Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Fokker Model F28 Mark 0100 series airplanes. This proposal would require an inspection to determine the adequacy of clearance between the normal maximum (second) detent for the reverse thrust control and the surrounding moving parts and to detect chafing or damage of the detent. This proposal would also require eventual replacement of the normal maximum detent with an improved detent. This proposal is prompted by a report indicating that an inadequate level of clearance between the normal maximum detent and the surrounding parts may exist on earlier production Model F28 Mark 0100 series airplanes. The actions specified by the proposed AD are intended to ensure proper operation of the normal maximum detent for reverse thrust control.