# Airworthiness Directives; McDonnell Douglas Helicopter Systems Model 369F and 369FF Helicopters
> **Rule** · Final rule. · Published 1998-04-02 · Effective 1998-05-07 · 63 FR 16109
## Document
- **Document number:** 98-8584
- **Category:** airworthiness
- **Manufacturer:** McDonnell Douglas Helicopter Systems Model 369F and 369FF
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 16109
- **Publication date:** 1998-04-02
- **Effective date:** 1998-05-07
- **FAA docket:** Docket No. 97-SW-03-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to McDonnell Douglas Helicopter Systems (MDHS) Model 369F and 369FF helicopters, that requires removing the tail rotor control rod assembly (rod assembly) and replacing it with an airworthy rod assembly. This amendment is prompted by a failure of a rod assembly during a proof-load test conducted by the manufacturer. The actions specified by this AD are intended to prevent buckling of the rod assembly when subjected to ultimate jam loads, loss of tail rotor control, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/04/02/98-8584/airworthiness-directives-mcdonnell-douglas-helicopter-systems-model-369f-and-369ff-helicopters)
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