# Airworthiness Directives; Bell Helicopter Textron Inc.-Manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 Helicopters
> **Rule** · Final rule. · Published 2000-08-09 · 65 FR 48605
## Document
- **Document number:** 00-20186
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 48605
- **Publication date:** 2000-08-09
- **FAA docket:** Docket No. 2000-SW-01-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that applies to Bell Helicopter Textron Inc. (BHTI)-manufactured Model HH- 1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 helicopters. This AD requires removing and replacing certain main rotor mast (mast) assemblies. This AD is prompted by a BHTI-manufactured Model UH-1B accident due to fatigue failure of a thin-wall mast installed on the helicopter. The actions specified by this AD are intended to prevent fatigue failure of the mast and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/08/09/00-20186/airworthiness-directives-bell-helicopter-textron-inc-manufactured-model-hh-1k-th-1f-th-1l-uh-1a)
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