Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain PILATUS Aircraft Ltd. (Pilatus) Model PC-7 airplanes. This proposed AD would require you to inspect the forward and aft dihedral fittings for cracks and replace any cracked fitting. This proposed AD would also require you to modify the aft dihedral fitting and spar-cap bolt holes. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this proposed AD are intended to prevent cracks from developing in the forward and aft dihedral fittings, which could result in failure of the wing in certain maneuvers. Such failure could lead to loss of control of the airplane.