Summary
This document revises an earlier proposed airworthiness directive (AD) that is applicable to certain Fokker Model F28 Mark 0100 series airplanes. That proposal would have required repetitive inspections to detect corrosion in the wheel axles of the main landing gear (MLG) sliding members; and rework of any corroded areas, an inspection to detect cracks in the wheel axles, and replacement of any cracked sliding member. That proposal was prompted by a report of failure of a MLG wheel axle during push back of an in-service airplane from the terminal. This action revises the proposed rule by providing for interim actions that may be accomplished in lieu of the repetitive inspections. This action also revises the proposed rule by requiring eventual modifications of the main wheel brake units and the MLG sliding members; when accomplished, these modifications terminate the repetitive inspections and interim actions. The actions specified by this proposed AD are intended to prevent failure of the MLG wheel axle due to problems associated with corrosion and cracking.