Removal of the CJ12L Harness [CFMB]

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

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This TASK is applicable for NON /P 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 (Only Applicable NON /P Engines) for SAC Engine

3. Job Set-up
Subtask 73-21-50-941-077-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 73-21-50-010-097-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 73-21-50-040-108-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-50-010-114-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 73-21-50-020-065-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 RACSB valve position sensor CH. B. Use PLIERS - CONNECTOR, JAW, SOFT only if necessary.
(2) Disconnect the HJ12 harness from the CJ12L harness receptacle in the 6 o'clock junction box, left-hand side (ALF). Use PLIERS - CONNECTOR, JAW, SOFT only if necessary.
(3) Cut and remove the lockwire which safeties the CJ12L bulkhead connector nut (130) in the 6 o'clock junction box.
(4) Remove the nut (130) and disengage the CJ12L harness bulkhead connector from the 6 o'clock junction box (Detail B).
(5) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(6) Remove the parts which attach the CJ12L harness as follows:

REMOVE	FROM	NOTE
Bolt (30)	Clamp (20) on CJ12L harness and fan frame	At the 7:45 o'clock position (Detail C)
Bolt (100)	Bracket (110)	At the 8:30 o'clock position (Detail D)
Bolt (50)	Clamp (40) on bracket (60) on the VBV fuel gear motor	At the 9 o'clock position (Detail E)
Bolt (90)	Clamp (70) on CJ12L harness and bracket (80)	At the 7:30 o'clock position (Detail F)
Clamps (20), (40) and (70)	CJ12L harness (10)	(Details C, E and F)

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

[Rev.10 from 2021] 2026.04.01 02:58:41 UTC