Removal of the Pylon TRAS Monitoring Harness [PW11]

TASK 78-31-61-000-813-A
Removal of the Pylon TRAS Monitoring 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.

FIN: 4130KS ** 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
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
Pylon TRAS Monitoring Harness

3. Job Set-up
Subtask 78-31-61-941-079-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 78-31-61-865-055-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 78-31-61-010-100-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 78-31-61-040-075-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).

4. Procedure
Subtask 78-31-61-020-062-A ** ON A/C NOT FOR ALL

A. Removal of the Pylon TRAS Monitoring Harness

CAUTION: USE PLIERS THAT HAVE TEFLON JAWS TO TIGHTEN THE ELECTRICAL CONNECTORS. DO NOT USE PLIERS THAT HAVE METAL JAWS. METAL JAWS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS.

(1) Remove the pylon TRAS monitoring harness (1).
(a) Disconnect the pylon TRAS monitoring harness (1) connectors (4052VC-A) and (4053VC-A) from the left TRAS monitoring harness with PLIERS - CONNECTOR, JAW, SOFT.
(b) Remove the pylon TRAS monitoring harness (1) from the frame (2) and insert (3).

NOTE: Do not remove the pylon TRAS track lock harness from the frame and insert.

(c) Disconnect the pylon TRAS monitoring harness (1) connectors (4054VC-A) and (4055VC-A) from the right TRAS monitoring harness with PLIERS - CONNECTOR, JAW, SOFT.
(d) Remove the pylon TRAS monitoring harness (1) from the frame (4) and insert (5).

NOTE: Do not remove the pylon TRAS track lock harness from the frame and insert.

(e) Remove the four bolts (9) and the four washers (8) that attach the two frames (6) to the rear ramp bracket. Remove the pylon TRAS monitoring harness (1) from the two inserts (7).

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

(f) Remove the two screws (12) and the two washers (11) that attach the two clamps (10) and the pylon TRAS monitoring harness (1) to the pylon brackets. Attach the two track lock clamps and the pylon TRAS track lock harness back to the pylon brackets with the two screws (12) and the two washers (11). Tighten the two screws (12) finger-tight.

NOTE: Do not remove the clamps from the pylon TRAS track lock harness.

1 Remove the two clamps (10) from the pylon TRAS monitoring harness (1).
(g) Remove the screw (14) and washer (13) that attach the clamp (15) and the pylon TRAS monitoring harness (1) to the pylon bracket.
1 Remove the clamp (15) from the pylon TRAS monitoring harness (1).
(h) Remove the screw (16) and washer (17) that attach the clamp (18) and the pylon TRAS monitoring harness (1) to the pylon bracket.
1 Remove the clamp (18) from the pylon TRAS monitoring harness (1).
(i) Disconnect the pylon TRAS monitoring harness (1) connector (445VC-A) from the pylon interface with PLIERS - CONNECTOR, JAW, SOFT.
(j) Disconnect the harnesses (4089KS) and (4093KS) from the pylon TRAS monitoring harness (1) connectors (491VC) and (494VC) with PLIERS - CONNECTOR, JAW, SOFT.
(k) Remove the eight bolts (19) and the eight washers (20) that attach the pylon TRAS monitoring harness (1) to the pylon TRAS harness disconnect bracket.
(l) Remove the pylon TRAS monitoring harness (1) from the two spring clips on the rear ramp bracket.
(m) Remove the pylon TRAS monitoring harness (1) from the engine.
(2) Installation of the 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 03:31:39 UTC