AD/AL 250/86 Amdt 3 - Compressor Adaptor Coupling (Cth)

AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/AL 250/86 Amdt 2 and issues the following 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.

Allison Turbine Engines - 250 Series AD/AL 250/86 Amdt 3 Compressor Adaptor Coupling 5/2012

Applicability: Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B17, -B17B, -B17C, -B17D, -B17E, 250-C20, -C20B, -C20F, -C20J, -C20S, and -C20W series turboprop and turboshaft engines with the compressor adaptor couplings installed listed in Table 1 of this Directive.

Table 1. - Affected Compressor Adaptor Couplings Manufacturer Affected part numbers Alcor Engine Company (Alcor) P/Ns 23039791AL. 23039791AL-1/-2/-3. EXTEX Ltd. (EXTEX) A23039791. E23039791. E23039791-1/-2/-3. EH23039791. EH23039791-1/-2/-3. Rolls-Royce Corporation (RRC) 23039791-1/-2/-3. Superior Air Parts (SAP) A23039791.