Summary
We propose to adopt a new airworthiness directive (AD) for certain Piper Aircraft, Inc. (Piper) Models PA-46-350P, PA-46R-350T, and PA-46-500TP airplanes. This proposed AD would require you to install a stall warning heat control modification kit. This proposed AD results from ice forming on the stall vane heater during flights into icing conditions with the landing gear down. We are proposing this AD to prevent ice from forming on the stall vane, which may result in failure of the stall warning system. This failure could result in the pilot being unaware of an approaching stall situation.