Removal of the Electronic Engine Control (EEC) Wiring Harness (WC08) [PW11]

TASK 73-21-68-000-802-A
Removal of the Electronic Engine Control (EEC) Wiring Harness (WC08)

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.

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

ZONE: 400
FIN: 4094KS ** ON A/C NOT FOR ALL

1. Reason for the Job
Use this procedure to remove the harness (WC08).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

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

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 462AR

C. 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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Removal of the EEC Wiring Harness (WC08)

3. Job Set-up
Subtask 73-21-68-941-055-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 73-21-68-010-054-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (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

Subtask 73-21-68-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System for Ground 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 73-21-68-010-055-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the right thrust reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.

4. Procedure

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

Subtask 73-21-68-020-052-A ** ON A/C NOT FOR ALL

A. Removal of EEC Wiring Harness WC08
(1) Removal of the 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) Find the harness (WC08) (1) attached to the right hand side of the engine core. See sheet 1 of the figure.

Removal of the EEC Wiring Harness (WC08) ** ON A/C NOT FOR ALL

(3) Remove the harness (WC08) (1) from the engine as follows. See sheets 1 thru 7 of the figure:

Removal of the EEC Wiring Harness (WC08) ** ON A/C NOT FOR ALL

(a) Disconnect the connectors of the harness (WC08) (1) from the engine with the PLIERS - JAWED, SOFT as follows:
1 Disconnect the connectors (P108) and (P109) from the harness (W04).
2 Disconnect the connector (P25) from the High Pressure Compressor (HPC) Stator Vane Actuator (SVA).
3 Disconnect the connector (P21) from the buffer air-valve solenoid.
4 Disconnect the connector (P46) from the fuel flow divider.
5 Disconnect the connector (P15) from the Integrated Fuel Pump and Control (IFPC).
6 Disconnect the connector (P65) from the core temperature sensor.
7 Disconnect the connector (P34) from the Fuel Filter Differential Pressure (FFDP) sensor.
8 Disconnect the connector (P30) from the starter.
9 Disconnect the connector (P26) from the Starter Air Control (SAC) valve.
10 Disconnect the connector (P27) from the fuel flow transmitter.
11 Disconnect the connector (P31) from the turbine Active Clearance Control (ACC) air valve.
(b) Disengage the harness (WC08) (1) from the spring clips.
(c) Remove the harness (WC08) (1) from the engine.
(d) Remove the two bolts (2), the two bolts (3) and the bracket (4) from the two brackets and the harness (W04) bracket. See sheet 2 of the figure.

Removal of the EEC Wiring Harness (WC08) ** ON A/C NOT FOR ALL

(4) Installation of the protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install all the necessary COVER - PROTECTION to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 03:03:14 UTC