Repair the Blank Cascade Panel Assembly Surface Damage - VRS2254 [IAE]

TASK 78-32-19-300-013-A
Repair the Blank Cascade Panel Assembly Surface Damage - VRS2254

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

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	LIGHT SOURCE - HEAT, SPARK-PROOF
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-076)	Methyl Ethyl Ketone, Technical grade
(Material No.V01-201)	distilled or deionized water
(Material No.V02-099)	lint free cloth
(Material No.V05-073)	aluminum oxide abrasive paper
(Material No.V05-074)	aluminum oxide abrasive paper
(Material No.V06-131)	marking pen
(Material No.V07-028)	conversion coating
(Material No.V07-139)	thinner
(Material No.V07-140)	primer converter

C. Work Zones and Access Panels

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

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 78-32-00-860-010-A	Manual Extension of the Thrust Reverser Translating Sleeves
TASK 78-32-00-860-011-A	Manual Retraction of the Thrust Reverser Translating Sleeves

3. Job Set-up
Subtask 78-32-19-941-055-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 78-32-19-010-060-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 position.

Subtask 78-32-19-040-056-A ** ON A/C NOT FOR ALL

C. Deactivation of 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 78-32-19-010-061-A ** ON A/C NOT FOR ALL

D. Extend the translating sleeves manually (Ref. AMM TASK 78-32-00-860-010).

4. Procedure
Subtask 78-32-19-350-060-A ** ON A/C NOT FOR ALL

A. Blend Out the Surface Damage
(1) Use the aluminum oxide abrasive paper (Material No.V05-074) to blend the damaged area to a 10 to 1 taper.
(2) Use the aluminum oxide abrasive paper (Material No.V05-073) to make the repair area smooth.
(3) Clean the repair area with a lint free cloth (Material No.V02-099) made moist with V01-076Methyl Ethyl Ketone, Technical grade. Rub the surfaces dry before the cleaning solvent becomes dry.

Subtask 78-32-19-350-061-A ** ON A/C NOT FOR ALL

B. Apply the Conversion Coating

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

(1) Use the manufacturer instructions to mix the conversion coating (Material No.V07-028) .
(2) Use a nylon brush or cheesecloth swab to apply three layers of the conversion coating to the bare metal of the repair area. Permit 3 minutes between layers. Use the distilled or deionized water (Material No.V01-201) to flush the surface after the last layer. Dry the surface.

Subtask 78-32-19-350-062-A ** ON A/C NOT FOR ALL

C. Apply the Primer
(1) Use manufacturer instructions to mix the primer converter (Material No.V07-140) and thinner (Material No.V07-139) .
(2) Use a brush to apply the primer to the repair surface.
(3) Cure the primer for 7 hours at room temperature or for 40 minutes between 140 and 180 deg.F (60 and 82 deg.C) with an LIGHT SOURCE - HEAT, SPARK-PROOF.

NOTE: You can touch the primer after you have cured it as described above. The primer is fully cured after 7 days at room temperature.

Subtask 78-32-19-220-053-A ** ON A/C NOT FOR ALL

D. Examine the Completed Repair
(1) Examine the completed repair to make sure all requirements of this repair procedure are done.

Subtask 78-32-19-350-063-A ** ON A/C NOT FOR ALL

E. Identify the Repair
(1) Make a mark VRS2254 with a marking pen (Material No.V06-131) adjacent to the assembly.

5. Close-up
Subtask 78-32-19-410-059-A ** ON A/C NOT FOR ALL

A. Manually retract the thrust reverser translating sleeves (Ref. AMM TASK 78-32-00-860-011).

Subtask 78-32-19-440-055-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-19-410-060-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 78-32-19-710-055-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 13:12:28 UTC