# Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Model Helicopters
> **Rule** · Final rule; request for comments. · Published 2012-11-29 · Effective 2012-12-14 · 77 FR 71087
## Document
- **Document number:** 2012-28427
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 77 FR 71087
- **Publication date:** 2012-11-29
- **Effective date:** 2012-12-14
- **FAA docket:** Docket No. FAA-2012-1206
## Abstract

We are adopting a new airworthiness directive (AD) for Sikorsky Model S-70, S-70A, and S-70C helicopters, which are restricted category helicopters derived from the military Model UH-60 helicopter. This AD would require reducing or establishing life limits for certain listed helicopter parts. This AD is prompted by a review of the United States Army's analysis of their Model UH-60 fleet, which determined it necessary to establish or reduce the life limits of certain parts. The actions are intended to prevent fatigue failure of a part and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/11/29/2012-28427/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-helicopters)
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