Removal of the HJ12 Harness for SAC Engines [CFMB]

TASK 73-21-50-000-045-A
Removal of the HJ12 Harness for SAC Engines

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 SAC 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, 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
HJ12 Harness

3. Job Set-up
Subtask 73-21-50-941-085-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 73-21-50-010-105-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 73-21-50-040-117-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-50-010-136-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 73-21-50-020-073-A ** ON A/C NOT FOR ALL

A. Removal of the HJ12 Harness
(1) Disconnect the HJ12 harness from the ECU (receptacle J12) and from the CJ12R and CJ12L harness bulkhead connectors in the 6 o'clock tube bundle junction box. Use PLIERS - CONNECTOR, JAW, SOFT only if necessary.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove parts which attach the HJ12 harness as follows:

REMOVE	FROM	NOTE
Nuts (230) Bolts (220) Plates (250)	Bracket assembly (210)	On fan frame between flange E and flange F at the 5 o'clock position (Detail D)
Bolts (20) Cover plate (50)	Clamp (10) on bracket (30)	On fan frame between flange E and flange F at the 5:45 o'clock position (Detail E)
Bolts (170) Cover plate (200)	Bracket (180)	On TGB right-hand side (Detail F)
Bolts (60) Cover plate (70)	Bracket (90)	On TGB right-hand side (Detail G)
PRE SB CFM56-5 72-079 Bolts (160) Cover plate (150)	Bracket (110) with clamp (130) and bracket (140)	On TGB rear face (Detail H)
POST SB CFM56-5 72-079 Nut (260) Bolt (270) Clamp (280)	Bracket (290)	On TGB rear face (Detail H)
Bolts (160) Cover plate (150) Bracket (140) END OF SB CFM56-5 72-079	Bracket (110)	On TGB rear face (Detail H)

(4) Disengage the HJ12 harness from the clip assembly (100) on the No. 7 strut (3 locations) (Detail J).
(5) Disengage the HJ12 harness from the flexible clamp (240), on fan frame between flange E and flange F at the 5 o'clock position (Detail D).
(6) Disengage the HJ12 harness from the flexible clamp (40), on fan frame between flange E and flange F at the 5:45 o'clock position (Detail E).
(7) Disengage the HJ12 harness from the flexible clamps (190), (80), (120) on TGB (Details F, G, H).
(8) Remove the HJ12 harness from the engine.

[Rev.10 from 2021] 2026.04.01 13:05:47 UTC