Removal of the CJ12R Harness [CFMI]

TASK 73-21-50-000-004-A
Removal of the CJ12R 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	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 72-23-00-000-005-A	Removal of the Fan Duct Panels
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
CJ12R Harness

3. Job Set-up
Subtask 73-21-50-941-053-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 73-21-50-010-053-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 73-21-50-040-056-A ** ON A/C NOT FOR ALL

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

Subtask 73-21-50-010-072-A ** ON A/C NOT FOR ALL

D. Open the right thrust reverser door (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR

4. Procedure
Subtask 73-21-50-020-095-B ** ON A/C NOT FOR ALL

A. Removal of the CJ12R Harness
(1) Remove the fan duct panel over the T25 sensor (Ref. AMM TASK 72-23-00-000-005).
(2) Disconnect the electrical harness from the T25 temperature sensor.

PRE SB CFM56-5 75-031
(3) Disconnect the electrical harness from the RACC valve position sensor, the HPTACC valve position sensor and the LPTACC valve position sensor.

POST SB CFM56-5 75-031
(4) Disconnect the electrical harness from the HPTACC valve position sensor and the LPTACC valve position sensor.
END OF SB CFM56-5 75-031

PRE SB 72-021

(5) Disconnect the harness from the J12 harness receptacle in the 6 o'clock junction box. Remove the 2 bolts (27) and nuts (26) which attach CJ12R receptacle flange to the right side (aft looking forward) of the 6 o'clock junction box (detail B).

POST SB 72-021

(6) Disconnect the harness from the J12 harness receptacle in the 6 o'clock junction box. remove the 2 bolts (27) which attach the CJ12R receptacle flange to the right side (aft looking forward) of the 6 o'clock junction box (detail B).

END OF SB 72-021

(7) Remove the bolt (3) which attaches the CJ12R receptacle flange to the fan frame center hub at the 5 o'clock (T25 sensor) location (detail C).
(8) Remove the loop clamps that attach the electrical harness. To do this, remove the bolts and nuts from the locations which follow:
(a) The air scoop forward bracket at the 4 o'clock location on the fan frame center hub (detail D).

PRE SB CFM56-5 75-031
(b) The bracket at the 3 o'clock location on the core engine (detail E).

POST SB CFM56-5 75-031
(c) Not applicable
END OF SB CFM56-5 75-031
(9) The brackets at the 2 o'clock location on the core engine (details F and G).
(10) Remove the 2 bolts (39) and nuts (37) which attach the harness junction box to the bracket at the 3 o'clock location on the fan frame center hub (detail H).
(11) Remove the harness.
(12) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(13) Remove all the clamps from the harness.

[Rev.10 from 2021] 2026.04.01 02:56:16 UTC