Airworthiness Directives; Fokker Model F28 Mark 0070, 0100, 1000, 2000, 3000, and 4000 Series Airplanes

Résumé

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all Fokker Model F28 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. That action was prompted by reports of several accidents in which Fokker Model F28 series airplanes lost aerodynamic lift when attempting takeoff with ice contamination on their wings. This action would add 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 proposal is prompted by the development of a modification which introduces a wing anti-icing system that will operate on the ground as well as in flight. The actions specified by the proposed AD are intended to prevent degradation of aerodynamic lift during takeoff when icing conditions exist, which could result in reduced controllability of the airplane.