# Airworthiness Directives; Hughes Helicopters, Inc., and McDonnell Douglas Helicopter Systems (Type Certificate Is Currently Held by MD Helicopters, Inc.) Helicopters
> **Rule** · Final rule. · Published 2013-03-26 · Effective 2013-04-30 · 78 FR 18226
## Document
- **Document number:** 2013-06746
- **Category:** airworthiness
- **Manufacturer:** Hughes
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 18226
- **Publication date:** 2013-03-26
- **Effective date:** 2013-04-30
- **FAA docket:** Docket No. FAA-2012-0890
## Abstract

We are adopting a new airworthiness directive (AD) for MD Helicopters, Inc. (MDHI) Model 369D, 369E, 369F, and 369FF helicopters with certain serial-numbered tailboom assemblies. This AD requires measuring the distance between aft longeron rivets and the outboard edge of frame rings. If the distance is too short to ensure a safe flight, the AD requires installing a doubler. This AD was prompted by the discovery of short-edge margin conditions on two tailboom assemblies. The actions are intended to detect a short-edge margin condition, prevent failure of the tailboom and loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/03/26/2013-06746/airworthiness-directives-hughes-helicopters-inc-and-mcdonnell-douglas-helicopter-systems-type)
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