Airworthiness Directive · Amendment 39-9993 · Boeing Model 747-100, -200, and -300 Series Airplanes
Boeing Model 747-100, -200, and -300 Series Airplanes
Model 747-100, -200, and -300 series airplanes; as listed in Boeing Alert Service Bulletin 747-33A2252, dated August 1, 1996, as revised by Boeing Notice of Status Change 747-33A2252 NSC 01, dated October 10, 1996; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-100, -200, and -300 series airplanes, that requires replacement of certain switches in the cabin attendant's panel at door 4 right and door 2 right with new improved switches. This amendment is prompted by reports indicating that fires have occurred on some airplanes due to the internal failure of some of these switches. The actions specified by this AD are intended to prevent the installation and use of switches that could short circuit when they fail, and consequently cause fire and smoke aboard the airplane.
