Airworthiness Directive · Amendment 39-12968 · Boeing Model 747 Series Airplanes Powered by General Electric (GE) CF6-80C2 Series Engines
Boeing Model 747 Series Airplanes Powered by General Electric (GE) CF6-80C2 Series Engines
Model 747-200B, -300, -400, -400D, and -400F series airplanes powered by General Electric CF6-80C2 series engines, as listed in Boeing Alert Service Bulletin 747-54A2207, dated November 16, 2000, certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes powered by GE CF6-80C2 series engines, that requires repetitive inspections and torque checks to find discrepancies of the fasteners that attach the diagonal brace fittings of the lower spar to the inboard engine struts, and modification of the fasteners if discrepancies are found. This amendment also requires eventual modification of all the fasteners, which ends the repetitive inspections and checks. The actions specified by this AD are intended to find and fix discrepant fasteners of the diagonal brace fittings, which could result in reduced structural integrity of the diagonal brace-to-strut attachment, and possible separation of the strut and engine from the airplane. This action is intended to address the identified unsafe condition.
