Airworthiness Directives; Fokker Model F.28 Mark 0070 and 0100 Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Fokker Model F.28 Mark 0070 and 0100 series airplanes. This action requires revising the applicable airplane flight manual to provide the flightcrew with more restrictive procedures for operating in icing conditions. This action is necessary to ensure that the flightcrew is aware of the procedures required to prevent ice from contacting the ice impact panels on the engine fan case. Such contact could result in a panel coming loose during flight and blocking the bypass flow through the engine outlet guide vanes, and consequent reduction of the engine thrust, resulting in insufficient thrust to maintain flight. This action is intended to address the identified unsafe condition.