# Proposed AD 99-SW-02-AD: Bell Helicopter Textron-manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P Helicopters; and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-25-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 16, 1999, 64 FR 18845
- Comments due: June 15, 1999
- Became: [AD 99-25-12](https://openairdocs.org/ad/99-25-12)
- Docket: 99-SW-02-AD
- FR document: 99-9510
- Official PDF: https://openairdocs.org/files/sha256/03/08/03087f60ee83530ad7430a3a284bf0c447fb24d45707fabf72595cd9ab094de3 (from https://www.govinfo.gov/content/pkg/FR-1999-04-16/pdf/99-9510.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/04/16/99-9510/airworthiness-directives-bell-helicopter-textron-manufactured-model-hh-1k-th-1f-th-1l-uh-1a-uh-1b
- Page: https://openairdocs.org/proposed/99-SW-02-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to Bell Helicopter Textron (Bell)-manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH- 1F, UH-1H, UH-1L, and UH-1P helicopters; and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 helicopters that currently requires modification and inspections of the tailboom vertical fin spar (vertical fin spar). This action would require the same modification and inspections plus two additional inspections, and replacement of the vertical fin spar. This proposal is prompted by 2 accidents involving fatigue cracks in the vertical fin spar that have occurred since the issuance of AD 97-20-09. The actions specified by the proposed AD are intended to prevent in-flight failure of the vertical fin spar and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 16, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-9510, comments due Jun 15, 1999 (https://www.federalregister.gov/documents/1999/04/16/99-9510/airworthiness-directives-bell-helicopter-textron-manufactured-model-hh-1k-th-1f-th-1l-uh-1a-uh-1b)

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