# Proposed AD FAA-2012-0216: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-22-09
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 14, 2012, 77 FR 28328
- Comments due: July 13, 2012
- Became: [AD 2012-22-09](https://openairdocs.org/ad/2012-22-09)
- Docket: FAA-2012-0216 (https://www.regulations.gov/docket/FAA-2012-0216, where comments are filed)
- Project: 2010-SW-025-AD
- FR document: 2012-11475
- Official PDF: https://openairdocs.org/files/sha256/76/d4/76d46e3581021042bac8d634b4b5981793b48367c24519e0358e0ce2e65c8d9f (from https://www.govinfo.gov/content/pkg/FR-2012-05-14/pdf/2012-11475.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/05/14/2012-11475/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A9A4B28F9DDF2443862579FE00481596.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0216

## Summary

We propose to adopt a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters, which 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 proposed AD is prompted by the discovery of cracks in T/R pylons. The proposed 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 the doubler on the aft shear deck tunnel assembly to prevent failure of the T/R pylon or other T/R components, and subsequent loss of control of the helicopter.

## Notices in this docket

- May 14, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-11475, comments due Jul 13, 2012 (https://www.federalregister.gov/documents/2012/05/14/2012-11475/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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