Installation of the Left Electrical Harness [CFMB]

TASK 78-31-42-400-043-A
Installation 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	PLIERS - NOSE, SOFT, LONG
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 30 and 27 lbf.in (0.34 and 0.31 m.daN )
No specific	Torque wrench: range to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2245)	finish paint EA4 blue 5991

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-31-00-710-042-A	Operational Test of the Thrust Reverser System
TASK 78-31-00-710-043-A-01	Operational Test of the Thrust Reverser without CFDS - Engine Running
TASK 78-31-00-710-043-A	Operational Test of the Thrust Reverser without CFDS - Engine Not Running
TASK 78-31-00-710-043-A-01	Operational Test of the Thrust Reverser without CFDS - Engine Running
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Left Electrical Harness

3. Job Set-up
Subtask 78-31-42-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 78-31-42-010-059-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-36-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 78-31-42-040-054-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-31-42-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Left Electrical Harness

NOTE: Apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) on all nuts and connections after they are torqued.

(1) Remove the protective covers from the electrical connectors.
(2) Position the electrical harness on the engine.
(3) Connect the electrical connectors to the stow-switches of the upper and lower blocker doors. Tighten the connectors with the PLIERS - NOSE, SOFT, LONG.
(4) Connect the electrical connector to the beam electrical harness. Tighten the connector with the PLIERS - NOSE, SOFT, LONG.
(5) Connect the right electrical harness connector to the electrical junction box.
(6) Connect the electrical connectors (4100KS-A and 4100KS-B) to the junction box.
(7) Attach the electrical harness to the supports with the clamps, the bolts and the nuts.
(8) Attach the electrical harness to the two half clamps with the clamp, the bolt, the washer and the nut.
(9) Adjust if necessary:

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

(a) Adjust the electrical harness and clamps as necessary to get clearance between the harness and the frame.
(10) TORQUE the nut of the two half clamps to between 30 and 27 lbf.in (0.34 and 0.31 m.daN )

.
(11) TORQUE the other bolts and nuts to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

5. Close-up
Subtask 78-31-42-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors: (Ref. AMM TASK 78-36-00-410-040).
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the access platform(s).

Subtask 78-31-42-440-050-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 78-31-42-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

Subtask 78-31-42-710-051-A ** ON A/C NOT FOR ALL

D. Do an operational test of the thrust reverser system from the CFDS (Ref. AMM TASK 78-31-00-710-042).

NOTE: As an alternative procedure, you can do this operational test without the CFDS:

first method with engine not running (Ref. AMM TASK 78-31-00-710-043)
second method with engine running (Ref. AMM TASK 78-31-00-710-043)

[Rev.10 from 2021] 2026.04.01 03:24:30 UTC