TASK 71-00-00-700-022 Test No 22 (A1) - Restore EGT Margin On In-Service Engines, Testing-022

DMC:V2500-A1-71-00-0000-08A-320A-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

V2500-A1

Common Information

TASK 71-00-00-700-022 Test No 22 (A1) - Restore EGT Margin On In-Service Engines, Testing-022

General

This TASK gives the procedure for the removal of the HPT vane plugs on the ACC valve to restore EGT margin on in-service engines.

This TASK should be completed only if performance data monitoring shows the EGT has increased by 68 deg F (20 deg C) relative to an initial level determined from new or overhauled engines.

Do this procedure if the EGT margin cannot be recovered through the troubleshooting procedures, core engine wash, or there is not sufficient EGT margin to operate the in-service engine.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 71-00-00-050-051 Remove the HPT/LPT ACC Air Valve

    1. Remove the ACC air valve. Refer to TASK 72-00-40-050-002, (Removal-12).

    2. SUBTASK 71-00-00-770-051-A00 Remove the Plugs from the HPT Vane on the ACC Valve and Install the Plugs in the Plug Storage Plate

    1. Refer to Figure and Figure.

    2. CAUTION

      THE ENGINE LIFE AND PERFORMANCE CAN BE ADVERSELY AFFECTED IF THE REMOVAL PLUGS ON THE VANE OF THE ACTIVE CLEARANCE CONTROL (ACC) VALVE ARE REMOVED FOR REASONS OTHER THAN THE REQUIREMENTS TO RESTORE EGT MARGIN AS GIVEN FROM THE ENGINE PERFORMANCE DATA.

      Remove the four nuts, washers, screws (plugs) and bushings from the HPT vane on the ACC valve (Ref Figure).

    3. Install the bushings (4 off), screws (plugs) (4 off), washers (4 off) and nuts (4 off) in the four holes located on the ACC valve plug storage plate.

    4. Torque the four nuts to 10.0 to 11.5 lbf.in (1.13 to 1.30 Nm).

      5. Identify the ACC valve to the new part number given in Figure.

      1. Remove the numbers that exist in the specified areas on the identification plate. Use a deburring tool or equivalent.

      2. Lightly vibration peen or scribe the correct data on the identification plate in the specified areas.

    3. SUBTASK 71-00-00-770-051-B00 Remove the Plugs from the Plug Storage Plate and Install the Plugs in the HPT Vane on the ACC Valve

    1. Refer to Figure and Figure.

    2. Remove the four nuts, washers, screws (plugs) and bushings from the plug storage plate of the ACC valve (Ref Figure).

    3. Install the bushings (4 off), screws (plugs) (4 off), washers (4 off) and nuts (4 off) in the four holes located on the HPT vane in the ACC valve.

    4. Torque the four nuts to 10.0 to 11.5 lbf.in (1.13 to 1.30 Nm).

      5. Identify the ACC valve identification plate to the new part number given in Figure as follows:

      1. Remove the numbers that exist in the specified areas on the identification plate. Use a deburring tool or equivalent.

      2. Lightly vibration peen or scribe the correct data on the identification plate in the specified areas.

    4. SUBTASK 71-00-00-450-052 Install the HPT/LPT ACC Air Valve

    1. Install the ACC air valve. Refer to TASK 71-00-00-420-007-A00, (Installation-10 CONFIG-1).

    5. Figure: Active clearance control (ACC) valve plug position

    Active clearance control (ACC) valve plug position

    Figure: Active clearance control (ACC) valve part number identification

    Active clearance control (ACC) valve part number identification

Requirements After Job Completion

Follow-On Conditions

NONE