Installation of the EEC Wiring Harness (WC10) [PW11]

TASK 73-21-69-400-802-A
Installation of the EEC Wiring Harness (WC10)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT BEND OR TWIST THE HARNESS TOO MUCH. IF YOU DO, DAMAGE TO THE HARNESS CAN OCCUR.

FIN: 4011KS ** ON A/C NOT FOR ALL

1. Reason for the Job
Use this procedure to install the harness (WC10).
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	TIE WRAP(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-087)	tape, pressure sensitive, flat black

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-21-00-710-806-A	Test No.7 - EEC Operation Test (Self Test)
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
EEC Wiring Harness WC10

3. Job Set-up
Subtask 73-21-69-941-055-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 73-21-69-010-056-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 73-21-69-040-051-A ** ON A/C NOT FOR ALL

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) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 73-21-69-010-057-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the left thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL

4. Procedure
Subtask 73-21-69-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the EEC Wiring Harness (WC10)

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Removal of protection covers

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Put the harness (WC10) (1) on the engine. See Sheet 1 of the figure.

EEC Wiring Harness WC10 ** ON A/C NOT FOR ALL

(3) Connect the harness (WC10) (1) connectors to the engine as follows:
(a) Connect the connector (P38) to the main oil pressure sensor receptacle (J38) as follows: see Sheet 2 of the figure.

EEC Wiring Harness WC10 ** ON A/C NOT FOR ALL

1 Examine, align and engage the connector.
2 Push lightly on the connector while you tighten the coupling ring.
3 Use the PLIERS - JAWED, SOFT to tighten the connector against the receptacle.
4 Make sure that you can feel the ratchet feature.
5 While you tighten, push the connector in and from side to side.
6 Tighten the connector until the PLIERS - JAWED, SOFT slip on the connector ring.
(b) Connect the connector (P40) to the active oil damper valve receptacle (J40) as follows:
1 Examine, align and engage the connector.
2 Push lightly on the connector while you tighten the coupling ring.
3 Use the PLIERS - JAWED, SOFT to tighten the connector against the receptacle.
4 Make sure that you can feel the ratchet feature.
5 While you tighten, push the connector in and from side to side.
6 Tighten the connector until the PLIERS - JAWED, SOFT slip on the connector ring.
(c) Connect the connector (P52) to the fuel oil cooler bypass valve receptacle (J52) as follows:
1 Examine, align and engage the connector.
2 Push lightly on the connector while you tighten the coupling ring.
3 Use the PLIERS - JAWED, SOFT to tighten the connector against the receptacle.
4 Make sure that you can feel the ratchet feature.
5 While you tighten, push the connector in and from side to side.
6 Tighten the connector until the PLIERS - JAWED, SOFT slip on the connector ring.
(d) Connect the connector (P29) to the High Pressure Compressor (HPC) slave actuator receptacle (J29) as follows: see Sheet 3 of the figure.

EEC Wiring Harness WC10 ** ON A/C NOT FOR ALL

(a) Start at the middle of the harness (WC10) (1).
(b) Position and push the harness (WC10) (1) into the eight spring clips.
(c) Make sure that all the spring clips engage with the harness (WC10) (1).
(d) Make sure that the tension in the harness (WC10) (1) is sufficient to prevent loose or tight conditions.
(5) Installation of the tie wrap

CAUTION: INSTALL TIE WRAPS ON THE HARNESS TO MAKE SURE THAT THERE IS SUFFICIENT CLEARANCE FROM THE NACELLE. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE HARNESS CAN OCCUR.

(a) Install the TIE WRAP(S) to the harness (WC10) (1) and harness (W03). See Sheets 1 and 4 of the figure.

EEC Wiring Harness WC10 ** ON A/C NOT FOR ALL

(6) Examine the harness (WC10) (1) for contact with engine hardware which may cause chafing. See Sheet 1 of the figure.

EEC Wiring Harness WC10 ** ON A/C NOT FOR ALL

NOTE: It is permitted to use P05-087tape, pressure sensitive, flat black on the harness (WC10) if it is loose in the spring clips.

(7) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 73-21-69-700-050-A ** ON A/C NOT FOR ALL

A. Test
(1) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
(2) Do the test No. 7 (Ref. AMM TASK 73-21-00-710-806).

Subtask 73-21-69-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL

Subtask 73-21-69-440-050-A ** ON A/C NOT FOR ALL

C. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 73-21-69-410-051-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:03:17 UTC