Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all McDonnell Douglas MD-90-30 series airplanes. This proposal would require revising the Airworthiness Limitations Section of the Instructions for Continued Airworthiness [MD-90-30 Airworthiness Limitations Instructions (ALI)] to incorporate certain replacement times for safe-life limited parts. This proposal is prompted by analysis of data that identified reduced replacement times for certain safe-life limited parts. The actions specified by the proposed AD are intended to prevent fatigue cracking of various safe-life limited parts; such fatigue cracking could adversely affect the structural integrity of these airplanes.