Installation of the HJ7 Engine Wiring Harness [CFML]

TASK 73-21-60-400-812-A
Installation of the HJ7 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.

FIN: 4138KS

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	1	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 46.2 and 41.8 lbf.in (0.52 and 0.47 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-710-802-A	FADEC Test (Menu Mode)
HJ7 Engine Wiring Harness

3. Job Set-up
Subtask 73-21-60-941-076-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) Make sure that the WARNING NOTICE(S) are 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-60-010-079-A

B. Get Access
(1) Make sure that the fan cowl doors are open (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
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

4. Procedure
Subtask 73-21-60-420-067-A

A. Installation of the HJ7 Engine Wiring Harness (4138KS)
(1) Remove all the COVER - PROTECTION and the CAP - PROTECTION from all the openings, tubes, hoses and connectors.
(2) Make sure that the mating surfaces are clean and clear of unwanted materials.
(3) Install the HJ7 engine wiring harness (1) in the correct position in four clips (2) along its routing.
(4) Installation of the bolt (5) on the clamp (6) to attach the HJ7 engine wiring harness (1):
(a) Install the bolt (5) on the clamp (6) and tighten it with your hand.
(b) TORQUE the bolt (5) to between 46.2 and 41.8 lbf.in (0.52 and 0.47 m.daN )

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: YOU MUST NOT USE PLIERS WITH METAL JAWS TO TIGHTEN OR LOOSEN THE CONNECTOR. THE METAL JAWS WILL CAUSE DAMAGE TO THE CONNECTOR.

(5) Connection of the HJ7 engine wiring harness (4138KS) (1) connectors to these receptacles:

NOTE: Only if necessary, use PLIERS - JAWED, SOFT.

(a) Connect the HJ7 engine wiring harness (1) connector P7B to the EEC channel B J7 receptacle (4601KS2) (4) (at the 3 o'clock position).
(b) Connect the HJ7 engine wiring harness (1) connector P7A to the EEC channel A J7 receptacle (4601KS1) (3) (at the 2 o'clock position).
(c) Tighten the electrical harness connectors until you cannot see the color marks on the receptacles.
(d) Make sure that the electrical harness connectors do not move after you fully engage them.

5. Close-up
Subtask 73-21-60-710-077-A

A. Test
(1) Do the FADEC test (Menu Mode) (Ref. AMM TASK 73-29-00-710-802).

Subtask 73-21-60-410-065-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:07:21 UTC