TASK 72-00-00-300-008 N1 Speed/Trim Probe and/or NF Harness Replacement - Project Visit Maintenance - Repair-008 (VRS3829)

DMC:V2500-A5-72-00-0000-03A-664A-B|Issue No:002.00|Issue Date:2018-02-01

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 72-00-00-300-008 N1 Speed/Trim Probe and/or NF Harness Replacement - Project Visit Maintenance - Repair-008 (VRS3829)

General

This procedure outlines the requirements to replace the N1 Speed/Trim Probes and/or the NF Harness from the No. 2 Bearing Support Assembly.

It is not intended to be utilized for normal shop visits for the purpose of scheduled engine/module overhaul or refurbishment where a full on-wing interval is expected. This procedure alone does not permit any engine to be zero-timed (time since LEVEL 3 maintenance).

All AD notes that are applicable and affected need to be accomplished, as well as any mandated inspections in the Engine Manual Airworthiness Limitations Section (ALS) and Maintenance Scheduling Section (MSS) of the Instructions for Continued Airworthiness (ICA), located in the Time Limits Manual (Chapter 05-10-00) of the Engine Manuals, to include required enhanced inspection of selected critical life-limited parts at each piece part exposure.

Preliminary Requirements

Pre-Conditions

Action/ConditionData Module/Technical Publication
Engine does not require any reduced interval inspections.
Engine must pass operator C-check borescope inspection limits or equivalent Engine Manual borescope inspection requirements.

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

  1. The proprietary nature of this repair requires that any facility not authorized to accomplish this repair contact the IAE Repair Development Group to determine if a qualification program can be initiated at their facility.

    IAE International Aero Engines AG

    400 Main Street

    M/S 121-10

    East Hartford CT 06118

    U.S.A.

    Attn: Manager Technical Services

    2. Remove the LPT Module and the TEC as a unit from the Engine by TASK 72-00-50-020-002.

      1. If the LPT Module/TEC will be assembled to the same HPT Assembly from which it was removed, then following interface inspections by EM TASK 72-00-50-220-001 are not required.

      1. SUBTASK 72-00-50-220-072 - Front Flange of the LP Turbine Case at Location 4.

      2. SUBTASK 72-00-50-220-075 - Air Seal Diameter at the Inner Duct Segment at Location 8.

      3. SUBTASK 72-00-50-220-081 - Visually Examine the Stage 3 Air Seal Ring at Location 9.

    3. Remove the following to gain access to the probes and harness mounted on the No. 2 Bearing support.

    1. LPC/Fan Module by TASK 72-00-31-020-001.

    2. LPC Booster Stage Assembly by TASK 72-32-00-030-006-D00.

    3. LPC Stub Shaft and the No. 1 Bearing Support Assembly by TASK 72-32-00-030-013-C00.

      NOTE

      Do not remove the quill shaft or the No. 3 Bearing, Internal Gearbox and Support Assembly.

    4. Perform visual check of all exposed hardware in the front section by PVM TASK 72-00-31-200-008.

    1. If the Engine was removed for trim balance failure, visually inspect the phonic wheel for pin damage, LP Stub Shaft for pin slot damage and the exposed areas of the No. 2 Bearing Inner Race attached to the stub shaft. If the Phonic wheel pin is missing, the Oil Scavenge Pump must be inspected or replaced.

      NOTE

      For abnormal conditions found in hardware within the Front Bearing Compartment, refer to applicable sections of this Engine Manual for inspection limits.

    5. Replace the N1 Speed/Trim Probes and/or the Harness, as required, from the No. 2 Bearing Support Assembly. Refer to the following:

    1. SUBTASK 72-32-10-440-106 - Select the shim.

    2. SUBTASK 72-32-10-440-107 - Replace the shims on to the mounting brackets.

    3. SUBTASK 72-32-00-430-101 - Install the NF electrical harness.

    4. SUBTASK 72-32-00-430-333 - Do an electrical resistance check for loops of the harness and the probes.

    6. Re-assemble the engine as follows:

    1. Install the LPC Stub Shaft and the No. 1 Bearing Support Assembly to the Fan Frame Assembly by SUBTASK 72-32-00-430-376.

    2. Engage the hydraulic seal with the LPC Stub Shaft by SUBTASK 72-32-00-430-377.

    3. Install the No. 1 Bearing Compartment Scavenge Oil Tube by SUBTASK 72-32-00-430-378.

    4. Prepare for evacuation check by SUBTASK 72-32-00-790-055.

    5. Do an evacuation check for leaks by SUBTASK 72-32-00-790-056.

    6. Remove the special tools for evacuation check by SUBTASK 72-32-00-790-057.

    7. Install the LPT Module and TEC by TASK 72-00-50-420-001-C00.

    8. Install the LPC Booster and the LPC Fan Module by TASK 72-32-00-430-010-D00.

    9. Build the remainder of the engine by applicable sections of the Engine Manual for testing.

Requirements After Job Completion

Follow-On Conditions

Action/ConditionData Module/Technical Publication
Engine performance must satisfy the limits of Engine Manual Test 08 and Test 12.
Post-test borescope inspection must satisfy airline C-check requirements.
Engine does not require any reduced interval inspections at re-delivery.
Upon completion of test engine requires a serviceability tag (Form 8130).
Change Type:

Editorial Change to correct link to inspection in step 4 per (16VJ808)