Airworthiness Directive · Amendment 39-9571 · Boeing Model 747-400 Series Airplanes Powered by General Electric CF6-80C2 or Pratt & Whitney PW4000 Series Engines
Boeing Model 747-400 Series Airplanes Powered by General Electric CF6-80C2 or Pratt & Whitney PW4000 Series Engines
Model 747-400 series airplanes powered by General Electric CF6-80C2 or Pratt & Whitney PW4000 series engines; as identified in Boeing Alert Service Bulletin 747-28A2185, Revision 1, dated September 21, 1995, and Boeing Service Bulletin 747-28- 2146, dated August 13, 1992; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-400 series airplanes, that requires modification of the engine fuel feed system. This amendment is prompted by reports indicating that the coupling nut on the fuel tube on the outboard strut (engine position 1) fractured. The actions specified by this AD are intended to prevent such fracturing of the coupling nut, which could result in release of fuel onto the engine cowling and a subsequent fire.
