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

TASK 71-51-43-400-813-A
Installation 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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)
No specific	Torque wrench: range to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00062)	LUBRICATING OIL TURBINE ENGINE SYNT BASE

C. 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

D. 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 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-740-804-A	Thrust Reverser Cycling Test (Menu Mode)
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after 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 71-51-43-941-096-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) Make sure that the WARNING NOTICE(S) are 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 71-51-43-010-117-A

B. Get Access
(1) Make sure that the fan cowl doors are open (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) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 71-51-43-040-056-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) Make sure that you did the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

4. Procedure
Subtask 71-51-43-420-089-A

A. Installation of the Thrust Reverser Harnesses - Right Upper Actuator Channel A and Channel B Harnesses
(1) Remove COVER - PROTECTION and CAP - PROTECTION from openings, tubes, hoses, and the electrical connectors.
(2) Lubricate the threads of the bolts (23), (24), and (30) with LUBRICATING OIL TURBINE ENGINE SYNT BASE (Material No.CPNCL00062) .
(3) Install the channel A harness (7) as follows:
(a) Install the p-clamp (25) on the harness (7).
(b) Connect the electrical connector (8) to the proximity sensor (10) on the right upper actuator (11) (Ref. AMM TASK 70-70-00-910-804).
(c) Connect the electrical connector (6) to the Linear Variable Differential Transducer (LVDT) (5) on the right upper actuator (11) (Ref. AMM TASK 70-70-00-910-804).
(d) Connect the electrical connector (17) to the receptacle on the interface bracket (15) (Ref. AMM TASK 70-70-00-910-804).
(e) Attach the p-clamp (25) to the support bracket (21) with the bolt (24).
(f) Put the harness (7) in the spring clip (26) of the support bracket (2).
(g) Adjust the tension in the harness (7) and make sure the harness does not touch adjacent components.
(4) Install the channel B harness (4) as follows:

CAUTION: MAKE SURE THERE IS CLEARANCE BETWEEN THE ELECTRICAL HARNESS AND THE FORWARD FRAME PARTS OR DAMAGE CAN OCCUR.

(a) Install the p-clamp (22) on the harness (4).
(b) Connect the electrical connector (3) to the proximity sensor (1) on the right upper actuator (11) (Ref. AMM TASK 70-70-00-910-804).
(c) Connect the electrical connector (16) to the interface bracket (15) (Ref. AMM TASK 70-70-00-910-804).
(d) Attach the p-clamp (22) to the support bracket (21) with the bolt (23).
(e) Adjust the tension in the harness (4) and make sure the harness does not touch adjacent components.
(5) Complete the installation of the channel A harness (7) and the channel B harness (4) as follows:
(a) Open the right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806).
(b) If the block clamp (29) on the support bracket (28) is closed, remove the bolt (30) to open the block clamp.
(c) Put the two harnesses (7) and (4) in position in the block clamp (29). The channel A harness goes in the forward opening in the block clamp. The channel B harness goes in the aft opening.
(d) Close the block clamp (29) and install the bolt (30).
(e) Adjust the tension in the two harnesses (7) and (4). Make sure that no harness touches adjacent components.
(f) TORQUE the bolt (30) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.
(g) Close the right thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806).
(h) TORQUE the bolts (23) and (24) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

5. Close-up
Subtask 71-51-43-420-090-A

A. Do the reactivation of the thrust reverser system after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 71-51-43-410-087-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 71-51-43-710-073-A

C. Test
(1) Do the thrust reverser cycling test (menu mode) (Ref. AMM TASK 73-29-00-740-804).

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