TASK 72-60-27-200-001 Starter Idler Gear - Examine, Inspection-001

DMC:V2500-A0-72-60-2701-00A-300A-C|Issue No:003.00|Issue Date:2018-08-01

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 72-60-27-200-001 Starter Idler Gear - Examine, Inspection-001

Effectivity

FIG/ITEM

PART NO.

01-140

4B0182

01-140

4P0336

General

This TASK gives the procedure for the inspection of the idler gear. For the other parts of the starter idler gear assembly, refer to TASK 72-60-27-200-000 (INSPECTION-000).

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. Refer to the SPM TASK 70-11-03-300-503

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 the SPM TASK 70-23-00-230-501. Do the test before the part is visually examined. Limits for cracks are given in the SUBTASK for each part.

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 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.

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 72-60-27-240-051 Do a Crack Test on the Idler Gear (01-040) (Magnetic)

    1. Clean the parts. Refer to the TASK 72-60-27-100-000.

    2. Do the test for cracks on the parts that are given below.

      PART IDENT

      PROCEDURE

      CURRENT/INSPECT

      TASK/SUBTASK

      Idler gear

      TB

      700 amps

      SUBTASK 70-24-01-240-011

      TB

      1500 amps

      SUBTASK 70-24-01-240-011

      Coil

      7000 A/T

      SUBTASK 70-24-01-240-014

    2. SUBTASK 72-60-27-220-051 Examine the Idler Gear (01-140) Gear Teeth at Location 1

    1. Refer to Figure.

      2. Nicks on the tip of tooth.

        1. Three for each tooth 0.032 inch (0.81 mm) long, 0.008 inch (0.20 mm) in depth, extended less than 0.016 inch (0.40 mm) onto 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, VRS5156 TASK 72-60-27-300-001 (REPAIR-001).

      3. Damage on the contact surface.

        1. Superficial damages.

        1. Repair, VRS5156 TASK 72-60-27-300-001 ( REPAIR-001).

      4. Chips, flakes or fretting.

      1. Reject.

      5. Wear of teeth.

        1. Measure the dimension over diametrically opposite 0.1969 in. (5.000 mm) diameter pins.

          1. Between 6.4015 in. and 6.3939 in. (162.597 mm and 162.406 mm).

          1. Accept.

          2. Less than 6.3920 in. (162.356 mm).

          1. Accept.

      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 area 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 72-60-27-220-052 Examine the Idler Gear (01-140) 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, VRS5160 TASK 72-60-27-300-005 (REPAIR-005).

    4. SUBTASK 72-60-27-220-053 Examine the Idler Gear (01-140) Rear and Front Bearing Journals at Location 4024 and 4026

    1. Refer to Figure.

      2. Damage on the surface.

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

        1. Repair, VRS5156 TASK 72-60-27-300-001 (REPAIR-001).

        2. Scratches more than 0.008 in. (0.20 mm) in depth.

        1. Repair, VRS5158 TASK 72-60-27-300-003 (REPAIR-003) and Repair, VRS5159 TASK 72-60-27-300-004 (REPAIR-004).

    5. SUBTASK 72-60-27-220-054 Examine the Idler Gear (01-140) Rear Journal at Location 4024

    1. Refer to Figure.

      2. Diameter.

        1. Between 1.5765 in. - 1.5769 in. (40.043 mm - 40.054 mm).

        1. Accept.

        2. Less than 1.5765 in. (40.043 mm).

        1. Repair, VRS5159 TASK 72-60-27-300-004 (REPAIR-004).

      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, VRS5159 TASK 72-60-27-300-004 (REPAIR-004).

    6. SUBTASK 72-60-27-220-055 Examine the Idler Gear (01-140) Front Bearing Shoulder at Location 5

    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, VRS5157 TASK 72-60-27-300-002 (REPAIR-002).

    7. SUBTASK 72-60-27-220-056 Examine the Idler Gear (01-140) Front Bearing Journal at Location 4026

    1. Refer to Figure.

      2. Diameter.

        1. Between 1.5769 in. and 1.5765 in. (40.054 mm and 40.043 mm).

        1. Accept.

        2. Less than 1.5765 in. (40.043 mm).

        1. Repair, VRS5158 TASK 72-60-27-300-003 (REPAIR-003).

      3. Runout.

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

        1. Accept.

        2. More than Step.

        1. Repair, VRS5158 TASK 72-60-27-300-003 (REPAIR-003).

    8. Figure: Locations - Idler Gear

    Locations - Idler Gear

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised effectivity table to add PN 4P0336. (16VF822)

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