connectors (4055VC-A) and (4054VC-A) from the right TRAS monitoring harness (Ref. AMM TASK 78-31-61-000-813).
(3) Installation of the protection covers

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

(a) Put COVER - PROTECTION on the electrical connectors.

4. Procedure
Subtask 78-31-62-020-054-A ** ON A/C NOT FOR ALL

A. Removal of the Pylon TRAS Track Lock Harness
(1) Remove the pylon TRAS track lock harness (1) (4135KS).
(a) Use PLIERS - CONNECTOR, JAW, SOFT to disconnect the pylon TRAS track lock harness (1) connector (4050VC-A) from the left TRAS track lock harness.
(b) Remove the pylon TRAS monitoring harness and pylon TRAS track lock harness (1) from the frame (4) and insert (2).
(c) Use PLIERS - CONNECTOR, JAW, SOFT to disconnect the pylon TRAS track lock harness (1) connector (4051VC-A) from the right TRAS track lock harness.
(d) Remove the pylon TRAS monitoring harness and TRAS track lock harness (1) from the frame (5) and insert (3).
(e) Remove the four bolts (15) and the four washers (14) that attach the two frames (12) to the rear ramp bracket. Remove the pylon TRAS track lock harness (1) from the two inserts (13).

NOTE: Do not remove the pylon TRAS monitoring harness from the frames and inserts.

(f) Remove the two screws (18) and the two washers (17) that attach the two clamps (16) and the pylon TRAS track lock harness (1) to the pylon brackets. Attach the two clamps and the pylon TRAS monitoring harness back to the pylon brackets with the two screws (18) and the two washers (17). Tighten the two screws (18) finger-tight.
(g) Remove the two clamps (16) from the pylon TRAS track lock harness (1).
(h) Use PLIERS - CONNECTOR, JAW, SOFT to disconnect the pylon TRAS track lock harness (1) connector (752VC-A) from the pylon interface.
(i) Remove the pylon TRAS track lock harness (1) from the two spring clips on the rear ramp bracket.
(j) Remove the pylon TRAS track lock harness (1) from the engine.
(2) If necessary, remove the frames (4) and (5).
(a) Remove the two bolts (6), the four washers (7) and the two nuts (8) that attach the frame (4) to the torque box bracket. Remove the frame (4).
(b) Remove the two bolts (9), the four washers (10) and the two nuts (11) that attach the frame (5) to the torque box bracket. Remove the frame (5).
(3) Installation of the protection covers

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

(a) Put COVER - PROTECTION on the electrical connectors.

[Rev.10 from 2021] 2026.04.01 03:31:46 UTC