Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Mitsubishi Model MU-300 airplanes. This proposal would require revising the Airplane Flight Manual (AFM) to provide pilots with certain operating procedures during icing conditions, and to limit the maximum flaps position for flight in icing conditions or landing after an icing encounter. The proposal also would require installing an ice detector, and accomplishing a corresponding AFM revision to address its operation. For certain airplanes, the proposal would require converting the airplane configuration or modifying the warning horn system of the landing gear; and revising the AFM to specify flaps 10 degrees as a normal landing flap configuration. The actions specified by the proposed AD are intended to prevent uncommanded nose-down pitch at certain flap settings during icing conditions.