TASK 72-00-00-200-803 Engine General - Examine Engines Removed From Service Because Of Bearing Spall Or Outer Ring Fracture Or Planned Shop Visit For No. 3 Bearing Removal Or HPC Stub Shaft Surgical Strike, Special Procedures-003

DMC:V2500-A0-72-00-0000-01A-300A-B|Issue No:001.00|Issue Date:2014-05-01

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 72-00-00-200-803 Engine General - Examine Engines Removed From Service Because Of Bearing Spall Or Outer Ring Fracture Or Planned Shop Visit For No. 3 Bearing Removal Or HPC Stub Shaft Surgical Strike, Special Procedures-003

General

This TASK gives the procedure for the inspection for debris in engines removed from service because of bearing spall, outer ring fracture or shop visit for No. 3 bearing removal or HPC stub shaft surgical strike.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

WARNING

DO NOT REMOVE THE FILLER CAP OF THE OIL TANK IMMEDIATELY AFTER ENGINE OPERATION. LET THE OIL PRESSURE DECREASE FOR A MINIMUM OF FIVE MINUTES AFTER ENGINE SHUTDOWN. IF YOU OPEN THE FILLER CAP WHEN THERE IS PRESSURE IN THE TANK, THE OIL CAN SERIOUSLY BURN THE SKIN.

Procedure

    1. SUBTASK 72-00-00-210-071 Procedure

      1. Clean and inspect engines removed from service.

      1. Do a thorough cleaning and inspection of areas that are contaminated with debris.

      2. Do a thorough cleaning and inspection of components.

        NOTE

        IAE recommends that the shops give more detailed work instructions into local work instructions to make sure that all oil-wetted components, tubes, housings, intermediate case strut cavities and external oil system components (fuel-cooled oil cooler (FCOC), air-cooled oil cooler (ACOC), etc.) are thouroughly cleaned and inspected to make sure they have no debris before you return bearing-event engines to service.

      2. Do the following steps on engines that are in the shop for No. 3 bearing spall or fracture, or as a planned shop visit for No. 3 bearing removal or HPC stub shaft rework:

      1. Clean the hardware by aqueous spray cleaning given in TASK 70-11-03-300-503.

      2. Examine all cavities and surfaces for debris. Clean again if necessary.

      3. Clean and inspect heat exchanger components such as the FCOC and ACOC by the instructions given in their Component Maintenance Manuals to make sure there is no debris between oil-wetted surfaces.

        NOTE

        IAE recommends that engines which have a No.3 bearing outer ring fracture or bearing spall have a more thourough oil system flush at test. IAE recommends that the shops incorporate the flush instructions into local work instructions.

      3. Do the steps that follow to flush the engine during test:

      1. Run the engines at IDLE for 15 minutes.

      2. Shut down the engine.

      3. Fully drain the oil system, TASK 71-00-00-600-002.

        4. Remove and examine the pressure and scavenge filters, TASK 72-00-60-050-010 and TASK 72-00-60-050-011.

        1. Clean all viscous deposits from the filter housings and ports.

        2. Examine the filter to make sure you can use it in the engine flush operation.

      5. Fill the oil system with new engine oil, TASK 71-00-00-600-002.

      6. Operate the engines at ground idle for 10 minutes.

      7. Fully drain the oil system, TASK 71-00-00-600-002.

        8. Examine the magnetic chip detectors (MCDs), and the pressure and scavenge filters, TASK 72-00-00-200-008.

        1. If you find metallic debris on MCDs, do Fault Isolation.

        2. Clean off non-magnetic deposits from the MCDs and install them again.

      9. Fill the oil system with new engine oil, TASK 71-00-00-600-002.

      10. Operate the engine at ground idle for 10 minutes.

      11. Check the oil for unwanted particles. If there are unwanted particles in the oil, do Step thru Step again.

Requirements After Job Completion

Follow-On Conditions

NONE