Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes, that requires replacement of the actuating ram bobbin and O-ring seals of the main landing gear (MLG) with new bobbins and improved O-ring seals. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent loss of dampening of the MLG actuating ram, which could result in failure of the MLG lockstruts, and consequent structural damage to the airplane.