Repair of the Front Mount Tube Assembly - VRS1069 [IAE]

TASK 71-21-11-300-801-A
Repair of the Front Mount Tube Assembly - VRS1069

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

1. Reason for the Job
This task is for A1 POST SBE 72-0150 and A5 engines.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ABRASIVE STONE
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	FILE - FINE
No specific	AR	MAGNIFYING GLASS POWER 10X
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V05-019)	Waterproof silicon carbide abrasive paper
(Material No.V05-021)	Waterproof silicon carbide abrasive paper
(Material No.V06-064)	Fluorescent penetrant

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 70-23-05-230-010-A	Local Application of Fluorescent Penetrant Inspection
TASK 70-42-11-300-010-A	Hand Polish and Blend Procedure
TASK 71-13-00-010-010-A	Opening 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 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Repair of the Front Mount Tube Assembly

3. Job Set-up
Subtask 71-21-11-941-064-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize FADEC 1(2).

Subtask 71-21-11-010-084-A ** ON A/C NOT FOR ALL

B. Get access
(1) Open the fan cowl doors (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 71-21-11-040-065-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU)

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) Do the deactivation of the thrust reverser HCU (Ref. AMM TASK 78-30-00-040-012).

Subtask 71-21-11-010-085-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 71-21-11-350-050-A ** ON A/C NOT FOR ALL

A. Repair the front mount tube assembly. Do either a polish repair (1) or a blend repair (2) depending upon the damage depth.

Repair of the Front Mount Tube Assembly ** ON A/C NOT FOR ALL

(1) If it has nicks, dents, scratches, scores or wear up to 0.002 in. (0.05 mm) in depth in area C, do the following polish repair:
(a) Use an ABRASIVE STONE or Waterproof silicon carbide abrasive paper (Material No.V05-019) and Waterproof silicon carbide abrasive paper (Material No.V05-021) and/or a FILE - FINE and remove the high metal (Ref. AMM TASK 70-42-11-300-010).
(2) If it has nicks, dents, scratches, scores or wear up to 0.0078 in. (0.20 mm) in depth in area C, do the following blend repair:
(a) Use an ABRASIVE STONE or Waterproof silicon carbide abrasive paper (Material No.V05-019) and Waterproof silicon carbide abrasive paper (Material No.V05-021) and/or a FILE - FINE and blend to remove the damage (Ref. AMM TASK 70-42-11-300-010). The blend depth must not exceed 0.010 in. (0.25 mm). The blend-repaired area is to be 10 times the depth. Ensure no metal chips produced by blending enter the engine.
(b) Use an ABRASIVE STONE or Waterproof silicon carbide abrasive paper (Material No.V05-019) and Waterproof silicon carbide abrasive paper (Material No.V05-021) and/or a FILE - FINE, and make smooth and polish the repaired area (Ref. AMM TASK 70-42-11-300-010). The surface finish of the repaired area must be the same as the adjacent surface.
(3) After performing (1) or (2), proceed to step B.

Subtask 71-21-11-210-059-A ** ON A/C NOT FOR ALL

B. Use a MAGNIFYING GLASS POWER 10X and visually examine the repaired area. Galls, nicks, dents, pits, scratches and burrs are not permitted.

Subtask 71-21-11-230-050-A ** ON A/C NOT FOR ALL

C. Use a Fluorescent penetrant (Material No.V06-064) and do a penetrant crack test of the repaired area (Ref. AMM TASK 70-23-05-230-010). Make sure that there are no cracks on the repaired area.

Subtask 71-21-11-350-051-A ** ON A/C NOT FOR ALL

D. Identify the Repair
(1) A logbook entry is necessary when you have completed this repair. Write VRS1069 in the engine logbook.

NOTE: The front mount tube assembly repaired to this scheme, must be swab-etched and inspected as specified in the EM 712111300005(VRS1103) at the next shop visit.

5. Close-up
Subtask 71-21-11-410-078-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

[Rev.10 from 2021] 2026.04.01 02:30:10 UTC