Airworthiness Directives; Ayres Corporation S2R Series Airplanes

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 97-13-11, which was sent previously to known U.S. owners and operators of certain Ayres Corporation (Ayres) S2R series airplanes. This AD requires inspecting the \1/4\-inch and \5/16\-inch bolt hole areas on the lower spar caps for fatigue cracking, and replacing any lower spar cap if fatigue cracking is found. This AD results from an accident on an Ayres S2R series airplane where the wing separated from the airplane in flight. The actions specified by this AD are intended to prevent fatigue cracking of the lower spar caps, which, if not detected and corrected, could result in the wing separating from the airplane with consequent loss of control of the airplane.