Airworthiness Directive · Amendment 39-9182 · AlliedSignal Aerospace GTCP85 Series Auxiliary Power Units
AlliedSignal Aerospace GTCP85 Series Auxiliary Power Units
AlliedSignal Aerospace (formerly Garrett Auxiliary Power Division and Garrett Turbine Engine Co.) GTCP85 series auxiliary power units (APU's) with model numbers listed in AlliedSignal Aerospace Service Bulletin (SB) No. GTCP85-49-6919, Revision 1, dated January 15, 1995, except those APU's installed on Boeing 737 and British Aerospace BAC 1-11 series aircraft; and Alert Service Bulletin (ASB) No. GTCP85-49-A6831, Revision 1, dated January 15, 1995, having a one-piece cast turbine rotor with part numbers (P/N) 3842072-1, -2, -3, and P/N 3604604-1, -2, -3, P/N 3606982-1, and P/N 96895-1 through -8. These APU's are installed on but not limited to Boeing 707 series and 727 series aircraft; Lockheed L382 series aircraft; and McDonnell Douglas DC-8-70 series and DC-9/MD-80 series aircraft.
This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal Aerospace (formerly Garrett Auxiliary Power Division and Garrett Turbine Engine Co.) GTCP85 series auxiliary power units (APU), that requires modifying the APU to install an exhaust centerbody. This amendment is prompted by reports of two uncontained APU failures where turbine wheel fragments exited the APU exhaust axially and damaged the aircraft. The actions specified by this AD are intended to prevent an axially uncontained APU failure and damage to the aircraft.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Appliances and equipment
