Removal of the Thrust Reverser Harnesses - Right Upper Actuator Channel A and Channel B Harnesses [CFML]

TASK 71-51-43-000-813-A
Removal of the Thrust Reverser Harnesses - Right Upper Actuator Channel A and Channel B Harnesses

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

FIN: 4771EG
FIN: 4772EG

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 1M(3 FT)
No specific	1	CAP - PROTECTION
No specific	1	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Thrust Reverser Harnesses - Right Upper Actuator Ch A and Ch B Harnesses

3. Job Set-up
Subtask 71-51-43-941-095-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 71-51-43-010-116-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position forward of the right upper actuator.

Subtask 71-51-43-040-055-A

C. Deactivation of the Thrust Reverser System 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 nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

4. Procedure
Subtask 71-51-43-020-094-A

A. Removal of the Thrust Reverser Harnesses - Right Upper Actuator Channel A and Channel B Harnesses
(1) Open the right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806).
(2) Remove the bolt (30) to open the block clamp (29) on the support bracket (28).
(3) Remove the channel A harness (7) and the channel B harness (4) from the block clamp (29).
(4) Close the right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806).
(5) Remove the channel A harness (7) as follows:
(a) Disconnect the electrical connector (8) from the proximity sensor (10) on the upper right actuator (11) (Ref. AMM TASK 70-70-00-910-804).
(b) Disconnect the electrical connector (6) from the Linear Variable Differential Transducer (LVDT) (5) (Ref. AMM TASK 70-70-00-910-804).
(c) Disconnect the electrical connector (17) from the receptacle on the interface bracket (15) (Ref. AMM TASK 70-70-00-910-804).
(d) Remove the bolt (24) that attaches the p-clamp (25) to the support bracket (21).
(e) Remove the harness (7) from the spring clip on the support bracket (2) and remove the harness from the thrust reverser.
(6) Remove the channel B harness (4) from the thrust reverser as follows:
(a) Disconnect the electrical connector (3) from the proximity sensor (1) on the right upper actuator (11) (Ref. AMM TASK 70-70-00-910-804).
(b) Disconnect the electrical connector (16) from the receptacle on the interface bracket (15) (Ref. AMM TASK 70-70-00-910-804).
(c) Remove the bolt (23) that attaches the p-clamp (22) to the support bracket (21).
(d) Remove the channel B harness (4) from the spring clip (26) on support bracket (2).
(e) Remove the harness (4) from the thrust reverser.
(7) Install COVER - PROTECTION and CAP - PROTECTION on all open ports, open tubes, open hoses, and connectors.

[Rev.10 from 2021] 2026.04.02 06:33:30 UTC