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

TASK 73-21-01-000-801-A
Removal of the Electronic Engine Control (EEC)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE 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: MAKE SURE THAT THERE IS NO POWER TO THE EEC BEFORE YOU INSTALL THE EPP TO THE EEC. IF THERE IS POWER TO THE EEC DURING THIS TASK, THE EPP DATA WILL NOT BE INSTALLED INTO THE EEC AND DAMAGE TO THE EEC OR EPP CAN OCCUR.

FIN: 4000KS1 ** ON A/C NOT FOR ALL
FIN: 4000KS2 ** 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	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT

B. Work Zones and Access Panels

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

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
Electronic Engine Control (EEC)

3. Job Set-up
Subtask 73-21-01-941-050-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 73-21-01-010-050-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
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 73-21-01-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the EEC

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

(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 COVER - PROTECTION as necessary to prevent damage to the engine.
(2) Disconnect and remove the EEC (1) as follows:
(a) Find the EEC (1) located approximately at the 2 o'clock position attached to the fan case assembly. See figure

Electronic Engine Control (EEC) ** ON A/C NOT FOR ALL

(b) Disconnect the harness connectors from the EEC (1) with the PLIERS - JAWED, SOFT as follows:

CAUTION: MAKE SURE THAT THE DATA STORAGE UNIT (DSU) REMAINS WITH THE ENGINE WHEN THE EEC IS REMOVED. IF YOU DO NOT OBEY THIS CAUTION AND AN INCORRECT DSU IS INSTALLED, ENGINE OPERATION CAN BE AFFECTED.

CAUTION: PUT CAPS OR COVERS ON ALL OPEN PORTS OF ENGINE COMPONENTS TO PREVENT CONTAMINATION OF INTERNAL SURFACES.

1 Disconnect the DSU from the EEC (1).
2 Disconnect (WF01) wiring harness connector (P2) from the EEC (1).
3 Disconnect (WF07) wiring harness connector (P8) from the EEC (1).
4 Disconnect (WF02) wiring harness connector (P1) from the EEC (1).
5 Disconnect (WF06) wiring harness connector (P7) from the EEC (1).
6 Disconnect (W03) wiring harness connectors (P4), (P6) and (P14) from the EEC (1).
7 Disconnect (W04) wiring harness connectors (P3), (P5) and (P13) from the EEC (1).
(3) Disconnect the tube (AS01) from the EEC (1).
(4) Remove the EEC (1) as follows. See figure

Electronic Engine Control (EEC) ** ON A/C NOT FOR ALL

(a) Removal of the bolts.

CAUTION: DO NOT COMPLETELY REMOVE THE TOP TWO BOLTS. HOLD THE EEC WHILE YOU REMOVE THE TOP TWO BOLTS TO PREVENT THE EEC FROM FALLING AND CAUSING DAMAGE DURING REMOVAL.

1 Remove the bolt (11) from the ground strap.
2 Remove the four bolts (12).
(b) Remove the EEC (1) from the EEC support brackets.
(5) Installation of protection covers

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

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

[Rev.10 from 2021] 2026.04.01 13:02:12 UTC