Document ID: chunk:federal_register_of_legislation:F2010L02202:body:0:p3
Version: federal_register_of_legislation:F2010L02202
Segment Type: other
Provision Reference: 
Character Range: 6067–7578

of this AD.

   Terminating Action.

   Replacement of HPC inner rear case assembly with an HPC inner rear case assembly containing a Haynes 242 rear hook, including assemblies modified or replaced by PW SB No. PW4G-100-72-159, PW SB No. PW4G-100-72-187, or Chromalloy Repair Procedure 00-CFL-039-0, constitutes terminating action for the repetitive engine borescope inspections of this AD.

              Note 2:  FAA AD 2003-09-02 Amdt 39-13131 date 21 April 2003 refers.
Compliance:  For Requirement 1 - As detailed in Table 1 of this AD.

             For Requirement 2 - As detailed in Table 2 of this AD.

             For Requirement 3 - As detailed in Table 3 of this AD.
             This Airworthiness Directive becomes effective on 14 August 2010.
Background:  This AD requires operators to initially and repetitively borescope-inspect 14th and 15th stage rubstrips located on the 13th and 14th stage stator set for wear.  This AD is prompted by reports of high pressure compressor (HPC) surges during the takeoff phase of flight that have been attributed to increased stage 14 and stage 15 HPC blade tip clearances caused by excessive wear on the HPC inner rear case rear hook.  The actions specified by this AD are intended to prevent engine power loss during takeoff due to HPC surge.

             From a review of State of Design ADs, CASA has determined that this AD may be applicable to Australian aircraft.

David Punshon
Delegate of the Civil Aviation Safety Authority

28 July 2010