Installation of the Main Junction Box [CFMB]

TASK 77-21-10-400-025-A
Installation of the Main Junction Box

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 53 and 47 lbf.in (0.60 and 0.53 m.daN )
No specific	Torque wrench: range to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )
No specific	Torque wrench: range to between 180 and 135 lbf.in (2.03 and 1.53 m.daN )
No specific	Torque wrench: range to between 186 and 168 lbf.in (2.10 and 1.90 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
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 73-29-00-710-040-B-02	Operational Test of the FADEC on the Ground (with Engine Non motoring)
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 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Main Junction Box

3. Job Set-up
Subtask 77-21-10-860-059-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).

Subtask 77-21-10-010-085-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 77-21-10-040-069-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 77-21-10-420-059-A ** ON A/C NOT FOR ALL

A. Installation of the Main Junction Box
(1) Remove the blanking plugs and caps from the electrical connectors and receptacles.
(2) Apply a thin layer of graphite grease (Material No.CP2101) on the threads of the bolts (50), (80) and (120).

CAUTION: DO NOT APPLY LUBRICANT OR ANTI-SEIZE COMPOUND (SPRAY OR LIQUID) INTO THE CONNECTOR NUT AND RECEPTACLE. LUBRICANT THAT TOUCHES INTERNAL CHROMEL AND ALUMEL WIRES CAN CAUSE EGT INCORRECT INDICATION.

(3) Install the main junction box (20) on the rear face of the support sector ring and engage the connector receptacle in the sector ring.
(4) Attach the main junction box (20) to flange S with bolts (50) and nuts (30).
(5) TORQUE the nuts (30) to between 110 and 100 lbf.in (1.24 and 1.13 m.daN )

.
(6) Make sure that the connectors and receptacles are clean and clear of unwanted materials.

(7) Connect the main junction box leads (20) to the upper left T495 sector junction box (100) and to the lower left T495 sector junction box (140).
(8) TORQUE the connecting nuts to between 186 and 168 lbf.in (2.10 and 1.90 m.daN )

and safety with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.
(9) Install the parts which attach the main junction box leads (20) as follows:

(a) Install the clamp (90).
(b) Install the bolt (80) on the bracket (70) on flange S at the 10:15 o'clock position (Detail C).
(c) Install the clamp (130).
(d) Install the bolt (120) on the bracket (110) on flange S at the 8:30 o'clock position (Detail E).
(10) Connect the upper extension lead (10) and the lower extension lead (40) to the main junction box (20). Tighten the connectors by hand.
(11) TORQUE the bolts (80), (120) to between 53 and 47 lbf.in (0.60 and 0.53 m.daN )

(12) Connect CJ13 harness connector (60) to the main junction box (20).
(13) TORQUE the connecting nuts to between 180 and 135 lbf.in (2.03 and 1.53 m.daN )

and safety with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia.

Subtask 77-21-10-869-058-A ** ON A/C NOT FOR ALL

B. Do the ECAM start procedure (Ref. AMM TASK 31-60-00-860-001).

Subtask 77-21-10-710-059-A ** ON A/C NOT FOR ALL

C. Do an Operational Test of the FADEC Ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).

5. Close-up
Subtask 77-21-10-869-059-A ** ON A/C NOT FOR ALL

A. Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).

Subtask 77-21-10-410-069-A ** ON A/C NOT FOR ALL

B. 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 WARNING NOTICE(S).

Subtask 77-21-10-440-059-A ** ON A/C NOT FOR ALL

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

Subtask 77-21-10-410-070-A ** ON A/C NOT FOR ALL

D. 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).

[Rev.10 from 2021] 2026.04.01 03:17:29 UTC