Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Fokker Model F28 Mark 1000, 2000, 3000, and 4000 series airplanes. This proposal would require modification of the passenger door lock warning system. This proposal is prompted by reports that the passenger door opened during flight due to an improperly locked door; additionally, the door warning signal was not sufficiently visible to alert the flight crew of this condition. The actions specified by the proposed AD are intended to ensure that the flight crew is aware of an unlocked passenger door prior to takeoff of the airplane. This condition, if not corrected, could result in inadvertent opening of the passenger door while the airplane is in flight.