TASK 72-60-21-300-021 Main Gearbox Casing - Repair The PMA Oil Tube Bore By Bushing, Repair-021 (VRS5294)

DMC:V2500-A0-72-60-2101-10A-664A-C|Issue No:005.00|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 72-60-21-300-021 Main Gearbox Casing - Repair The PMA Oil Tube Bore By Bushing, Repair-021 (VRS5294)

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

Price and availability - none

The practices and processes referred to in the procedure by the TASK number are in the SPM.

NOTE

Consumable materials are given in the SPM.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Arbor PressLOCALArbor press
FreezerLOCALFreezer
Magnifying GlassLOCALMagnifying Glass
OvenLOCALOven
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-21-320-134 Machine the Bore of the PMA Oil Tube in the Gearbox Casing

    1. Refer to Figure and Figure.

      2. Machine the oil tube bore.

      1. The diameter must be between 0.9830 in. to 0.9842 in. (24.97 mm to 25.00 mm) after removal of the damage.

      2. Deleted.

    2. SUBTASK 72-60-21-220-166 Examine the Gearbox Casing

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

      1. Use a magnifying glass.

    3. SUBTASK 72-60-21-330-119 Apply the Chromate Conversion Coating

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

      1. Refer to SPM TASK 70-38-02-300-503.

    4. SUBTASK 72-60-21-350-154 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.

        Make a repair bushing.

      1. Refer to Figure for details and dimensions.

      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 gearbox casing and/or decrease the temperature of the bushing.

      1. Use an oven and/or freezer.

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

      3. Do not decrease the temperature of the bushing below -58 deg F (-50 deg C).

        NOTE

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

      4. Remove the gearbox casing from the oven and/or 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 the machined bore.

      1. Use an arbor press.

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

    6. Let the parts get the ambient temperature.

    5. SUBTASK 72-60-21-320-135 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 0.82814 in. to 0.8321 in. (21.035 mm to 21.135 mm).

      2. Chamfer where necessary.

      3. Deleted.

    6. SUBTASK 72-60-21-330-120 Apply the Chromate Conversion Coating

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

      1. Refer to SPM TASK 70-38-02-300-503.

    7. SUBTASK 72-60-21-350-155 Identify the Repair

      1. Make a mark VRS5294 adjacent to the part number.

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

    8. 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:

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

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Arbor press
Tool Name:Arbor Press
Manufacturer Code:LOCAL
Tool Number:Freezer
Tool Name:Freezer
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