Boeing Proposes Supersession of Airworthiness Directive for 747-100 to 747SR Series Airplanes Powered by JT9D-3 and JT9D-7 Engines

Summary

Boeing is proposing to replace an existing airworthiness directive with a new one for certain 747-100 to 747SR series airplanes powered by Pratt & Whitney JT9D-3 and JT9D-7 engines, aiming to prevent cracking of the vertical chords adjacent to the lower spar fitting and subsequent separation of the strut and engine from the airplane.