TASK 72-60-21-300-020 Main Gearbox Casing - Repair The Oil Scavenge Pump Bearing Mating Surface By Flanged Bushing, Repair-020 (VRS5273)

DMC:V2500-A0-72-60-2101-09A-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 72-60-21-300-020 Main Gearbox Casing - Repair The Oil Scavenge Pump Bearing Mating Surface By Flanged Bushing, Repair-020 (VRS5273)

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

PART IDENT

SYMBOL

MATERIAL

Casing

Aluminum alloy

Flanged 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 3F10337 Drift, bushing (dia 74)0AM53IAE 3F103371
IAE 3F10428 Guide pin0AM53IAE 3F104281
Magnifying GlassLOCALMagnifying Glass
OvenLOCALOven
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NONE

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
BushLOCAL4L00231

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-21-350-132 Remove the Studs

    1. Refer to Figure and Figure.

      2. Remove the lockrings and studs in the bearing mating surface.

      1. Refer to repair VRS5255 TASK 72-60-21-300-004 (REPAIR-004).

    2. SUBTASK 72-60-21-320-118 Machine the Bearing Bore in the Gearbox Casing

    1. Refer to Figure and Figure.

      2. Machine the bearing bore.

      1. The diameter must be between 3.0614 in. and 3.0630 in. (77.760 mm and 77.800 mm) after the removal of the damage.

    3. SUBTASK 72-60-21-320-119 Machine the Bearing Mating Surface of the Gearbox Casing

    1. Refer to Figure and Figure.

      2. Machine the idler bearing mating surface.

      1. The dimensions must be between 0.0315 in. to 0.0472 in. (0.800 mm to 1.200 mm) after the removal of the damage.

    4. SUBTASK 72-60-21-220-160 Examine the Gearbox Casing

    1. Use a magnifying glass inspect the casing for cracks in the area of the bearing bore.

    5. SUBTASK 72-60-21-330-105 Apply the Chromate Conversion Coating

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

    6. SUBTASK 72-60-21-350-133 Install the Bushing

    1. Refer to Figure and Figure.

      2. Install the guide pin.

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

    3. Install the bushing on the IAE 3F10337 Drift, bushing (dia 74) 1 off.

      4. 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.

        Use an oven and/or a freezer to increase the temperature of the casing and/or decrease the temperature of the assembled drift and bushing.

      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).

    5. NOTE

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

      Use protective gloves to remove the casing from the oven and/or the assembled drift and bushing from the freezer.

      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 3F10337 Drift, bushing (dia 74) and an arbor press.

      2. 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 72-60-21-320-120 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 2.9522 in. and 2.9529 in. (74.985 mm and 75.004 mm).

    8. SUBTASK 72-60-21-320-121 Machine the Flange Surface of the Bushing

    1. Refer to Figure and Figure.

      2. Machine the flange surface of the bushing.

        1. The dimension must be between 4.7205 in. to 4.7283 in. (119.900 mm to 120.100 mm).

        1. Chamfer where necessary.

    9. SUBTASK 72-60-21-330-107 Apply the Chromate Conversion Coating

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

    10. SUBTASK 72-60-21-350-134 Install New Studs

    1. Refer to Figure and Figure.

      2. Install the new studs and the new lockrings.

      1. Refer to repair VRS5255 TASK 72-60-21-300-004 (REPAIR-004).

    11. SUBTASK 72-60-21-350-135 Identify the Repair

    1. Refer to Figure and Figure.

      2. Make a mark VRS5273 adjacent to the part number.

    12. Figure: Repair Details And Dimension

    Sheet 1

    Legend
    Repair Details And Dimension

    Sheet 1

    Close

    Figure: Repair Details And Dimension

    Sheet 2

    Legend
    Repair Details And Dimension

    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: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 3F10337
Tool Name:IAE 3F10337 Drift, bushing (dia 74)
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