Removal of the Fan Cowl Latch Proximity Sensor Harness [PW11]

TASK 71-13-61-000-801-A
Removal of the Fan Cowl Latch Proximity Sensor 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: 4146KS ** 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	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 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
Fan Cowl Latch Proximity Sensor Harness

3. Job Set-up
Subtask 71-13-61-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 71-13-61-010-050-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 an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 71-13-61-865-050-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/LATCH DOORS & SLATS/ENG2	93KS2	P40
121VU	ENGINE/LATCH DOORS & SLATS/ENG1	93KS1	P39

4. Procedure

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

Subtask 71-13-61-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Fan Cowl Latch Proximity Sensor Harness

CONFIGURATION 1

(1) Remove the fan cowl latch proximity sensor harness (3).
(a) Disconnect the pylon harness connector (4056VC-A) from the proximity sensor harness (3) connector (4056VC).
(b) Remove the four screws (2) and four washers (1) that attach the proximity sensor harness (3) connector (4056VC) to the disconnect bracket.
(c) Remove the proximity sensor harness (3) connector (4056VC) from the disconnect bracket.
(d) Disconnect the proximity sensor harness (3) connectors (4233KS-A), (4232KS-A) and (4231KS-A) from the proximity sensors on the fan cowl latches.
(e) Remove the bolt (5) that attaches the clamp (6) and the proximity sensor harness (3) to the fan cowl door.
(f) Remove the 16 bolts (5) that attach the 16 clamps (4) and the proximity sensor harness (3) to the fan cowl door.
(g) Remove the proximity sensor harness (3) and the clamps (4) and (6) from the fan cowl door.
(h) Remove the clamps (4) and (6) from the proximity sensor harness (3).

CONFIGURATION 2

(2) Remove the fan cowl latch proximity sensor harness (7).
(a) Disconnect the pylon harness connector (4056VC-A) from the proximity sensor harness (7) connector (4056VC).
(b) Remove the four screws (2) and four washers (1) that attach the proximity sensor harness (7) connector (4056VC) to the disconnect bracket.
(c) Remove the proximity sensor harness (7) connector (4056VC) from the disconnect bracket.
(d) Disconnect the proximity sensor harness (7) connectors (4233KS-A), (4232KS-A) and (4231KS-A) from the proximity sensors on the fan cowl latches.
(e) Remove the nut (9) and washer (10) that attach the clamp (12) and the proximity sensor harness (7) to the fan cowl door.
(f) Remove the two nuts (9) and two washers (10) that attach the two clamps (11) and the proximity sensor harness (7) to the fan cowl door.
(g) Remove the 14 nuts (9) and 14 washers (10) that attach the 14 clamps (8) and the proximity sensor harness (7) to the fan cowl door.
(h) Remove the proximity sensor harness (7) and the clamps (8), (11) and (12) from the fan cowl door.
(i) Remove the clamps (8), (11) and (12) from the proximity sensor harness (7).
(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 12:57:26 UTC