FAA is banning more than 4,200 older Cessna twin pistons from flight into known icing, a move the agency says is necessary because the aircraft were not certified for such operations and have exhibited unusual flight characteristics when encountering icing. The airworthiness directive (AD) will require either keeping a supplemental airplane flight manual/airplane flight manual supplement (SAFM/AFMS) inside the airplane or installing a placard that prohibits flight into known icing ...
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