Airworthiness Directive · Amendment 39-9866 · Various Airplanes
Various Airplanes
Superseded. A later AD replaced this one: AD 99-20-01, AD 99-20-02. Comply with the one in force.
This AD applies to Various F.28 Mark 0070, F.28 Mark 0100.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an existing airworthiness directive (AD), applicable to all Fokker Model F28 Mark 0070 and 0100 series airplanes, that currently requires a revision to the Airplane Flight Manual (AFM) that will enable the flightcrew to determine if the thrust reversers are properly stowed and locked prior to take-off. In addition, the existing AD requires a revision to the maintenance program to incorporate instructions to perform checks of the thrust reverser system and correct thrust reverser malfunctions. That AD was prompted by results of a review, which indicated that a potential latent failure of the secondary lock actuator 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. This new AD adds a requirement to accomplish new modifications that will serve as terminating actions for the revisions to the AFM and maintenance program, and new repetitivechecks of the thrust reverser system. The actions specified in this AD are intended to ensure protection against inadvertent deployment of the thrust reversers during flight.
