TASK 72-60-28-200-003 Generator Drive Gear - Examine, Inspection-003

DMC:V2500-A0-72-60-2801-00A-300A-C|Issue No:004.00|Issue Date:2020-08-01

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 72-60-28-200-003 Generator Drive Gear - Examine, Inspection-003

Effectivity

FIG/ITEM

PART NO.

01-410

4P0207

General

This TASK gives the procedure for the inspection of the IDG drive gear.

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 70-20-00-200-501.

All the parts must be cleaned before any part is examined. Refer to the SPM TASK 70-10-00-100-501.

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

The procedure for those parts which must have a crack test is given in Step. Do the test before the part is visually examined.

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 should 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 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.

References

Refer to the SPM for data on these items:

Definitions of Damage, SPM TASK 70-02-02-350-501, Record and Control of the Lives of Parts, SPM TASK 70-05-00-220-501, Inspection of Parts, SPM TASK 70-20-00-200-501.

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

Method of Testing for Crack Indications, Chemical Processes, Surface Protection.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Workshop inspection equipmentLOCALWorkshop inspection equipment
Magnetizing unitLOCALMagnetizing unit
Demagnetizing unitLOCALDemagnetizing unit
Hardness TesterLOCALHardness Tester

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-60-28-240-053 Examine the IDG Drive Gear (01-410) for Cracks

    1. Clean the part. Refer to TASK 72-60-28-100-000 (CLEANING-000).

      2. Do the crack test on the part that is given below.

        PART IDENT

        PROCEDURE

        CURRENT/INSPECT

        TASK/SUBTASK

        IDG drive gear

        TB

        600 amps

        SUBTASK 70-24-01-240-011

        TB

        1700 amps

        SUBTASK 70-24-01-240-011

        TB

        2400 amps

        SUBTASK 70-24-01-240-011

        Coil

        7000 A/T

        SUBTASK 70-24-01-240-014

        1. Cracked

        1. Reject

    2. SUBTASK 72-60-28-220-073 Examine the IDG Drive Gear (01-410) Gear Teeth at Location 1

    1. Refer to Figure.

      2. Nicks on the tip of tooth.

        1. Three for each tooth 0.032 in. (0.80 mm) long, 0.008 in. (0.20 mm) in depth, extended less than 0.016 in. (0.40 mm) on to face of tooth. The distance between nicks must be equal to, or larger than the length of the longest nick

        1. Accept

        2. More than Step

        1. Repair VRS5161, TASK 72-60-28-300-018 (REPAIR-018)

      3. Damage on the contact surface.

        1. Superficial damages

        1. Repair VRS5161, TASK 72-60-28-300-018 (REPAIR-018)

      4. Chips, flakes or fretting

      1. Reject

      5. Wear of teeth

        1. Measure the dimension of the 47 teeth spur gear over the diametrically opposite 0.1969 in. (5.000 mm) diameter pins.

          1. Between 5.0065 and 4.9973 in. (127.166 and 126.931 mm)

          1. Accept

          2. Less than 4.9973 in. (126.931 mm)

          1. Reject

        2. Measure the dimension of the 67 teeth spur gear over the diametrically opposite 0.1969 in. (5.000 mm) diameter pins.

          1. Between 7.0020 and 6.9925 in. (177.852 and 177.610 mm)

          1. Accept

          2. Less than 6.9925 in. (177.610 mm)

          1. Reject

      6. NOTE

        Do this check only if overheating or some other condition makes it necessary. A blue discoloration of the part is an indication of overheating.

        Hardness of teeth.

        1. Measure the hardness of teeth at location 2.

          1. Less than 56 HRC measured at different locations

          1. Reject

        2. Measure the hardness of gear area adjacent to teeth at location 3.

          1. Less than 30 HRC measured at different locations

          1. Reject

    3. SUBTASK 72-60-28-220-074 Examine the IDG Drive Gear (01-410) Rear Bearing Shoulder at Location 4

    1. Refer to Figure.

      2. Runout.

        1. In 0.001 in. (0.025 mm) in relation to surfaces A and B

        1. Accept

        2. More than Step

        1. Repair VRS5166, TASK 72-60-28-300-023 (REPAIR-023)

    4. SUBTASK 72-60-28-220-075 Examine the IDG Drive Gear (01-410) Rotating Ring Journal (Reference No. 4012)

    1. Refer to Figure.

      2. Diameter.

        1. Between 2.0866 and 2.0854 in. (53.000 and 52.970 mm)

        1. Accept

        2. Less than 2.0854 in. (52.970 mm)

        1. Repair VRS5165, TASK 72-60-28-300-022 (REPAIR-022)

      3. Concentricity.

        1. In 0.002 in. (0.050 mm) in relation to surfaces A and B

        1. Accept

        2. More than in Step

        1. Repair VRS5165, TASK 72-60-28-300-022 (REPAIR-022)

    5. SUBTASK 72-60-28-220-076 Examine the IDG Drive Gear (01-410) Spline at Location 5

    1. Refer to Figure.

      2. Spline teeth.

        1. Superficial damages

        1. Repair VRS5161, TASK 72-60-28-300-018 (REPAIR-018)

        2. Chips, flakes or fretting

        1. Reject

      3. Wear of teeth.

        1. Measure the dimension between the diametrically opposite 0.1080 in. (2.743 mm) diameter pins.

          1. Between 1.4719 and 1.4763 in. (37.386 and 37.497 mm)

          1. Accept

          2. More than 1.4763 in. (37.497 mm)

          1. Reject

    6. SUBTASK 72-60-28-220-077 Examine the IDG Drive Gear (01-410) Rear and Front Bearing Journals (Reference No. 4009 and 4011)

    1. Refer to Figure.

      2. Damage on the surface.

        1. Scratches not more than 0.008 in. (0.2 mm) in depth

        1. Repair VRS5161, TASK 72-60-28-300-018 (REPAIR-018)

        2. Scratches more than 0.008 in. (0.2 mm) in depth

        1. Repair VRS5163, TASK 72-60-28-300-020 or (REPAIR-020) Repair VRS5164, TASK 72-60-28-300-021 (REPAIR-021)

    7. SUBTASK 72-60-28-220-078 Examine the IDG Drive Gear (01-410) Rear Bearing Journal (Reference No.4009)

    1. Refer to Figure.

      2. Diameter.

        1. Between 2.1275 and 2.1268 in. (54.039 and 54.020 mm)

        1. Accept

        2. Less than 2.1268 in. (54.020 mm)

        1. Repair VRS5164, TASK 72-60-28-300-021 (REPAIR-021)

      3. Runout.

        1. In 0.001 in. (0.025 mm) in relation to surfaces A and B

        1. Accept

        2. More than Step

        1. Repair VRS5164, TASK 72-60-28-300-021 (REPAIR-021)

    8. SUBTASK 72-60-28-220-079 Examine the IDG Drive Gear (01-410) Front Bearing Shoulder at Location 6

    1. Refer to Figure.

      2. Runout.

        1. In 0.001 in. (0.025 mm) in relation to surfaces A and B

        1. Accept

        2. More than Step

        1. Repair VRS5162, TASK 72-60-28-300-019 (REPAIR-019)

    9. SUBTASK 72-60-28-220-080 Examine the IDG Drive Gear (01-410) Front Bearing Journal (Reference No. 4011)

    1. Refer to Figure.

      2. Diameter.

        1. Between 1.7733 and 1.7727 in. (45.042 and 45.026 mm).

        1. Accept

        2. Less than 1.7727 in. (45.026 mm).

        1. Repair VRS5163, TASK 72-60-28-300-020 (REPAIR-020)

      3. Runout.

        1. In 0.001 in. (0.025 mm) in relation to surfaces A and B

        1. Accept

        2. More than Step

        1. Repair VRS5163, TASK 72-60-28-300-020 (REPAIR-020)

    10. SUBTASK 72-60-28-220-122 Examine the IDG Drive Gear (01-410) Gearshaft Surfaces at Location 7

    1. Refer to Figure.

      2. Damage on the surface.

        1. Surface damage not more than 0.008 in. (0.20 mm) in depth.

        1. Repair VRS5161, TASK 72-60-28-300-018 (REPAIR-018).

    11. SUBTASK 72-60-28-220-123 Examine the IDG Drive Gear (01-410) Sealing Surfaces at Location 8

    1. Refer to Figure.

      2. Damage on the coupling sealing surface.

        1. Surface damage not more than 0.005 in. (0.13 mm) in depth if damage does not go fully across sealing land.

        1. Repair VRS5161, TASK 72-60-28-300-018 (REPAIR-018).

    12. Figure: Locations on the IDG Drive Gear

    Locations on the IDG Drive Gear

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised procedural steps. (15VC725)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Demagnetizing unit
Tool Name:Demagnetizing unit
Manufacturer Code:LOCAL
Tool Number:Hardness Tester
Tool Name:Hardness Tester
Manufacturer Code:LOCAL
Tool Number:Magnetizing unit
Tool Name:Magnetizing unit
Manufacturer Code:LOCAL
Tool Number:Workshop inspection equipment
Tool Name:Workshop inspection equipment