# Airworthiness Directives; McDonnell Douglas Helicopter Systems Model MD-900 Helicopters
> **Rule** · Final rule; request for comments. · Published 1999-03-03 · Effective 1999-03-18 · 64 FR 10209
## Document
- **Document number:** 99-5038
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Helicopter Systems Model MD-900
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 10209
- **Publication date:** 1999-03-03
- **Effective date:** 1999-03-18
- **FAA docket:** Docket No. 98-SW-34-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to McDonnell Douglas Helicopter Systems (MDHS) Model MD- 900 helicopters. This action requires establishing or reducing certain life limits, applying serial numbers (S/N's), determining hours time- in-service (TIS), and creating component history cards or equivalent records for various parts. This amendment is prompted by analysis that indicates a need for establishing or reducing life limits to avoid fatigue failure of certain parts. The actions specified by this AD are intended to apply appropriate life limits to various parts.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/03/03/99-5038/airworthiness-directives-mcdonnell-douglas-helicopter-systems-model-md-900-helicopters)
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