Airworthiness Directives; Aerospatiale Model ATR42-500 Series Airplanes

This amendment revises an existing airworthiness directive (AD), applicable to all Aerospatiale Model ATR42-500 series airplanes. This amendment continues to require revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness to incorporate life limits for certain items and inspections to detect fatigue cracking in certain structures. This amendment also adds information pertaining to certain material incorporated by reference. This amendment is prompted by issuance of a new revision of the "Time Limits" section of the ATR42-400/500 Maintenance Planning Document, which specifies new inspections and compliance times for inspection and replacement actions. This amendment is 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.