# Proposed AD FAA-2021-0189: Various Restricted Category Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-26-16
- Products: Arrow Falcon Exporters Inc.; Global Helicopter Technology, Inc.; Hagglund Helicopters, LLC; JJASPP Engineering Services, LLC.; Northwest Rotorcraft, LLC; Overseas Aircraft Support, Inc.; Richards Heavylift Helo, Inc.; Rotorcraft Development Corporation; Southwest Florida Aviation International, Inc.; and Tamarack Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 26, 2021, 86 FR 16126
- Comments due: May 10, 2021
- Became: [AD 2021-26-16](https://openairdocs.org/ad/2021-26-16)
- Docket: FAA-2021-0189 (https://www.regulations.gov/docket/FAA-2021-0189, where comments are filed)
- Project: AD-2020-00645-R
- FR document: 2021-05561
- Official PDF: https://openairdocs.org/files/sha256/84/56/8456fdb8db5458ec1eeec5a16a2d107071923394567db0f9ce9f9c124b4e6dd9 (from https://www.govinfo.gov/content/pkg/FR-2021-03-26/pdf/2021-05561.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/03/26/2021-05561/airworthiness-directives-various-restricted-category-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8C73962879DDC54A862586A4007B302E.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0189

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for type certificated Model UH-1H restricted category helicopters. This proposed AD was prompted by multiple reports of failure of the main driveshaft. This proposed AD would require establishing a life limit for certain main driveshafts, and a one-time and repetitive inspections of the main driveshafts. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 26, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-05561, comments due May 10, 2021 (https://www.federalregister.gov/documents/2021/03/26/2021-05561/airworthiness-directives-various-restricted-category-helicopters)

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