Installation of the Pylon TRAS Monitoring Harness [PW11]

TASK 78-31-61-400-813-A
Installation of the Pylon TRAS Monitoring Harness

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.

ZONE: 400
FIN: 4130KS ** 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 2M (6 FT) - ADJUSTABLE
No specific	1	PLIERS - JAWED, SOFT
No specific	Torque wrench: range to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )
No specific	Torque wrench: range to between 93.8 and 72.6 lbf.in (1.06 and 0.82 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0012)	tape
(Material No.PU1-0012A)	tape, glass cloth

C. Work Zones and Access Panels

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

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 73-25-34-400-802-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 78-31-00-710-805-A	Operational Test of Thrust Reverser with MCDU
TASK 78-31-00-710-805-A-01	Thrust Reverser Cycling Test (Engine Running)
Pylon TRAS Monitoring Harness

3. Job Set-up
Subtask 78-31-61-941-080-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 78-31-61-865-053-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENG1/REV/LOCK	1EG1	N44
** ON A/C NOT FOR ALL
121VU	ENG1/REV/LOCK	1EG1	R44
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENG2/REV/LOCK	1EG2	N45
** ON A/C NOT FOR ALL
121VU	ENG2/REV/LOCK	1EG2	R45

Subtask 78-31-61-010-102-A ** ON A/C NOT FOR ALL

C. 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 2M (6 FT) - ADJUSTABLE is in position.

Subtask 78-31-61-040-076-A ** ON A/C NOT FOR ALL

D. 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).

4. Procedure
Subtask 78-31-61-420-064-A ** ON A/C NOT FOR ALL

A. Installation of the Pylon TRAS Monitoring-Harness

CAUTION: USE PLIERS THAT HAVE TEFLON JAWS TO TIGHTEN THE ELECTRICAL CONNECTORS. DO NOT USE PLIERS THAT HAVE METAL JAWS. METAL JAWS CAN CAUSE DAMAGE TO THE ELECTRICAL CONNECTORS.

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR AND RECEPTACLE ARE CLEAN WHEN YOU CONNECT THEM. DIRTY CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.

(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) Install the pylon TRAS monitoring-harness (1).
(a) Put the pylon TRAS monitoring-harness (1) in the insert (3) and frame (2).
(b) Connect the pylon TRAS monitoring-harness (1) connectors (4052VC-A) and (4053VC-A) to the left TRAS monitoring-harness.
1 Turn the connectors finger-tight. Turn the connectors 1/4 turn more with PLIERS - JAWED, SOFT.
(c) Put the pylon TRAS monitoring-harness (1) in the insert (5) and frame (4).
(d) Connect the pylon TRAS monitoring-harness (1) connectors (4054VC-A) and (4055VC-A) to the right TRAS monitoring-harness.
1 Turn the connectors finger-tight. Turn the connectors 1/4 turn more with PLIERS - JAWED, SOFT.
(e) Wind tape (Material No.PU1-0012) or PU1-0012Atape, glass cloth around the pylon TRAS monitoring-harness (1) as necessary to make a snug fit in the two spring clips and two inserts (7).
(f) Put the pylon TRAS monitoring-harness (1) in the two spring clips on the rear ramp bracket.
(g) Put the pylon TRAS monitoring harness (1) in the two inserts (7).
(h) Attach the two inserts (7), the two frames (6) and the pylon TRAS motoring-harness (1) to the rear ramp bracket. Use the four bolts (9) and the four washers (8).

NOTE: Do not torque the bolts (9) at this time.

(i) Put the two clamps (10) on the pylon TRAS monitoring-harness (1).
(j) Attach the pylon TRAS monitoring harness (1) and the two clamps (10) to the pylon brackets. Use the two screws (12) and the two washers (11).

NOTE: Do not torque the screws (12) at this time.

(k) Put the clamp (15) on the pylon TRAS monitoring-harness (1).
(l) Attach the pylon TRAS monitoring harness (1) and the clamp (15) to the pylon bracket. Use the screw (14) and washer (13).

NOTE: Do not torque the screws (14) at this time.

(m) Put the clamp (18) on the pylon TRAS monitoring-harness (1).
(n) Attach the pylon TRAS monitoring-harness (1) and clamp (18) to the pylon bracket. Use the screw (16) and washer (17).

NOTE: Do not torque the screws (16) at this time.

(o) Connect the pylon TRAS monitoring-harness (1) connector (445VC-A) to the pylon interface.
1 Turn the connector finger-tight. Turn the connector 1/4 turn more with PLIERS - JAWED, SOFT.
(p) Attach the pylon TRAS monitoring-harness (1) to the pylon TRAS harness-disconnect-bracket. Use the eight bolts (19) and the eight washers (20).
1 Tighten the eight bolts (19) with your hand. Then tighten the bolts (19) 1/8 to 1/4 of a turn more.
(q) Connect the harnesses (4089KS) and (4093KS) to the pylon TRAS monitoring-harness (1) connectors (491VC) and (494VC).
1 Examine, align and engage the connectors.
2 Push lightly in 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 cannot continue to turn the connector ring.
(r) Adjust the pylon TRAS monitoring harness (1) to keep the preload to a minimum. Make sure that there are no kinks in the pylon TRAS monitoring harness (1).
(s) Tighten the bolts.
1 TORQUE the bolts (9) to between 35 and 31.5 lbf.in (0.40 and 0.36 m.daN )

.
(t) Tighten the screws.
1 TORQUE the screws (12), (14) and (16) to between 93.8 and 72.6 lbf.in (1.06 and 0.82 m.daN )

.
(u) Tighten the bolts on the frames (2) and (4).
1 Tighten the bolts on the frames (2) and (4) until you fully compress the spring.

5. Close-up
Subtask 78-31-61-440-063-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) Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-31-61-865-054-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENG1/REV/LOCK	1EG1	N44
** ON A/C NOT FOR ALL
121VU	ENG1/REV/LOCK	1EG1	R44
** ON A/C NOT FOR ALL
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENG2/REV/LOCK	1EG2	N45
** ON A/C NOT FOR ALL
121VU	ENG2/REV/LOCK	1EG2	R45

Subtask 78-31-61-410-076-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 78-31-61-710-052-A ** ON A/C NOT FOR ALL

D. Test
(1) Do an operational test of the thrust reverser (Ref. AMM TASK 78-31-00-710-805).

[Rev.10 from 2021] 2026.04.01 03:31:40 UTC