AD/AE 3007/3 - High Pressure Turbine Wheel (Cth)

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 39.1 (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.

Rolls Royce (Allison) Turbine Engines - AE 3007 Series

AD/AE 3007/3 High Pressure Turbine Wheel 10/2004

Applicability: Rolls-Royce Corporation (formerly Allison Engine Company) models AE3007A and AE 3007C turbofan engines with 2nd stage HPT wheels with SN's prior to MM183060.

Requirement: 1. Unless previously accomplished perform a one-time acid etch inspection to the 2nd stage high pressure turbine wheel in accordance with the Accomplishment Instructions contained in the following Rolls-Royce Alert Service Bulletins listed in Table 1 of this Directive.

Table 1.

AE models Rolls-Royce service bulletin AE 3007A AE 3007A-A-72-179, Revision 2, dated October 17, 2000 or Revision 3, dated June 19, 2001. AE 3007C AE 3007C-A-72-153, Revision 2, dated October 17, 2000 or Revision 3, dated June 19, 2001.

2. If damage is discovered, replace the turbine wheel with a serviceable part.

3. Do not install any 2nd-stage gas-generator turbine wheel listed in Table 2 of this Directive, unless it has been inspected as specified in Requirement 1 of this Directive.