Airworthiness Directives; The New Piper Aircraft, Inc. Models PA- 46-310P and PA-46-350P Airplanes

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This document proposes to revise Airworthiness Directive (AD) 99-15-04, which currently requires calibrating the turbine inlet temperature system to assure the accuracy of the existing turbine inlet temperature indicator and wiring on all The New Piper Aircraft, Inc. (Piper) Models PA-46-310P and PA-46-350P airplanes, and repairing or replacing any turbine inlet temperature system that fails the calibration test. AD 99-15-04 also requires repetitively replacing the turbine inlet temperature probe on the Model PA-46-350P airplanes, and inserting a copy of the AD into the Pilot's Operating Handbook (POH) of certain airplanes. Since AD 99-15-04 became effective, the Federal Aviation Administration (FAA) has determined that the AD should not apply to airplanes where the factory installed turbine inlet temperature gauge and associated probe have been replaced through supplemental type certificate (STC). The proposed AD retains the actions of AD 99-15-04, and restricts the applicability accordingly. The actions specified by the proposed AD are intended to prevent improper engine operation caused by improperly calibrated turbine inlet temperature indicators or defective turbine inlet temp