Repair of the Fan Case - VRS1824 - PRE SBE 72-0160 [IAE]

TASK 72-32-85-350-015-A
Repair of the Fan Case - VRS1824 - PRE SBE 72-0160

CAUTION: SILICON CARBIDE TYPE WHEELS, STONES AND ABRASIVE PAPERS ARE TO BE USED FOR THIS REPAIR. ALUMINUM OXIDE TYPES MUST NOT BE USED.

CAUTION: THE MATERIAL WILL OXIDIZE AND CRACK IF MECHANICAL CUTTERS ARE USED HEAVILY. THIS HAS OCCURRED IF THE COMPONENT SHOWS DARK STRAW TO BLUE DISCOLORATION. IF AT ANY TIME THIS COLORATION OCCURS THE CASES MUST BE REJECTED

CAUTION: THE FAN CASE IS MADE FROM TITANIUM ALLOY AND IS THIN IN SOME AREAS. IF YOU BLEND TOO MUCH, THE PART CANNOT BE SERVICEABLE AND WILL HAVE TO BE REPLACED.

CAUTION: DO NOT OPERATE WITHOUT SAFETY GOGGLES AND OTHER GUARD EQUIPMENT. FLYING PARTICLES CAN CAUSE INJURY.

ZONE: 400
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 1M(3 FT)
No specific	AR	BRUSH - WIRE, ROTARY
No specific	AR	MACHINE - HAND GRINDING, PNEUMATIC
No specific	AR	MAT - WORK
No specific	AR	THICKNESS MEASURING EQUIPMENT - ULTRASONIC
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V05-020)	waterproof silicon carbide
(Material No.V05-021)	Waterproof silicon carbide abrasive paper

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

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 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Blend Repair of the Fan Case

3. Job Set-up
Subtask 72-32-85-941-080-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 72-32-85-010-072-A ** ON A/C NOT FOR ALL

B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 72-32-85-040-055-A ** ON A/C NOT FOR ALL

C. Deactivate 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 72-32-85-010-073-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

Subtask 72-32-85-941-081-A ** ON A/C NOT FOR ALL

E. Put the Support Equipment in to Position
(1) Put the ACCESS PLATFORM 1M(3 FT) in to position to give access to the engine.
(2) Put the MAT - WORK in to position in the fan case.

NOTE: Make sure that the red warning pennants of the workmat can be seen externally.

NOTE: Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the fan case.

4. Procedure
Subtask 72-32-85-350-060-A ** ON A/C NOT FOR ALL

A. General Instructions for the Blend Repair of the Fan Case

Blend Repair of the Fan Case ** ON A/C NOT FOR ALL

(1) Use the MACHINE - HAND GRINDING, PNEUMATIC, the BRUSH - WIRE, ROTARY and the Waterproof silicon carbide abrasive paper (Material No.V05-021) to blend the burred, galled and scored area and remove all damage.

NOTE: The blend ratio, lenght to depth, must be a minimum of 50 to 1.

NOTE: Remove the minimum quantity of material necessary to remove all damage.

NOTE: All repaired areas must be have a surface finish that is of equal or better quality than that of the adjacent area.

NOTE: The maximum surface area for each blend is 4.00 in.2 (2580.64 mm2). The maximum number of blends on the inner and the outer surfaces of the containment area is 20.

(2) Polish the blended areas with waterproof silicon carbide (Material No.V05-020) to make the blended surface as smooth as the initial surface.

Subtask 72-32-85-350-061-A ** ON A/C NOT FOR ALL

B. Blend Repair the Fan Case

Blend Repair of the Fan Case ** ON A/C NOT FOR ALL

(1) The maximum blend depth on the flange, location 1, is 0.010 in. (0.254 mm).
(2) The maximum blend depth on the outer and inner surfaces, locations 2 and 3, is 0.010 in. (0.254 mm). This does NOT include the containment areas, location 7, 8 and 9.
(3) The maximum blend depth on the hook, location 4, is 0.010 in. (0.254 mm).
(4) Blends are permitted in the straight area of the flexible ring, locations 5, only if the wall thickness does not go below the minimum.

NOTE: The wall thickness can be measured with the THICKNESS MEASURING EQUIPMENT - ULTRASONIC.

NOTE: Make sure that ultrasonic wall thickness measuring equipment was calibrated by the necessary procedures given in operation manuals of the measuring equipment or local regulations. Calibration piece to be made from the same material (Ti-6Al-4V) or a material with the same acoustic velocity as the part to be tested. The calibration piece thickness must be within the thickness limits of the part to be measured,

Blend Repair of the Fan Case ** ON A/C NOT FOR ALL

(5) The maximum blend depth on the other surface of the flexible ring, locations 5, is 0.010 in. (0.254 mm).
(6) The maximum blend depth on the groove, location 6, is 0.005 in. (0.13mm).
(7) Blending is permitted in the corner and containment areas, Locations 7, 8 and 9 only if the minimum wall thickness can be maintained.

NOTE: In addition to that, maximum depth to remove the damage on the corner, Location 7 must not be more than 0.005 in. (0.13 mm).

NOTE: Thickness can be measured using an ultrasonic wall thickness measuring equipment.

Blend Repair of the Fan Case ** ON A/C NOT FOR ALL

Subtask 72-32-85-220-052-A ** ON A/C NOT FOR ALL

C. Examine the Blend Repaired Area

Blend Repair of the Fan Case ** ON A/C NOT FOR ALL

(1) Measure the dimentions of the blended areas
(a) The maximum area for each blend is 4.00 in.2 (2580.64 mm2). The maximum number of blends on the inner and outer surfaces of the containment area is 20.
(b) The blended area must be agree with the minimum blend ratio. The blend ratio, length to depth, must be a minimum of 50 to 1.

5. Close-up
Subtask 72-32-85-942-071-A ** ON A/C NOT FOR ALL

A. Remove the Ground Support Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the workmat from the fan case.
(3) Remove the access platform(s).

Subtask 72-32-85-410-074-A ** ON A/C NOT FOR ALL

B. Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-32-85-440-055-A ** ON A/C NOT FOR ALL

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

Subtask 72-32-85-410-075-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:45:32 UTC