Airworthiness Directive · Amendment 39-9926 · AlliedSignal Inc. TFE731 Series Turbofan Engines
AlliedSignal Inc. TFE731 Series Turbofan Engines
AlliedSignal Inc. Models TFE731-2A, -3C and -3CR series turbofan engines, with first stage low pressure turbine (LPT) seal plates, Part Number (P/N) 3073552-2 and P/N 3074053-1, installed on but not limited to the following aircraft: Cessna Model 650 Citation III and Israel Aircraft Industries Model 1125 Westwind Astra aircraft.
This amendment adopts a new airworthiness directive (AD), applicable to AlliedSignal Inc. TFE731 series turbofan engines, that requires removal from service of certain first stage low pressure turbine (LPT) seal plates prior to accumulating the new, reduced cyclic life limit, and replacement with serviceable LPT seal plates. This amendment is prompted by a report that the machined LPT seal plate geometry did not meet the design intent due to drawing ambiguity. The actions specified by this AD are intended to prevent fatigue cracking and subsequent uncontained failure of an LPT seal plate.
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.
Engines
