Airworthiness Directives; McDonnell Douglas Model DC-10-10, -15, -30, -40, and KC-10 (Military) Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas DC-10 and KC-10 series airplanes, that requires repetitive eddy current inspections to detect fatigue cracking of the pylon aft bulkhead flange, upper pylon box web, fitting radius, and adjacent tangent areas; and repair, if necessary. This amendment is prompted by fatigue cracking found in the wing pylon aft bulkheads on two airplanes. The actions specified by this AD are intended to prevent failure of the wing pylon aft bulkhead due to fatigue cracking, which could lead to separation of the engine and pylon from the airplane.