TASK 72-60-21-300-011 Main Gearbox Casing - Repair The Crank Cover Bore By Bushing, Repair-011 (VRS5278)

DMC:V2500-A0-72-60-2101-04A-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 72-60-21-300-011 Main Gearbox Casing - Repair The Crank Cover Bore By Bushing, Repair-011 (VRS5278)

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

DESCRIPTION

RR

SYMBOL

MATERIAL

Accessory gearbox

casing

A357/T61 (AMS4219)

Aluminium alloy

Bushing

-

Wrought aluminum base alloy

General

NOTE

Consumable materials are given in the SPM.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Arbor PressLOCALArbor press
FreezerLOCALFreezer
IAE 3F10356 Drift, bushing (dia 33)0AM53IAE 3F103561
Magnifying GlassLOCALMagnifying Glass
OvenLOCALOven
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NONE

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
BushingLOCAL4L70001

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-21-320-067 Machine the Crank Cover Bore in the Gearbox Casing

    1. Refer to Figure and Figure.

      2. Machine the crank cover bore.

        1. The diameter must be between 1.4945 in. to 1.4961 in. (37.960 mm to 38.000 mm) after the removal of damage.

        1. Deleted.

    2. SUBTASK 72-60-21-220-112 Examine the Gearbox Casing

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

      1. Use a magnifying glass.

    3. SUBTASK 72-60-21-330-066 Apply the Chromate Conversion Coating

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

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

    4. SUBTASK 72-60-21-350-078 Install the Bushing

    1. WARNING

      DO NOT TOUCH THE HOT PARTS WITHOUT PROTECTIVE GLOVES.
      HOT PARTS CAN CAUSE REDDENING AND BLISTERING OF THE SKIN IF THE HANDS ARE NOT PROTECTED.
      IMMERSE THE CONTACTED AREA IN COLD WATER FOR 10 MINUTES IF THE SKIN IS BURNED. IMMEDIATELY GET MEDICAL ATTENTION IF PAIN OR BLISTERING PERSISTS.

      CAUTION

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

      NOTE

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

      Refer to Figure.

    2. CAUTION

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

      Install the bushing on the IAE 3F10356 Drift, bushing (dia 33) 1 off.

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

      4. 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 -58 deg F (-50 deg C).

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

    6. Use protective gloves.

      7. Install the bushing into machined bore.

      1. Use IAE 3F10356 Drift, bushing (dia 33) 1 off and an arbor press.

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

    8. Let the parts get the ambient temperature.

    9. Remove the drift.

    5. SUBTASK 72-60-21-320-068 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 1.3799 in. to 1.3839 in. (35.050 mm to 35.150 mm). Chamfer where necessary.

        1. Deleted.

    6. SUBTASK 72-60-21-330-067 Apply the Chromate Conversion Coating

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

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

    7. SUBTASK 72-60-21-350-079 Identifiy the Repair

    1. Refer to Figure and Figure.

      2. Make a mark VRS5278 adjacent to the part number.

      1. Refer to the SPM TASK 70-09-00-400-501, SUBTASK 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:0AM53
Enterprise Name:IAE INTERNATIONAL AERO ENGINES AG
BU Name:NULL
Building:SUITE 400
Street:628 HEBRON AVENUE
City:GLASTONBURY
State:CT
Zip Code:06033
Country:USA
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
Manufacturer Code:0AM53
Tool Number:IAE 3F10356
Tool Name:IAE 3F10356 Drift, bushing (dia 33)
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