Airworthiness Directive · Amendment 39-10180 · Pilatus Aircraft LTD Models PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4, and PC-12 Airplanes
Pilatus Aircraft LTD Models PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4, and PC-12 Airplanes
The following model and serial number airplanes, certificated in any category: --Model Pilatus Models PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4 airplanes, all serial numbers, that are equipped with a Pratt and Whitney PT6A turboprop engine; and --Model Pilatus PC-12 airplanes, all serial numbers.
This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft LTD (Pilatus) Models PC-6/B1-H2, PC-6/B2-H2, PC-6/B2-H4 airplanes and all Pilatus Model PC-12 airplanes. This AD requires amending the Limitations Section of either the airplane flight manual (AFM) or the pilot's operating handbook (POH) to prohibit the positioning of the power levers below the flight idle stop while the airplane is in flight. This AFM amendment will include a statement of consequences if the limitation is not followed. This AD results from numerous incidents and five documented accidents involving airplanes equipped with turboprop engines where the propeller beta was improperly utilized during flight. The actions specified by this AD are intended to prevent loss of airplane control or engine overspeed with consequent loss of engine power caused by the power levers being positioned below the flight idle stop while the airplane is in flight.
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.
