# Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters
> **Rule** · Final rule; request for comments. · Published 2004-11-22 · Effective 2004-12-07 · 69 FR 67805
## Document
- **Document number:** 04-25542
- **Category:** airworthiness
- **Manufacturer:** MD
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 69 FR 67805
- **Publication date:** 2004-11-22
- **Effective date:** 2004-12-07
- **FAA docket:** Docket No. FAA-2004-19613
## Abstract

This amendment adopts a new airworthiness directive (AD) for the MD Helicopters, Inc. (MDHI) Model MD900 helicopters. This action requires reducing the life limit of certain Notar fan system tension- torsion (TT) straps. This action also requires, at a specified time interval, removing each affected TT strap from the helicopter, doing a visual and x-ray inspection, and replacing any unairworthy part before further flight. Reporting the discovery of any unairworthy TT strap is also required. This amendment is prompted by two recent in-flight TT strap failures. The actions specified in this AD are intended to prevent failure of a TT strap resulting in loss of directional control and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/11/22/04-25542/airworthiness-directives-md-helicopters-inc-model-md900-helicopters)
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