Removal of the HJ5B Engine Wiring Harness [CFML]

TASK 73-21-60-000-809-A
Removal of the HJ5B Engine Wiring Harness

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 210
ZONE: 400
FIN: 4148KS

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2267)	RTV 106

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 72-24-01-000-801-A	Removal of Segment Shrouds 1 thru 5
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
HJ5B Engine Wiring Harness

3. Job Set-up
Subtask 73-21-60-941-069-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-60-010-072-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 73-21-60-040-060-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 73-21-60-010-094-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 73-21-60-020-060-A

A. Removal of the HJ5B Engine Wiring Harness (4148KS)
(1) Remove the segment shrouds 2 (4) (Ref. AMM TASK 72-24-01-000-801).
(2) Remove the segment shrouds 3 (3) (Ref. AMM TASK 72-24-01-000-801).

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

CAUTION: USE PLIERS THAT HAVE TEFLON JAWS TO TIGHTEN OR LOOSEN THE ELECTRICAL CONNECTORS. DO NOT USE PLIERS THAT HAVE METAL JAWS. METAL JAWS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS.

(3) Disconnection of the HJ5B engine wiring harness (4148KS) (1) (Ref. AMM TASK 70-70-00-910-804).

NOTE: If necessary, use PLIERS - JAWED, SOFT to disconnect the electrical connectors.

(a) Disconnect the HJ5B engine wiring harness (1) connector from the EEC channel B J5 receptacle (4601KS2) (5) (at the 3 o'clock position).
(b) Disconnect the HJ5B engine wiring harness (1) connector from the HJ6A engine wiring harness receptacle (4143KS) (13) (at the 3 o'clock position).
(c) Disconnect the HJ5B engine wiring harness (1) connector from the HJ5A engine wiring harness receptacle (4147KS) (12) (at the 3 o'clock position).
(d) Disconnect the HJ5B engine wiring harness (1) connector from the T25 channel B receptacle (4083KS) (14) (at the 3 o'clock position).
(e) Disconnect the HJ5B engine wiring harness (1) connector from the N1 Sensor channel B receptacle (4064KS) (17) (at the 3 o'clock position).
(f) Disconnect the HJ5B engine wiring harness (1) connector from the right variable bleed valve actuator (4167KS2) (18) (at the 3 o'clock position).
(g) Disconnect the HJ5B engine wiring harness (1) connector from the right variable stator vane actuator (4022KS2) (21) (at the 2:30 o'clock position).
PRE SB 72-0112
(h) Disconnect the HJ5B engine wiring harness (1) connector from the right modulated turbine cooling actuator (4163KS2) (22) (at the 2:30 o'clock position).
END OF PRE SB 72-0112

POST SB 72-0112 and PRE SB 72-0444
(i) Disconnect the HJ5B engine wiring harness (1) connector from the harness receptacle bracket (23) at the 2:30 o'clock position.

NOTE: The harness receptacle bracket (23) is deleted through SB 72-0444.

END OF POST SB 72-0112 and END OF PRE SB 72-0444
(j) Disconnect the HJ5B engine wiring harness (1) connector from the split control unit/servo valve assembly channel B receptacle (4186KS) (24) (at the 8 o'clock position).
(k) Disconnect the HJ5B engine wiring harness (1) connector from the nacelle anti-ice (4011DN) (25) (at the 9:30 o'clock position).
(l) Disconnect the HJ5B engine wiring harness (1) connector from the Fuel Metering Unit (FMU) channel B receptacle (4360KS) (26) (at the 9 o'clock position).
(4) Removal of the bolts from the clamps that attach to the HJ5B engine wiring harness (1):
(a) Remove the bolt (6) from the clamp (7).
(b) Remove the bolt (9) from the clamp (8).
POST SB 72-0122
(c) Remove the bolt (10) from the clamp (11).
END OF POST SB 72-0122

PRE SB 72-0444
(d) Remove the bolt (15) from the clamp (16).
END OF PRE SB 72-0444
(e) Remove the bolt (19) from the clamp (20).
(f) Remove the bolt (28) from the clamp (27).
(g) Remove the bolt (37) from the clamp (38).
PRE SB 72-0444
(h) Remove the bolt (39) from the clamp (40).
END OF PRE SB 72-0444
(5) Cut and remove the RTV 106 (Material No.CP2267) around the HJ5B engine wiring harness (1).
(6) Removal of the bracket assemblies:
(a) Removal of the bracket assembly (32):
1 Remove the five nuts (34) and the five bolts (31) that attach the bracket assembly (32) on the fireproof block (35) and bracket (33).
2 Remove the bracket assembly (32).
(b) Removal of the bracket assembly (29):
1 Remove the four nuts (36) and the four bolts (30) that attach the bracket assembly (29) on the fireproof block (35) and bracket (33).
2 Remove the bracket assembly (29).
(7) Remove and discard the fireproof block (35).
(8) Remove the HJ5B engine wiring harness (1) from the clipping point (2) along its routing.
(9) Carefully remove the HJ5B engine wiring harness (1) from the engine.
(10) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and disconnected connectors.

[Rev.10 from 2021] 2026.04.01 03:05:21 UTC