Airworthiness Directive · Amendment 39-9790 · Boeing Model 747-200, -300, and -400 Series Airplanes
Boeing Model 747-200, -300, and -400 Series Airplanes
Model 747-200, -300, and -400 series airplanes having cumulative line number (C/L) 696 through 1057, inclusive; equipped with Parker inboard elevator power control packages (PCP) having part numbers (P/N) 93600-5005 through -5051 inclusive, or P/ N's 327400-1001, -1003, -1005, and -1007; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-200, -300, and -400 series airplanes, that requires modification of the left and right inboard elevator servo assemblies and the hydraulic routing of the right inboard elevator power control package (PCP). This amendment is prompted by a report of an uncommanded right elevator deflection after takeoff and reports of elevator/control column bumps during landing gear retraction on these airplanes. The actions specified by this AD are intended to prevent uncommanded elevator deflection, which could result in structural damage and reduced controllability of the airplane.
