Repair the Cascade Assembly Surface Damage - VRS2251 [IAE]

TASK 78-32-19-300-010-A
Repair the Cascade Assembly Surface Damage - VRS2251

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	ROUTING TOOL
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-076)	Methyl Ethyl Ketone, Technical grade
(Material No.V02-099)	lint free cloth
(Material No.V05-020)	waterproof silicon carbide
(Material No.V05-021)	Waterproof silicon carbide abrasive paper
(Material No.V06-131)	marking pen
(Material No.V08-028)	adhesive, two part epoxy
(Material No.V08-050)	resin

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
Cascade Panel Assembly Surface Damage Blend Repair

3. Job Set-up
Subtask 78-32-19-941-052-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 78-32-19-010-054-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 78-32-19-040-053-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 78-32-19-010-055-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-32-19-350-050-A ** ON A/C NOT FOR ALL

A. Blend Out the Surface Damage
(1) Use a ROUTING TOOL to blend the damaged area to a ratio of 10 to 1 with a 1.00 in. (25.4 mm) minimum radius.
(2) Use the Waterproof silicon carbide abrasive paper (Material No.V05-021) 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 78-32-19-350-051-A ** ON A/C NOT FOR ALL

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

B. Apply the Resin or Adhesive

NOTE: Use either V08-028adhesive, two part epoxy or resin (Material No.V08-050) .

(1) Use manufacturer instructions to mix the V08-028adhesive, two part epoxy or the resin (Material No.V08-050) .
(2) Fill the repair area with adhesive or resin.
(3) Cure the adhesive for 60 minutes at 180 deg.F (82 deg.C). Cure the resin for 220 deg.F (93 deg.C). Use an LIGHT SOURCE - HEAT, SPARK-PROOF.

NOTE: Full cure of the V08-028adhesive, two part epoxy is not necessary. The uncured adhesive is structurally and functionally acceptable.

(4) Use the waterproof silicon carbide (Material No.V05-020) to make the adhesive or resin smooth and level with the adjacent surfaces.

Subtask 78-32-19-220-050-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-19-350-052-A ** ON A/C NOT FOR ALL

D. Identify the Repair
(1) Make a mark VRS2251 with a marking pen (Material No.V06-131) adjacent to the assembly.

5. Close-up
Subtask 78-32-19-410-053-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-19-440-052-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 78-32-19-410-054-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 78-32-19-710-052-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 03:28:17 UTC