Removal of the Left Electrical Harness [CFMB]

TASK 78-31-42-000-043-A
Removal of the Left Electrical Harness

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** 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	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	COVER - PROTECTION
No specific	AR	PLIERS - NOSE, SOFT, LONG
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Left Electrical Harness

3. Job Set-up
Subtask 78-31-42-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-31-42-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-31-42-040-050-A ** ON A/C NOT FOR ALL

C. Make thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041)

Subtask 78-31-42-010-051-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 78-31-42-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Left Electrical Harness
(1) Use the PLIERS - NOSE, SOFT, LONG to loosen the electrical connectors on the stow-switches of the upper and lower blocker doors.
(2) Use the PLIERS - NOSE, SOFT, LONG to loosen the electrical connector of the beam electrical harness.
(3) Disconnect the electrical connectors.
(4) Remove the nuts, the bolts and the clamps that attach the electrical harness to the pipes.
(5) Remove the nuts, the bolts and the clamps that attach the electrical harness to the supports.
(6) Remove the nut, the bolt, the washer and the clamp from the two half clamps.
(7) Disconnect the right electrical harness connector from the electrical junction box.
(8) Disconnect the electrical connectors (4100KS-A and 4100KS-B) from the junction box.
(9) Remove the electrical harness from the engine.
(10) Put COVER - PROTECTION on the electrical connectors.

[Rev.10 from 2021] 2026.04.01 03:24:29 UTC