Airworthiness Directives; Lockheed Model L-1011-385-1 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Lockheed Model L-1011-385-1 series airplanes, that requires modification of the power drive units and the lower drive sprocket assemblies of the galley lift system. This amendment is prompted by a report indicating that, due to fatigue cracking, the primary and secondary drive shafts of the galley lift failed and caused the galley lift to drop to the lower level, injuring a flight attendant. The actions specified by this AD are intended to prevent such fatigue cracking of the primary and secondary drive shafts, which could result in complete fracturing of the secondary shaft; such fracturing could allow the galley lift to drop to the bottom of the shaft, and could result in possible injury to crewmembers.