TASK 72-60-21-300-030 Main Gearbox Casing - Repair The Support Bushings Of The Main Gearbox Casing - Repair-030 (VRS5295)

DMC:V2500-A0-72-60-2101-17A-664A-C|Issue No:005.00|Issue Date:2019-11-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 72-60-21-300-030 Main Gearbox Casing - Repair The Support Bushings Of The Main Gearbox Casing - Repair-030 (VRS5295)

Effectivity

FIG/ITEM

PART NO.

02-050

4B0053

02-050

4B0054

02-050

4B0055

02-050

4B0057

02-050

4B0400

02-050

4B0402

02-050

4B0423

Material of component

PART IDENT

SYMBOL

MATERIAL

Gearbox casing

-

Aluminum alloy

Bushing

-

Stainless steel

General

NOTE

Consumable materials are given in the PCI.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Arbor PressLOCAL
Bore GageLOCAL
Boring machineLOCAL
Drilling equipmentLOCAL
FreezerLOCAL
Fluorescent penetrant inspection equipmentLOCALFluorescent Penetrant Inspection Equipment
Hot Air GunLOCAL
Vibrating Marking PencilLOCALVibrating Marking Pencil
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NONE

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
BushLOCAL4P01282
BushLOCAL4P01282
BushLOCAL4P01282

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-21-320-176 Remove the Support Bushes of the Main Gearbox Casing

    1. Refer to Figure and Figure.

    2. Remove the support bushes.

    3. Use appropriate tools.

    2. SUBTASK 72-60-21-220-188 Inspect the Bores of the Support Bushes

    1. Refer to Figure and Figure.

      2. Inspect the diameter G of the bores of the casing.

        1. Scratches, scores and other damages are not allowed.

        1. If necessary, machine the bore to remove any damage.

        2. Remove the minimum amount of material to remove the damage.

      2. The maximum bore diameter allowed is 0.8256 in. (20.970 mm).

        3. If the diameter G is more than Step.

        1. Repair, VRS5709 TASK 72-60-21-300-057 (REPAIR-057).

    3. SUBTASK 72-60-21-220-189 Measure the Bores of the Support Bushes

    1. Refer to Figure, Figure and Figure.

    2. Measure and record the diameter G.

    3. Use a bore gage.

    4. Select the bushing.

      5. If the diameter G is not more than 0.8256 in. (20.970 mm), install the bush 4P0128.

      1. The interference fit with the bore diameter G is 0.0016 in. to 0.004 in. (0.040 mm to 0.10 mm).

    4. SUBTASK 72-60-21-350-207 Install the Bushing

      NOTE

      The difference in temperature between the parts must be less than 250 deg F (120 deg C).

    1. WARNING

      DO NOT TOUCH THE HOT PARTS WITHOUT PROTECTIVE GLOVES.

      WARNING

      HOT PARTS CAN CAUSE REDDENING AND BLISTERING OF THE SKIN IF THE HANDS ARE NOT PROTECTED.

      WARNING

      IMMERSE THE CONTACTED AREA IN COLD WATER FOR 10 MINUTES IF THE SKIN IS BURNED. IMMEDIATELY GET MEDICAL ATTENTION IF THE PAIN OR BLISTERING PERSIST.

      Refer to Figure.

      2. Use the hot air gun and/or the freezer to Increase the temperature of the housing and/or decrease the temperature of the bushing.

      1. Make sure the temperature of the aluminum housing is not more than 250 deg F (120 deg C).

      2. Make sure that the temperature of the bushing is not less than -58 deg F (-50 deg C).

      3. Install the bushing into the machined bore.

      1. Use protective gloves.

      2. Use an arbor press, a drift and a guide pin.

      3. Give sufficient back-up support at the bushing bore area to prevent housing distortion when you install the bushing.

    4. CAUTION

      INSTALL THE BUSHING IN THE MACHINED BORE IMMEDIATELY AFTER REMOVAL FROM THE FREEZER, OTHERWISE THE BUSHING CANNOT BE CORRECTLY INSTALLED.

      Let the part get to room temperature.

    5. Remove the drift and the guide pin.

    5. SUBTASK 72-60-32-320-087 Machine the Inner Diameter of the Bushings

    1. Refer to Figure and Figure.

      2. Use drilling equipment to line ream the inner holes of the bushings.

      1. The final dimension must be 0.62559 in. to 0.62630 in. (15.890 mm to 15.908 mm).

    6. SUBTASK 72-60-21-350-208 Identify the Repair

      1. Make a mark VRS5295 adjacent to the part number.

      1. Refer to SPM TASK 70-09-00-400-501, SUBTASK 70-09-00-400-001.

    7. Figure: Repair Details and Dimensions

    Repair Details and Dimensions

    Figure: Repair Details and Dimensions

    Repair Details and Dimensions

    Figure: Repair Details and Dimensions

    Repair Details and Dimensions

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised figures. (19VC356)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Link not Found
Manufacturer Code:LOCAL
Tool Number:Vibrating Marking Pencil
Tool Name:Vibrating Marking Pencil
Manufacturer Code:LOCAL
Tool Number:Workshop inspection equipment
Tool Name:Workshop inspection equipment
Link not Found