# Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
> **Rule** · Final rule. · Published 2012-11-15 · Effective 2012-12-20 · 77 FR 68061
## Document
- **Document number:** 2012-26907
- **Category:** airworthiness
- **Manufacturer:** Sikorsky
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 68061
- **Publication date:** 2012-11-15
- **Effective date:** 2012-12-20
- **FAA docket:** Docket No. FAA-2012-0216
## Abstract

We are adopting a new airworthiness directive (AD) for the Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires inspecting the tail rotor (T/R) pylon for a loose or missing fastener, a crack, damage, or corrosion and adding an internal doubler to the aft shear deck tunnel assembly. This AD was prompted by the discovery of cracks in T/R pylons. The actions are intended to detect a loose or missing fastener, a crack, damage, or corrosion on the T/R pylon and, if present, to repair the T/R pylon and install a doubler on the aft shear deck tunnel assembly or to replace the T/R pylon and install a doubler on the aft shear deck tunnel assembly. The actions are intended to prevent failure of the T/R pylon or other T/R components, which could lead to the loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/11/15/2012-26907/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)
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