Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to all Aerospatiale Model ATR72 series airplanes, that would have required a revision to the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate inspections to detect fatigue cracking in certain structure, inspection intervals, and life limits for certain components. That proposal was prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. This new action revises the proposed rule to require the incorporation of revised and new inspections and life limits. The actions specified by this new proposed AD are intended to ensure that fatigue cracking of certain structural elements is detected and corrected; such fatigue cracking could adversely affect the structural integrity of these airplanes.