TASK 72-60-21-300-031 Main Gearbox Casing - Repair The PMA Housing Bore By Bushing, Repair-031 (VRS5274)

DMC:V2500-A0-72-60-2101-18A-664A-C|Issue No:004.00|Issue Date:2021-05-01

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 72-60-21-300-031 Main Gearbox Casing - Repair The PMA Housing Bore By Bushing, Repair-031 (VRS5274)

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

Casing

Aluminum alloy

Bushing

Wrought aluminum base alloy

General

NOTE

To identify the consumable materials, refer to the PCI.

NOTE

Special tools are identified in the procedure by the primary tool number.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Arbor PressLOCALArbor press
FreezerLOCALFreezer
IAE 3F10452 Drift, Bushing (DIA 108)LOCALIAE 3F10452
Magnifying GlassLOCALMagnifying Glass
OvenLOCALOven
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NONE

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
BushingLOCAL4L00491

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-21-320-122 Machine the PMA Housing Bore in the Main Gearbox Casing

    1. Refer to Figure and Figure.

      2. Machine the bearing bore.

        1. The diameter must be between 4.4882 in. and 4.4886 in. (113.960 mm and 114.000 mm) after the removal of the damage.

        1. Deleted.

    2. SUBTASK 72-60-21-220-161 Examine the Gearbox Casing

      1. Inspect the casing for cracks in the area of the bore.

      1. Use a magnifying glass.

    3. SUBTASK 72-60-21-330-108 Apply the Chromate Conversion Coating

      1. Apply the chromate conversion coating to the machined surfaces.

    4. SUBTASK 72-60-21-350-136 Install the Bushing

    1. Refer to Figure and Figure.

    2. CAUTION

      MAKE SURE THAT THE LEAD IN CHAMFER OF THE BUSHING POINTS AWAY FROM THE DRIFT.

      Install the bushing on the IAE 3F10452 Drift, Bushing (DIA 108) 1 off.

      3. 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 THE MEDICAL ATTENTION IF PAIN OR BLISTERING PERSISTS.

        Increase the temperature of the casing and/or decrease the temperature of the assembled drift and bushing.

        1. Use an oven and/or a freezer.

        1. Do not increase the temperature of the casing above 284 deg F (140 deg C).

        2. Do not decrease the temperature of the assembled drift and bushing below minus 58 deg F (minus 50 deg C).

          NOTE

          The difference in temperature between the parts must be 216 deg F (120 deg C).

      4. Remove the casing from the oven and/or the assembled drift and bushing from the freezer.

      1. Use protective gloves.

      5. CAUTION

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

        Install the bushing into machined bore.

        1. Use IAE 3F10452 Drift, Bushing (DIA 108) and an arbor press.

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

    6. Let the parts get the ambient temperature.

    7. Remove the drift and the guide pin.

    5. SUBTASK 72-60-21-320-123 Machine the Inner Diameter of the Bushing

    1. Refer to Figure and Figure.

      2. Machine the inner diameter of the bushing.

        1. The dimension must be between 4.3307 in. and 4.3321 in. (110.000 mm and 111.035 mm).

        1. Chamfer where necessary.

        2. Deleted.

    6. SUBTASK 72-60-21-330-109 Apply the Chromate Conversion Coating

      1. Apply the chromate conversion coating to the machined surface of the bushing.

    7. SUBTASK 72-60-21-350-137 Identify the Repair

    1. Refer to Figure and Figure.

      2. Make a mark VRS5274 adjacent to the part number.

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

    8. Figure: Repair Details And Dimensions

    Sheet 1

    Legend
    Repair Details And Dimensions

    Sheet 1

    Close

    Figure: Repair Details And Dimensions

    Sheet 2

    Legend
    Repair Details And Dimensions

    Sheet 2

    Close

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Deleted grinding machine from support equipment and procedural steps. (19VF825)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Manufacturer Code:LOCAL
Tool Number:Arbor press
Tool Name:Arbor Press
Manufacturer Code:LOCAL
Tool Number:Freezer
Tool Name:Freezer
Link not Found
Manufacturer Code:LOCAL
Tool Number:Magnifying Glass
Tool Name:Magnifying Glass
Manufacturer Code:LOCAL
Tool Number:Oven
Tool Name:Oven
Manufacturer Code:LOCAL
Tool Number:Workshop inspection equipment
Tool Name:Workshop inspection equipment