Airworthiness Directives; Aerospatiale Model ATR42-200, ATR42- 300, and ATR42-320 Series Airplanes

Resumo

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Aerospatiale Model ATR42-300 and ATR42-320 series airplanes, that currently requires inspections to determine the proper installation of rivets in certain key holes and to detect cracks in the area of the key holes where rivets are missing; and correction of discrepancies. This action would increase the compliance time for the existing requirements and expand the applicability of the existing AD to include additional airplanes. This action also would require various inspections of the subject area for discrepancies, and corrective actions, if necessary; and replacement of certain cargo door hinges with new hinges. For certain airplanes, this action would also require replacement of friction plates, stop fittings, and bolts with new parts. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent fatigue cracks of the cargo door skin, certain frames, and entry door stop fittings and friction plates, which could result in reduced structural in