TASK 75-24-49-990-501 Description And Operation - LPT Active Clearance Control (ACC) System, Description-001

DMC:V2500-A0-75-24-4900-00A-040A-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

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Description

  1. TASK 75-24-49-990-501 Description And Operation - LPT Active Clearance Control (ACC) System, Description-001

    1. Description

      The function of the LP Turbine Active Clearance Control System is to provide an optimum turbine blade clearance which gives a performance improvement during climb and cruise.

      The LP Turbine Active Clearance Control (LPT ACC) manifold is installed around the LP turbine. With the supports it is fixed to the LP turbine case. The LPT ACC manifold has eight tubes. They have many holes in direction on to the LP turbine case.

      The LPT ACC duct connects the LPT ACC manifold with the HP/LP ACC valve. It makes an air passage between the HP/LP ACC valve and the LPT ACC manifold. Refer to Figure, Figure, and Figure.

      The LPT ACC manifold has the subsequent primary parts:

      The tube connector

      The upper LPT ACC cooling air manifold

      The lower LPT ACC cooling air manifold

      The two support assemblies A

      The four support assemblies B

    2. Operation

      Air goes from the HP/LP ACC valve through the LPT ACC duct and through the tube connector in to the two duct assembly supports. From there the air is distributed to the eight tubes. The air bleeds through the holes of the tubes on to the LP turbine case surface to cool the case.

    2. Figure: LPT ACC Manifold

    LPT ACC Manifold

    Figure: Upper LPT ACC Cooling Air Manifold

    Upper LPT ACC Cooling Air Manifold

    Figure: Lower LPT ACC Cooling Air Manifold

    Lower LPT ACC Cooling Air Manifold