Airworthiness Directive · Amendment 39-12114 · Boeing Model 747-100, -200, -300, -400, and 747SR Series Airplanes
Boeing Model 747-100, -200, -300, -400, and 747SR Series Airplanes
All Model 747-100, -100B, -100B SUD, -200B, - 200C, -200F, -300, -400, -400D, -400F, and 747SR series airplanes; certificated in any category.
This amendment adopts a new airworthiness directive (AD); applicable to all Boeing Model 747-100, -200, -300, -400, and 747SR series airplanes; that requires a one-time inspection to determine whether H-11 steel bolts are installed as attach and support bolts at the trailing edge flap transmissions, and replacement of any H-11 steel bolt with an Inconel bolt. The actions specified by this AD are intended to prevent loss of a flap transmission, which could reduce lateral controllability of the airplane.
