Document ID: chunk:federal_register_of_legislation:F2010L02202:body:0:p1
Version: federal_register_of_legislation:F2010L02202
Segment Type: other
Provision Reference: 
Character Range: 0–3555

AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Pratt and Whitney Turbine Engines - PW4000 Series
AD/PW4000/15  14th and 15th Stage Rubstrips  15/2010

Applicability:  Pratt and Whitney (PW) models PW4164, PW4168, and PW4168A turbofan engines, serial numbers P733301 through P733500, that have HPC inner case assembly part number (P/N) 53H272-01 installed.

                Note 1:  These engines are installed on, but not limited to Airbus Industrie A330 aeroplanes.
Requirement:    Unless previously accomplished, to prevent engine power loss during takeoff due to high pressure compressor (HPC) surge, perform the following:

                   1. Borescope-inspect in accordance with paragraphs 1.A. through 1.I of the Accomplishment Instructions, Borescope Inspection of Pratt & Whitney (PW) Alert Service Bulletin (ASB) PW4G-100-A72-170, Revision 3, dated
                   31 January 2003, using schedules in Table 1 of this AD:

                Table 1. - Installed-Engine Initial Borescope Inspection Schedule
                Accumulated engine cycles on                                                                                          Initial borescope-inspect 14th
                the effective date of this AD:                                                                                        and 15th stage rubstrips:
                 (1)  Fewer than 900 cycles-since-new (CSN) or cycles-since-refurbishment (CSR) of the HPC inner rear case assembly.   Before accumulating 1,500 CSN or CSR, whichever occurs later.
                 (2)  900 or more CSN or CSR                                                                                           Within 600 cycles-in-service (CIS) after the effective date of this AD.

                   2. Perform the applicable action as specified in the following Table 2:
                Table 2. - Borescope Inspection Results and Required Action
                Results observed at last borescope inspection:                                                                                                      Action:
                 (1)  14th stage rubstrip shows wear through to the parent material of the stator, with the circumferential length of the wear being 1.0" or more.   Remove engine from service within 250 CIS.

    (2)  15th stage rubstrip shows wear through to the parent material of the stator, with the circumferential length of the wear being 2.0" or more.     Remove engine from service within 250 CIS.
    (3)  14th stage rubstrip shows wear through to the parent material of the stator, with the circumferential length of the wear being less than 1.0".   Reinspect every 300 CIS.
    (4)  15th stage rubstrip shows wear through to the parent material of the stator, with the circumferential length of the wear being less than 2.0".   Reinspect every 300 CIS.
    (5)  Both 14th and 15th stage rubstrips show no wear through to the