# Proposed AD FAA-2015-7095: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-07-09
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 30, 2016, 81 FR 59526
- Comments due: October 31, 2016
- Became: [AD 2017-07-09](https://openairdocs.org/ad/2017-07-09)
- Docket: FAA-2015-7095 (https://www.regulations.gov/docket/FAA-2015-7095, where comments are filed)
- Project: 2015-SW-085-AD
- FR document: 2016-20672
- Official PDF: https://openairdocs.org/files/sha256/9b/aa/9baa45898545c48bc4dd34386044e03766d3f8cf85bf0c2f2bdb4c04acf52bf8 (from https://www.govinfo.gov/content/pkg/FR-2016-08-30/pdf/2016-20672.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/08/30/2016-20672/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CA7030D58F9B72478625801F005240A5.0001
- Page: https://openairdocs.org/proposed/FAA-2015-7095

## Summary

We propose to adopt a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This proposed AD would require removing from service the tail gearbox center housing (housing) when it has 12,200 or more hours time-in-service (TIS). This proposed AD is prompted by fatigue analysis conducted by Sikorsky that determined the housing required a retirement life. The proposed actions are intended to prevent a crack in the housing, which could lead to loss of tail rotor drive and loss of helicopter control.

## Notices in this docket

- Aug 30, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-20672, comments due Oct 31, 2016 (https://www.federalregister.gov/documents/2016/08/30/2016-20672/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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