Stop Drill the Crack on the Cascade Assembly Fairing and Blank Cascade Panel Assembly - VRS2257 [IAE]

TASK 78-32-19-300-012-A
Stop Drill the Crack on the Cascade Assembly Fairing and Blank Cascade Panel Assembly - VRS2257

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	MACHINE - DRILLING
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.V06-131)	marking pen
(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
Cascade Assembly and Blank Cascade Panel Assembly

3. Job Set-up
Subtask 78-32-19-941-054-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 78-32-19-010-058-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 78-32-19-040-055-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 78-32-19-010-059-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-32-19-350-056-A ** ON A/C NOT FOR ALL

A. Prepare the Damaged Area for Repair
(1) 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.
(2) Do a penetrant inspection to find the ends of the crack.

Subtask 78-32-19-350-057-A ** ON A/C NOT FOR ALL

B. Stop Drill the Ends of the Crack
(1) Drill a 0.140 in. to 0.160 in. (3.6 to 4.0 mm) hole at each end of the crack. Use MACHINE - DRILLING.
(2) Remove the burrs from the drilled holes.
(3) Use lint free cloth (Material No.V02-099) made moist with V01-076Methyl Ethyl Ketone, Technical grade. Rub the surfaces dry before the solvent becomes dry.

Subtask 78-32-19-350-058-A ** ON A/C NOT FOR ALL

C. Apply the Primer to the Cascade Panel Assembly Repair Area

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

(1) Use manufacturer instructions to mix the primer converter (Material No.V07-140) , and the thinner (Material No.V07-139) . Let the primer mix stand for 30 minutes.
(2) Apply the primer to the repair area.
(3) Cure the primer for two hours at 75 deg.F (24 deg.C) with an LIGHT SOURCE - HEAT, SPARK-PROOF.

NOTE: Full cure of the primer may be eliminated under repair conditions. The uncured primer is structurally and functionally acceptable.

Subtask 78-32-19-220-052-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 78-32-19-350-059-A ** ON A/C NOT FOR ALL

E. Identify the Repair
(1) Make a mark VRS2257 with a marking pen (Material No.V06-131) adjacent to the assembly.

5. Close-up
Subtask 78-32-19-410-057-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-19-440-054-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 78-32-19-410-058-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 78-32-19-710-054-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