Removal of the CJ12L Harness [CFMB]

TASK 73-21-50-000-027-A-01
Removal of the CJ12L Harness

1. Reason for the Job
This TASK is applicable for /P, /3 and /3 PIP engines
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	PLIERS - CONNECTOR, JAW, SOFT
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

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
CJ12L Harness (/P, /3 and /3 PIP engines) SAC

3. Job Set-up
Subtask 73-21-50-941-097-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 73-21-50-010-168-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 73-21-50-040-127-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-50-010-169-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 73-21-50-020-106-A ** ON A/C NOT FOR ALL

A. Removal of the CJ12L Harness
(1) Disconnect the CJ12L harness (10) from the VBV position sensor CH. B, the VSV position sensor CH. B and the TBV position sensor CH. B. Use PLIERS - CONNECTOR, JAW, SOFT only if necessary.
(2) Disconnect the HJ12 harness from the CJ12L bulkhead connector (150) in the 6 o'clock junction box. Use PLIERS - CONNECTOR, JAW, SOFT only if necessary.
(3) Cut and remove the lockwire which safeties the CJ11L, CJ12L and CJ13 bulkhead connector nuts together in the 6 o'clock junction box.
(4) Remove the nut (160) which attaches the bulkhead connector (150) to the 6 o'clock junction box (Detail B).
(5) Disengage the connector (150) from the 6 o'clock junction box.
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Remove the parts which attach the CJ12L harness (10) as follows:

REMOVE	FROM	NOTE
Nut (70) Bolt (110) Clamp (120)	Bracket (90), clamps (80) and (100) on CJ11L harness	On the core engine, at the 7 o'clock position (Detail F)
Bolt (30) Clamp (20)	The fan frame	At the 7:45 o'clock position (Detail C)
Bolt (130)	Bracket (140)	On the fan frame, at the 8:30 o'clock position (Detail D)
Bolt (50) Clamp (40)	Bracket (60)	On the VBV fuel gear motor, at the 9 o'clock position (Detail E)
Clamps (20), (40) and (120)	CJ12L harness	(Details C, E and F)

(8) Remove the CJ12L harness (10) from the engine.

[Rev.10 from 2021] 2026.04.01 02:58:42 UTC