Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Piper Aircraft Corporation (Piper) Model PA-46-350P airplanes. The proposed action would require installing to the right of the manifold pressure gauge in full view of the pilot a placard that specifies manifold pressure limits, and incorporating a revision into the Limitations section of the Pilots' Operating Handbook (POH). After recent review of the Piper Model PA-46- 350P powerplant data, the Federal Aviation Administration (FAA) determined that certain manifold pressure limitations should be incorporated. These limitations fall outside the normal continuous operation range of the engine, and therefore testing was not performed in this area during original type certification. The actions specified by the proposed AD are intended to prevent fatigue damage to the propeller caused by operating above certain manifold pressure limits.