The National Transportation Safety Board has directed the Federal Aviation Administration to evaluate transport-category airplanes for adequate stall protection during ice accretion.
Safety recommendation
The National Transportation Safety Board has directed the Federal Aviation Administration to evaluate transport-category airplanes for adequate stall protection during ice accretion.
The National Transportation Safety Board (NTSB) has issued safety recommendation A-12-025, identified as CEN09MA142, addressed directly to the Federal Aviation Administration. This directive calls for a comprehensive evaluation of all U.S.-certificated transport-category airplanes that are equipped with stick pushers. The primary objective of this review is to ensure that these critical safety systems activate at an angle of attack sufficient to provide adequate stall protection when airframe ice accretions are present. By mandating this specific technical assessment, the NTSB aims to verify that existing aircraft designs maintain their intended safety margins under adverse weather conditions involving ice buildup on the airframe.