Installation of the Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05) [PW11]

TASK 77-21-61-400-802-A
Installation of the Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05)

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

ZONE: 400
FIN: 4207KS ** ON A/C NOT FOR ALL

1. Reason for the Job
Use this procedure to install the Exhaust Gas Temperature (EGT) (T5/T3) wiring harness (WC05).
For more information on the temperature indicating system, refer to (77-00-00-00U).
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 - CONNECTOR, JAW, SOFT
No specific	Torque wrench: range to between 20 and 16 lbf.in (0.23 and 0.18 m.daN )
No specific	Torque wrench: range to between 30 and 26 lbf.in (0.34 and 0.29 m.daN )
No specific	Torque wrench: range to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )

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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-21-00-710-807-A	Test No.6 - EEC Operation Test (Idle 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
Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05)

3. Job Set-up
Subtask 77-21-61-941-053-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 77-21-61-010-056-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 77-21-61-040-053-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 77-21-61-010-057-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (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.

4. Procedure
Subtask 77-21-61-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05)

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

CAUTION: DO NOT TORQUE THE STUD NUTS MORE THAN THE SPECIFIED TORQUE. IF YOU DO, YOU CAN DAMAGE OR BREAK THE STUDS.

(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) Disconnect the wiring harness (WC10) connector (P110) from the wiring harness (W03) receptacle (J110) with a PLIERS - CONNECTOR, JAW, SOFT

Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05) ** ON A/C NOT FOR ALL

NOTE: It is necessary to remove the wiring harness (WC10) to install the wiring harness (WC05).

(3) Connect the wiring harness (WC05) connector (P43) to the wiring harness (WC10) receptacle (J43) as follows:
(a) Examine, align and engage the connector.
(b) Push lightly inward on the connector while you tighten the coupling ring.
(c) Use the PLIERS - CONNECTOR, JAW, SOFT to tighten the connector against the receptacle.
(d) Make sure that you can feel the ratchet feature.
(e) While you tighten, push the connector from side to side.
(f) Tighten the connector until the PLIERS - CONNECTOR, JAW, SOFT slip on the connector ring.
(4) Connect the wiring harness (WC10) connector (P110) to the wiring harness (W03) receptacle (J110) as follows:
(a) Examine, align and engage the connector.
(b) Push lightly inward on the connector while you tighten the coupling ring.
(c) Use the PLIERS - CONNECTOR, JAW, SOFT to tighten the connector against the receptacle.
(d) Make sure you can feel the ratchet feature.
(e) While you tighten, push the connector from side to side.
(f) Tighten the connector until the PLIERS - CONNECTOR, JAW, SOFT slip on the connector ring.
(5) Connect the harness (WC05) (1) to the T3 probe with the four nuts and install the harness to the mounting bracket with the two clamps and the two bolts:

Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05) ** ON A/C NOT FOR ALL

(a) TORQUE the large nuts to between 30 and 26 lbf.in (0.34 and 0.29 m.daN )

.
(b) TORQUE the small nuts to between 20 and 16 lbf.in (0.23 and 0.18 m.daN )

.
(c) Install the two clamps and the two bolts.
(d) TORQUE the bolts to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )

.
(6) Connect the harness (WC05) (1) to the two left and two right EGT T5 probes on the Turbine Exhaust Case (TEC) with the nuts:

Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05) ** ON A/C NOT FOR ALL

(a) TORQUE the large nut to between 30 and 26 lbf.in (0.34 and 0.29 m.daN )

.
(b) TORQUE the small nut to between 20 and 16 lbf.in (0.23 and 0.18 m.daN )

.
(7) Install the harness (WC05) (1) to the spring clips as follows:

Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05) ** ON A/C NOT FOR ALL

(a) Find the spring clips along the top side of the engine.
(b) Carefully push the harness (WC05) (1) into the spring clips from the middle of the harness.
(c) Adjust the harness (WC05) (1) in the spring clips to remove any stress.
(d) Distribute the slack in the harness (WC05) (1) equally.
(8) Examine the assembly for foreign objects, damage and correct assembly.
(9) 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 COVER - PROTECTION as necessary to prevent damage to the engine.

5. Close-up
Subtask 77-21-61-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR

Subtask 77-21-61-440-051-A ** ON A/C NOT FOR ALL

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

Subtask 77-21-61-410-051-A ** ON A/C NOT FOR ALL

C. 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).
(4) 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).

Subtask 77-21-61-710-050-A ** ON A/C NOT FOR ALL

D. Test
(1) Do the test No.6 - EEC - Idle test (Ref. AMM TASK 73-21-00-710-807).

[Rev.10 from 2021] 2026.04.01 03:18:57 UTC