TASK 72-60-21-300-008 Main Gearbox Casing - Repair The Bearing Mating Surface Of The IDG By Bushing, Repair-008 (VRS5289)

DMC:V2500-A0-72-60-2101-01A-664A-C|Issue No:003.00|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 72-60-21-300-008 Main Gearbox Casing - Repair The Bearing Mating Surface Of The IDG By Bushing, Repair-008 (VRS5289)

Effectivity

FIG/ITEM

PART NO.

02-050

4B0053

02-050

4B0054

02-050

4B0055

02-050

4B0057

02-050

4B0400

02-050

4B0402

Material of component

DESCRIPTION

RR

SYMBOL

MATERIAL

Accessory gearbox

casing

A357/T61 (AMS4219)

Aluminium alloy

Bushing

-

Wrought aluminium 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 3F10336 Drift, bushing (dia 67)0AM53IAE 3F103361
IAE 3F10428 Guide pin0AM53IAE 3F104281
Magnifying GlassLOCALMagnifying Glass
OvenLOCALOven
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NONE

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
Bushing4L00081

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-21-350-068 Remove the Studs

    1. Refer to Figure.

      2. Remove the studs and the lock rings.

      1. Refer to Repair, VRS5255, TASK 72-60-21-300-004.

    2. SUBTASK 72-60-21-320-057 Machine the Bearing Bore in the Gearbox Casing

    1. Refer to Figure.

      2. Machine the bearing bore.

      1. The diameter must be between 2.9118 in. to 2.9134 in. (73.960 mm and 74.000 mm) after the removal of the damage.

      2. Deleted.

      3. Blend the drain holes if necessary.

      1. Blend the sharp edges around the two drain holes.

    3. SUBTASK 72-60-21-320-058 Machine the Bearing Mating Surface in the Gearbox Casing

    1. Refer to Figure.

      2. Machine the bearing mating surface.

      1. The diameter must be between 4.6043 in. to 4.6083 in. (116.950 mm and 117.050 mm) in relation to surface Z, after the removal of the damage.

      2. Deleted.

    4. SUBTASK 72-60-21-220-108 Examine the Gearbox Casing

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

    5. SUBTASK 72-60-21-330-060 Apply the Chromate Conversion Coating

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

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

    6. SUBTASK 72-60-21-350-069 Install the Bushing

    1. Refer to Figure.

      2. Install the guide pin.

      1. Put IAE 3F10428 Guide pin 1 off in threaded hole on bearing mating surface, adjacent to machined bore.

    3. Install the bushing on the IAE 3F10336 Drift, bushing (dia 67) 1 off.

      4. 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 THE MEDICAL ATTENTION IF PAIN OR BLISTERING PERSIST.

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

      1. Use an oven and/or a 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 assembled drift and bushing below -58 deg F (-50 deg C).

      5. NOTE

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

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

      1. Use protective gloves.

      6. 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 3F10336 Drift, bushing (dia 67) 1 off and an arbor press.

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

    7. Let the parts get the ambient temperature.

    8. Remove the drift and the guide pin.

    7. SUBTASK 72-60-21-320-059 Machine the Inner Diameter of the Bushing

    1. Refer to Figure.

      2. Machine the inner diameter of the bushing.

      1. The dimension must be between 2.7553 in. to 2.7561 in. (69.985 mm to 75.004 mm). Chamfer where necessary.

      2. Deleted.

    8. SUBTASK 72-60-21-320-060 Machine the Flange Surface of the Bushing

    1. Refer to Figure.

      2. Machine the flange surface.

        The dimension must be between 4.5236 in. to 4.5315 in. (114.900 mm to 115.100 mm) in relation to surface Z.

      1. Deleted.

    9. SUBTASK 72-60-21-330-061 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.

    10. SUBTASK 72-60-21-350-070 Install the New Studs

    1. Refer to Figure.

      2. Install the new studs and the new lock rings.

      1. Refer to repair VRS5255, TASK 72-60-21-300-004.

    11. SUBTASK 72-60-21-350-071 Identify the Repair

    1. Refer to Figure.

      2. Make a mark VRS5289 adjacent to the part number.

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

    12. 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)

Link not Found
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 3F10336
Tool Name:IAE 3F10336 Drift, bushing (dia 67)
Manufacturer Code:0AM53
Tool Number:IAE 3F10428
Tool Name:IAE 3F10428 Guide pin
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