TASK 72-45-21-840-002 HPT Case Orifice Plate - Rework To Increase The Size Of The Opening, Rework-002 - SBE 72-0236

DMC:V2500-A0-72-45-2102-00A-933A-C|Issue No:001.00|Issue Date:2013-11-01

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 72-45-21-840-002 HPT Case Orifice Plate - Rework To Increase The Size Of The Opening, Rework-002 - SBE 72-0236

Effectivity

FIG/ITEM

PART NO.

01-100

2A3692

General

The practices and processes referred to in the procedure by the TASK number are in the SPM.

Refer to the Indicated Service Bulletin for specific application requirements.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

CAUTION

FAILURE TO INCORPORATE THE INCREASED FLOW ORIFICE AT THE FIRST OPPORTUNITY CAN RESULT IN HIGHER OPERATING TEMPERATURES IN THE AREA OF THE HIGH PRESSURE TURBINE SECOND STAGE AIR SEAL. THIS CAN LEAD TO THE LONG TERM PREMATURE REPLACEMENT OF THE AIR SEAL AND SECOND STAGE DISK DUE TO FAILURE TO MEET INSPECTION REQUIREMENTS.

Procedure

    1. SUBTASK 72-45-21-350-079 Machine the 2A3692 Orifice Plate

      1. Set up and machine to open the 0.835 to 0.845in. (21.21 to 21.46 mm) diameter to 0.870 to 0.880in. (22.10 to 22.35 mm).

      1. Refer to Figure.

    2. Hold the diameter concentric to the outside diameter in 0.010in. (0.254 mm).

    2. SUBTASK 72-45-21-350-080 Identify the Orifice Plate with the New Part Number

      1. Make a mark adjacent to the old part number to show the new part number. Use the vibration peen method.

      1. Number before - 2A3692.

        New number - 2A3734.

        Refer to the SPM TASK 70-09-00-400-501.

    3. SUBTASK 72-45-21-440-051 Install the 2A3734 Orifice Plates

      1. Install the new orifice plates.

      1. Refer to TASK 72-45-20-440-002-B00 (ASSEMBLY-002, CONFIG-002).

    4. SUBTASK 72-45-21-350-081 Identify the Case and Vane Assembly with the New Part Number

      1. After you install the orifice plates, identify the case and vane assembly with the new part number. Make a mark adjacent to the old part number to show the new part number. Use the vibration peen method.

      1. Number before - 2A1703.

        New number - 2A3215.

    5. Figure: Location of the orifice plates

    Location of the orifice plates

Requirements After Job Completion

Follow-On Conditions

NONE