Replacement of the Lower Track Seal/Retainer - Left Thrust Reverser - VRS2053 [IAE]

TASK 78-32-49-300-011-A
Replacement of the Lower Track Seal/Retainer - Left Thrust Reverser - VRS2053

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

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job

NOTE: This task is applicable to PRE SBN 70-0401 Replacement of the Lower Seal/ Retainer - Left Thrust Reverser only.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	MACHINE - DRILLING
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-076)	Methyl Ethyl Ketone, Technical grade
(Material No.V06-131)	marking pen
(Material No.V07-139)	thinner
(Material No.V07-140)	primer converter
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-31-00-710-041-A	Operational Test of the Thrust Reverser System with the CFDS
TASK 78-31-00-710-041-A-02	Operational test of the Thrust Reverser without the CFDS and Engine Running
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
AIPC 78-32-49-86
Left Thrust Reverser Lower Track Seal/Retainer

3. Job Set-up
Subtask 78-32-49-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 78-32-49-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-32-49-040-051-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser.

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-32-49-010-053-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

4. Procedure
Subtask 78-32-49-350-052-A ** ON A/C NOT FOR ALL

A. Remove the worn or damaged seal and retainer
(1) To remove the seal (2) or (6), pull the damaged seal from the retainer (1), (5), (7) or (8).
(2) To remove the seal (3), drill out the rivets (9) with MACHINE - DRILLING and remove the retainer (4) and the seal. Do not make the rivet holes larger.
(3) To remove the retainer (1), (5), (7) or (8), drill out the rivets (9) and remove the damaged retainer. Do not make the rivet holes larger.

Subtask 78-32-49-110-051-A ** ON A/C NOT FOR ALL

B. Clean the repair area
(1) Clean the repair area with clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with V01-076Methyl Ethyl Ketone, Technical grade .
(2) Wipe the surface dry before the cleaning fluid evaporates.

Subtask 78-32-49-350-053-A ** ON A/C NOT FOR ALL

C. Make a new retainer and a new seal
AIPC 78-32-49-86
(1) Cut the replacement retainers (1), (4), (5), (7) or (8) to size. Only the damaged part of the retainer must be replaced. Serviceable parts of the retainer may be reused.
(2) Cut the replacement seal (2), (3) or (6) to size.
(3) For the retainer (4) and the seal (3), align the retainer and the seal on the lower track and backdrill the rivet holes to between 0.125 in. (3.18 mm) and 0.129 in. (3.28 mm).
(4) For the retainer (1), (5), (7) or (8), align the retainer on the lower track and backdrill the rivet holes to between 0.125 in. (3.18 mm) and 0.129 in. (3.28 mm).
(5) Remove the burrs from the drilled holes.

Subtask 78-32-49-350-054-A ** ON A/C NOT FOR ALL

D. Mixing
(1) Mix the primer converter (Material No.V07-140) and the thinner (Material No.V07-139) . Refer to the manufacturer's instructions.

Subtask 78-32-49-350-055-A ** ON A/C NOT FOR ALL

E. Install the retainer
AIPC 78-32-49-86
(1) To install the retainer (1), (5), (7) or (8), put the retainer in position on the lower track.
(2) To install the retainer (4) and the seal (3), put the retainer and seal in position on the lower track.
(3) Use the prepared primer and wet install the rivet (9).
(4) Remove all unwanted primer with a clean lint free cloth made moist with methylethylketone .

Subtask 78-32-49-350-056-A ** ON A/C NOT FOR ALL

F. Install the seal
AIPC 78-32-49-86
(1) To install the seal (2) or (6), insert the seal in to the retainer (1), (5), (7) or (8).
(2) Trim all unwanted seal material from the retainer edge.

Subtask 78-32-49-210-051-A ** ON A/C NOT FOR ALL

G. Visually examine the completed repair to make sure that the requirements of this repair procedure are done.

Subtask 78-32-49-350-057-A ** ON A/C NOT FOR ALL

H. Assembly number on the C-duct
(1) Write VRS2053 adjacent to the assembly number on the C-duct to show that the repair has been done. Use a marking pen (Material No.V06-131) of a colour which is different than the background.

5. Close-up
Subtask 78-32-49-410-052-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 78-32-49-440-051-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 78-32-49-410-053-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 78-32-49-710-056-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).

NOTE: As an alternative procedure, you can do the operational test without the CFDS (Ref. AMM TASK 78-31-00-710-041).

[Rev.10 from 2021] 2026.04.01 03:28:58 UTC