Airworthiness Directives; Fokker Model F28 Mark 0070 and 0100 Series Airplanes

Samenvatting

This document publishes in the Federal Register an amendment adopting airworthiness directive (AD) 96-24-10 that was sent previously to all known U.S. owners and operators of Fokker Model F28 Mark 0070 and 0100 series airplanes by individual notices. This amendment supersedes an existing AD, but retains the requirement of that AD to incorporate a revision to the Airplane Flight Manual that will enable the flightcrew to determine if the thrust reversers are properly stowed and locked prior to take-off. This new AD also requires a new revision to the maintenance program to incorporate certain instructions related to checks of the thrust reverser system. This new AD allows dispatch of the airplane, under certain conditions, with both thrust reversers inoperative. This action is prompted by results of a review, which indicated that a potential latent failure of the secondary lock switch 1 of the thrust reverser system in the open position may occur, in addition to the potential failure of the secondary lock relay 1 in the energized position, which was addressed by the existing AD. The actions specified by this AD are intended to prevent such failures, which could result in reduced prot