Removal of the Electronic Engine Control (EEC) Wiring Harness (W03) [PW11]

TASK 73-21-63-000-802-A
Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)

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.

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

ZONE: 400
FIN: 4087KS ** 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)-ADJUSTABLE
No specific	AR	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

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, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 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 72-21-11-000-801-A	Removal of the Lower BiFi
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 W03

3. Job Set-up
Subtask 73-21-63-941-056-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 73-21-63-865-054-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	PHMU/ENG1	95KS1	P44
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	PHMU/ENG2	95KS2	P45
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 73-21-63-010-054-A ** ON A/C NOT FOR ALL

C. 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 73-21-63-040-050-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser 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 78-30-00-040-805).

Subtask 73-21-63-010-055-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 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 73-21-63-020-052-B ** ON A/C NOT FOR ALL

A. Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(1) Find the harness (W03) (1) attached to the left and right side of the fan case and to the left and right side of the engine core. See Sheets 1 thru 14 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(2) Remove the harness (W03) (1) from the engine with a PLIERS - JAWED, SOFT as follows: see Sheets 1 thru 14 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(a) Remove the bolt (12) from the brackets (13) and (14) and disengage the harness (W03) (1) from the block clamp (11) at two locations. See Sheet 2 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(b) Remove the bolt (12) from the brackets (15) and (17) and disengage the harness (W03) (1) from the block clamp (16).
(c) Disassemble the lower bifi as necessary to remove the harness (W03) (1) (Ref. AMM TASK 72-21-11-000-801).
(d) Remove and discard the three tie - electrical cables (50) from the harness (W03) (1). See Sheets 1 and 3 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(e) Disconnect the connector (P12) from the Permanent Magnet Alternator (PMA) receptacle (J12). See Sheet 4 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(f) Disconnect the connector (P33) from the oil temperature probe receptacle (J33).
(g) Disconnect the connector (P54) from the Variable Oil Reduction Valve (VORV) receptacle (J54).
(h) Disconnect the connector (P61) from the air/oil pressure sensor receptacle (J61).

POST SB C-72-00-0058A (Configuration 2 - Sensor Relocation Configuration)

(i) Disconnect the harness (W03) (1) connector (P32) from the forward vibration sensor receptacle (J32). See Sheets 1 and 12 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

END OF POST SB C-72-00-0058A (Configuration 2 - Sensor Relocation Configuration)

(j) Disconnect the connector (P18) from the Low Pressure Compressor (LPC) Stator Vane Actuator (SVA) receptacle (J18). See Sheets 5 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(k) Disconnect the connector (P39) from the P3 air pressure sensor receptacle (J39).
(l) Disconnect the Exhaust Gas Temperature (EGT) harness connector (P43) from the harness (W03) (1) receptacle (J43).
(m) Disconnect the connector (P57) from the buffer air valve solenoid receptacle (J21).
(n) Disconnect the harness (WC10) connector (P110) from the harness (W03) (1) receptacle (J110).
(o) Remove the bolt (27) from the forward side of the upper bracket.
(p) Remove the two bolts (28) and the harness (W03) (1) from the bracket.
(q) Disconnect the connector (P36) from the oil debris monitoring sensor receptacle (J36). See Sheet 6 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(r) Disconnect the connector (P41) from the oil quantity sensor receptacle (J41).
(s) Disconnect the connectors (P4), (P6) and (P14) from the EEC receptacles (J4), (J6) and (J14). See Sheet 8 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(t) Disconnect the connector (P10) from the Prognostic and Health Monitoring Unit (PHMU) receptacle (J10).
(u) Disconnect the connector (P101) from the harness (WF01) receptacle (J101).
(v) Disconnect the connector (P66) from the exciter box receptacle (J66). See Sheet 9 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(w) Disconnect the connectors (P106) and (P107) from the harness (W04) receptacles (J106) and (J107).
(x) Disconnect the connector (P48) from the N1 speed probe receptacle (J48). See Sheet 10 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(y) Disconnect the connector (P64) from the N2 speed probe receptacle (J64).
(z) Disconnect the connector (P16) from the integrated fuel pump and control receptacle (J16). See Sheet 11 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(aa) Disconnect the connector (P24) from the High Pressure Compressor (HPC) Stator Vane Actuator (SVA) receptacle (J24).
(ab) Disconnect the connector (P51) from the aft vibration sensor receptacle (J51).
(ac) Disconnect the connector (P20) from the nacelle anti-ice P1 sensor receptacle (J20). See Sheet 13 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(ad) Disconnect the connector (P56) from the HPC bleed valve air pressure sensor receptacle (J56).
(ae) Disconnect the connector (P59) from the nacelle anti-ice valve solenoid (lower) receptacle (J59).
(af) Remove the harness (W03) (1) from all the spring clips.

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(ag) Remove the tape - pressure sensitive adhesive (60) and the sleeve (70) from the harness (W03) (1) if necessary. See Sheets 1 and 15 of the figure:

Removal of the EEC Wiring Harness W03 ** ON A/C NOT FOR ALL

(ah) Remove the tape - pressure sensitive adhesive (60) from the harness (W03) (1) at the spring clip if necessary.
(ai) Remove the harness (W03) (1) from the engine.
(3) 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 engine damage.

[Rev.10 from 2021] 2026.04.01 13:06:41 UTC