TASK 72-32-16-200-008 Gearbox Driven Bevel Gearshaft Bearings - Examine The Ball Bearing Assembly, Inspection-008

DMC:V2500-A0-72-32-1611-02A-300A-C|Issue No:001.00|Issue Date:2013-11-01

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 72-32-16-200-008 Gearbox Driven Bevel Gearshaft Bearings - Examine The Ball Bearing Assembly, Inspection-008

Effectivity

FIG/ITEM

PART NO.

01-600

5A0286

01-600

5A6221

General

This TASK gives the procedure for the inspection of the ball bearing assembly.

All Fig/item numbers in parentheses in the procedure agree with those used in the IPC.

The policy that is necessary for inspection is given in the SPM TASK 70-20-01-200-501.

All the parts must be cleaned before any part is examined.

All the parts must be visually examined for damage, corrosion and wear. Any defects that are not identified in the procedure must be referred to IAE.

For data on the inspection and preservation of bearings, refer to the SPM TASK 70-29-01-290-501.

Do not discard any part until you are sure there are no repairs available. Refer to the instructions in Repair before a discarded part is used again or oversize parts are installed.

Parts which must be discarded can be held although no repair is available. The repair of a discarded part could be shown to be necessary at a later date.

All the parts must be examined to make sure that all the repairs have been completed satisfactorily.

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

Bearings that are rejected must not be repaired if the cause is as follows:

They have become too hot because of a decrease of oil, the inner ring has turned on its hub, a compartment fire, or skidding.

Because of an engine failure.

References

Refer to the SPM for data on these items.

Definition of Damages, SPM TASK 70-02-02-350-501

Inspection of Parts, SPM TASK 70-20-01-200-501

Some data on these items are contained in this TASK. For more data on these items refer to the SPM.

Method of Testing for Crack Indications

Chemical Processes

Surface Protection

NOTE

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

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Rockwell A (HRA) testerLOCALRockwell A (HRA) tester
IAE 2J12625 Contact angle gage0AM53IAE 2J126251
IAE 2J12626 Contact angle gage0AM53IAE 2J12626

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-32-16-110-066 Clean the Ball Bearing and its Component (01-600)

    1. Clean the ball bearing and its component. Refer to TASK 72-32-16-100-000 (CLEANING-000).

    2. SUBTASK 72-32-16-220-009 Visually Examine the Ball Bearing (01-600) for Surface Damage

      NOTE

      Visually examine, without magnification, the bearing and its components, checking in particular for defects as shown in the SPM TASK 70-29-01-290-501.

    1. Refer to Figure.

      2. Examine the oil slits on parting face of inner rings to ensure they are open

      1. Remove any obstruction which may be present

      3. Surface damages on the raceways of inner and outer ring

      1. Reject

    3. SUBTASK 72-32-16-220-100 Examine the Ball Bearing (01-600) Diameter at Location 1 and 0505

      NOTE

      Dimensionally examine the ball bearing, refer to the SPM TASK 70-29-01-290-501.

    1. Refer to Figure.

      2. Worn at location 1.

        1. Examine the outer diameter at location 1.

          1. If the diameter is between 2.9454 and 2.9456 in. (74.813 and 74.820 mm)

          1. Accept

          2. Less than 2.9454 in. (74.813 mm)

          1. Reject

      3. Worn at location 0505.

        1. Examine the inner diameter at location 0505.

          1. If the diameter is between 1.7715 and 1.7716 in. (44.994 and 45.000 mm)

          1. Accept

          2. More than 1.7716 in. (45.000 mm)

          1. Reject

          2. Write down the dimension of the diameter.

    4. SUBTASK 72-32-16-220-102 Examine the Ball Bearing (01-600)

    1. Refer to Figure.

      2. NOTE

        Examine by two inspections from among the three inspections (Step B., C. and D.) in this subtask.

        Examine the contact angle. Use an IAE 2J12625 Contact angle gage 1 off for 5A0286. Use an IAE 2J12626 Contact angle gage 1 off or equivalent for 5A6221. Use the following formulas to calculate the contact angle.

        For 5A0286: Contact Angle = arccos (0.00175 X (720 - A)).

        For 5A6221: Contact Angle = arccos (0.00350 X B).

        A: Angle shown on the measuring ring (part of IAE 2J12625 Contact angle gage).

        B: Angle show on the weight (part of IAE 2J12626 Contact angle gage).

        1. If the contact angle is between 26 and 30 degrees

        1. Accept

        2. Other than Step

        1. Reject

      3. Examine the axial play between the inner ring and the outer ring at free condition with a 44 lbf (20 kgf) gage load on the bearing.

        1. If the play is between 0.0047 and 0.0078 in. (0.117 and 0.200 mm)

        1. Accept

        2. Other than Step

        1. Reject

      4. Examine the internal radial clearance at three locations 120 degrees apart, with a 33 lbf (15 kgf) gage load on the bearing.

        1. If the clearance is between 0.0017 and 0.0022 in. (0.043 and 0.058 mm)

        1. Accept

        2. Other than Step

        1. Reject

    5. SUBTASK 72-32-16-220-101 Do a Hardness Test the Ball Bearing (01-600)

    1. Refer to Figure.

      2. Hardness test the ball bearing at location marked H.

        1. Make sure the outer ring and inner ring shows signs of having been overheated. Use a Rockwell A (HRA) tester or equivalent.

          1. If the hardness is between HRA 81.8 and 83.4

          1. Accept

          2. Other than Step

          1. Reject

    3. Remove raised metal of the ring accepted.

    6. SUBTASK 72-32-16-110-067 Demagnetize the Ball Bearing (01-600)

      NOTE

      Demagnetize the ball bearing, refer to the SPM TASK 70-11-22-300-503.

    1. Demagnetize the bearing.

    2. Examine the bearing for residual magnetism.

    7. SUBTASK 72-32-16-620-056 Do the Preservation Procedure on the Ball Bearing (01-600)

      NOTE

      Preservate the ball bearing, refer to the SPM TASK 70-29-01-290-501.

    1. Clean the bearing by dipping in the compound.

    2. Preserve the bearing in an assembled state by dipping in the compound.

    8. Figure: Ball Bearing Assembly

    Ball Bearing Assembly

Requirements After Job Completion

Follow-On Conditions

NONE
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
Manufacturer Code:0AM53
Tool Number:IAE 2J12625
Tool Name:IAE 2J12625 Contact angle gage
Manufacturer Code:0AM53
Tool Number:IAE 2J12626
Tool Name:IAE 2J12626 Contact angle gage
Manufacturer Code:LOCAL
Tool Number:Rockwell A (HRA) tester
Tool Name:Rockwell A (HRA) tester