Replacement of the Left Translating Cowl Seals - VRS2071 [IAE]

TASK 78-32-46-300-010-A
Replacement of the Left Translating Cowl Seals - VRS2071

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
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.V08-031)	silicone rubber compound
(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. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	END PLUG	AIPC 78-32-46-84-030
3	SEAL	AIPC 78-32-46-84-040
2	SCREW	AIPC 78-32-46-84-050

E. 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
Left Translating Cowl Seal

3. Job Set-up
Subtask 78-32-46-941-051-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 78-32-46-010-056-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) in to position.

Subtask 78-32-46-040-052-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust:

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 78-32-46-010-057-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 78-32-46-350-050-A ** ON A/C NOT FOR ALL

A. Remove the left translating cowl seal (3).

Left Translating Cowl Seal ** ON A/C NOT FOR ALL

CAUTION: THE SEAL AND SEAL BLOCK ARE BONDED TO EACH OTHER WITH SILICONE RUBBER COMPOUND. CAREFULLY SEPARATE THE SEAL AND SEAL BLOCK TO AVOID DAMAGE TO THE UNDAMAGED PART.

(1) Remove the screw (2).
(2) Remove the seal block (1) from the seal (3).
(3) Remove the seal (3) from the retainer.

Subtask 78-32-46-110-050-A ** ON A/C NOT FOR ALL

B. Clean the repair area.
(1) Clean the repair area with a 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 78-32-46-350-051-A ** ON A/C NOT FOR ALL

C. Install the seal (3)

Left Translating Cowl Seal ** ON A/C NOT FOR ALL

(1) Position AIPC 78-32-46-84-040 SEAL (3) so that the 0.13 in. (3.3 mm) diameter holes point inboard and are next to the retainer flange and along the retainer inner diameter.
(2) Trim the seal to size.

Subtask 78-32-46-350-052-A ** ON A/C NOT FOR ALL

D. Install the end plug and the seal block

Left Translating Cowl Seal ** ON A/C NOT FOR ALL

(1) Apply the silicone rubber compound (Material No.V08-031) to the seal block (1) and the end plug (4).
(2) Install the AIPC 78-32-46-84-030 END PLUG (4) and the seal block (1) on the seal (3).
(3) Install AIPC 78-32-46-84-050 SCREW (2).
(4) Remove all unwanted silicone rubber compound with a clean Textile-Lint free Cotton - (Material No.14SBA1) .
(5) Let the silicone rubber compound cure for a minimum of 8 hours at 59 deg.F (15 deg.C) before you handle it.

NOTE: You do not have to fully cure the silicone rubber compound under repair conditions. The uncured silicone rubber compound is structurally and functionally acceptable.

Subtask 78-32-46-210-050-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-46-350-053-A ** ON A/C NOT FOR ALL

F. Write VRS2071 adjacent to the assembly number on the translating cowl to show that the repair has been done. Use a marking pen (Material No.V06-131) of a color which is different than the background.

5. Close-up
Subtask 78-32-46-410-056-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 78-32-46-440-051-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-46-410-057-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 78-32-46-710-052-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 13:12:33 UTC