Installation of the Pylon TRAS Tee-Piece [PW11]

TASK 78-31-49-400-813-A
Installation of the Pylon TRAS Tee-Piece

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.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	2	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	Torque wrench: range to between 93.8 and 72.5 lbf.in (1.06 and 0.82 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.PU1-0001)	lint-free cotton cloth
(Material No.PU1-0006)	abrasive pad
(Material No.PU2-0001)	alcohol, isopropyl
(Material No.PU4-0001)	varnish-blue

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
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 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)
TASK 78-31-50-400-801-A	Installation of the TRAS Hydraulic Tubes and Hoses
TASK 78-31-51-400-803-A	Installation of the Pylon Hydraulic Tubes and Hoses
Pylon TRAS Tee-Piece

3. Job Set-up
Subtask 78-31-49-941-129-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 78-31-49-864-054-A ** ON A/C NOT FOR ALL

B. Depressurization of the Hydraulic Reservoirs
(1) For engine 1, depressurize the green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(2) For engine 2, depressurize the yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).

Subtask 78-31-49-010-228-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 78-31-49-040-176-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 78-31-49-420-176-A ** ON A/C NOT FOR ALL

A. Installation of the TRAS Tee-Piece

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Install the TRAS tee-piece (1) on the pylon floor.
(a) Clean the mating surfaces of the bolt (4), washer (5) and tee-piece (1) with a lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl or equivalent.
(b) Remove the alcohol with a lint-free cotton cloth (Material No.PU1-0001) before it dries.
(c) Lightly abrade the mating surfaces of the bolt (4), washer (5) and tee-piece (1) with abrasive pad (Material No.PU1-0006)
1 Make sure that you do not abrade the threads of the bolt (4).
(d) Clean again the mating surfaces of the bolt (4), washer (5) and tee-piece (1) with a lint-free cotton cloth (Material No.PU1-0001) and PU2-0001alcohol, isopropyl or equivalent.
(e) Remove the alcohol with a lint-free cotton cloth (Material No.PU1-0001) before it dries.
(f) Install the tee-piece (1) to the brackets on the pylon floor with bolts (2) and (4), washers (3) and (5).
(g) TORQUE the bolts (2) and (4) to between 93.8 and 72.5 lbf.in (1.06 and 0.82 m.daN )

.
(h) Measure the resistance at the bolt (4).
1 Make sure that it is less than 0.010 ohm. If the resistance is more than 0.010 ohm, repeat steps 4.A.(1).(a) thru 4.A.(1).(g).
(i) Apply the varnish-blue (Material No.PU4-0001) on the head of the bolt (4).
(j) Connect the TRAS hydraulic lines to the tee-piece (1) (Ref. AMM TASK 78-31-50-400-801).
1 Connect the two hydraulic stow hoses to the tee-piece (1).
2 Connect the two hydraulic deploy hoses to the tee-piece (1).
3 Connect the two hydraulic return hoses to the tee-piece (1).
(k) Connect the pylon hydraulic lines to the tee-piece (1) (Ref. AMM TASK 78-31-51-400-803).
1 Connect the hydraulic stow tube to the tee-piece (1).
2 Connect the hydraulic deploy tube to the tee-piece (1).
3 Connect the hydraulic return tube to the tee-piece (1).

5. Close-up
Subtask 78-31-49-440-116-A ** ON A/C NOT FOR ALL

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

Subtask 78-31-49-863-050-A ** ON A/C NOT FOR ALL

B. Pressurization of the Hydraulic Reservoir
(1) For engine 1, pressurize the green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) For engine 2, pressurize the yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(3) Make sure that there is no leaks at the tube connections.

Subtask 78-31-49-710-093-A ** ON A/C NOT FOR ALL

C. Do the operational test
(1) Do the operational test and bleeding of the thrust reverser (Ref. AMM TASK 78-31-00-710-805).

Subtask 78-31-49-010-243-A ** ON A/C NOT FOR ALL

D. 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 78-31-49-790-051-A ** ON A/C NOT FOR ALL

E. Leak Check
(1) Make sure that there is no leakage from the hoses or the connections of the TRAS tee piece.

Subtask 78-31-49-410-132-A ** ON A/C NOT FOR ALL

F. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) 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
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:31:30 UTC