Airworthiness Directives; Fokker Model F.28 Mark 0070, 0100, 1000, 2000, 3000, and 4000 Series Airplanes

This amendment supersedes an existing airworthiness directive (AD), applicable to all Fokker Model F.28 Mark 0070, 0100, 1000, 2000, 3000, and 4000 series airplanes, that currently requires a revision to the Airplane Flight Manual (AFM) that prohibits takeoff in certain icing conditions unless either a tactile inspection is performed or specific takeoff procedures are followed. This amendment requires adding a requirement, for certain airplanes, for modification of the wing leading edge ice protection system to include on-ground wing ice protection, and a new revision to the AFM. This amendment is prompted by the development of a modification that introduces a wing anti-icing system that will operate on the ground as well as in flight. The actions specified by this AD are intended to prevent takeoff with snow, ice, or frost on the critical surfaces of the airplane, which could result in reduced controllability of the airplane.