# Airworthiness Directives; McDonnell Douglas Model MD-90-30 Series Airplanes
> **Rule** · Final rule. · Published 1999-09-03 · Effective 1999-10-08 · 64 FR 48284
## Document
- **Document number:** 99-22922
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Model MD-90-30 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 48284
- **Publication date:** 1999-09-03
- **Effective date:** 1999-10-08
- **FAA docket:** Docket No. 98-NM-69-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all McDonnell Douglas MD-90-30 series airplanes, that requires 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 amendment is prompted by analysis of data that identified reduced replacement times for certain safe-life limited parts. The actions specified by this 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/09/03/99-22922/airworthiness-directives-mcdonnell-douglas-model-md-90-30-series-airplanes)
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