# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule. · Published 2019-07-25 · Effective 2019-08-29 · 84 FR 35814
## Document
- **Document number:** 2019-15757
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 35814
- **Publication date:** 2019-07-25
- **Effective date:** 2019-08-29
- **FAA docket:** Docket No. FAA-2016-8501
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD was prompted by fatigue analysis indicating stress concentrations, as well as the discovery of a helicopter with a crack in the station (STA) 362 frame and skin. This AD requires inspecting the main transmission forward and aft frame assemblies and adjacent skins for a crack and loose fasteners, and establishing life limits for certain frame assemblies. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/07/25/2019-15757/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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