Airworthiness Directive · Amendment 39-10160 · AlliedSignal Inc. (Formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft Engines
AlliedSignal Inc. (Formerly Textron Lycoming) Model T5313B, T5317A, and T53 (Military) Turboshaft Engines
AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A, and T53 series military turboshaft engines approved for installation on aircraft certified in accordance with Section 21.25 of the Federal Aviation Regulations (FAR), with accessory drive carrier assemblies, Part Numbers (P/Ns) 1-070-220- 03, 1-070-220-12, and 1-070-220-13, that were installed after November 1, 1985, and have serial numbers (S/Ns) listed in AlliedSignal Inc. Alert Service Bulletins (ASBs) No. T5313B/17A- A0092, Revision 1, dated July 1, 1997; ASB No. T53-L-13B-A0092, dated June 4, 1997; or ASB No. T53-L-703-A0092, dated June 4, 1997. These engines are installed on but not limited to Bell Helicopter Textron Model 205A-1 and 205B series helicopters, Kaman Aircraft Corporation K-1200 series helicopters, and military helicopters certified in accordance with Section 21.25 of the FAR.
This amendment adopts a new airworthiness directive (AD) that is applicable to AlliedSignal Inc. (formerly Textron Lycoming) Model T5313B, T5317A, and T53 series military turboshaft engines approved for installation on aircraft certified in accordance with Section 21.25 of the Federal Aviation Regulations (FAR). This action requires a one-time visual inspection of accessory drive carrier assemblies for affected serial numbers (S/Ns) designating a defective assembly, and if the S/N is applicable, replacement with a serviceable assembly. This amendment is prompted by a report of an N2 overspeed condition due to a defective accessory drive carrier assembly. The actions specified in this AD are intended to prevent accessory drive carrier assembly failure, which could result in an N2 overspeed and an uncontained engine failure.
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.
