# Proposed AD FAA-2016-6640: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-21-02
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 13, 2016, 81 FR 29817
- Comments due: July 12, 2016
- Became: [AD 2016-21-02](https://openairdocs.org/ad/2016-21-02)
- Docket: FAA-2016-6640 (https://www.regulations.gov/docket/FAA-2016-6640, where comments are filed)
- Project: 2015-SW-084-AD
- FR document: 2016-11196
- Official PDF: https://openairdocs.org/files/sha256/1c/a1/1ca113b5966a586565c8430ca08aacc3c56e9c59c0b646b4773481ce3b186460 (from https://www.govinfo.gov/content/pkg/FR-2016-05-13/pdf/2016-11196.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/05/13/2016-11196/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/07CB11203B9F23BD86257FB2004F38DE.0001
- Page: https://openairdocs.org/proposed/FAA-2016-6640

## Summary

We propose to adopt a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This proposed AD would require altering the fire bottle inertia switch wiring and performing a cartridge functional test of the fire extinguishing system. This proposed AD is prompted by the inadvertent tripping of inertia-switches that has led to unintentional discharging of the fire bottles, leaving the helicopter's auxiliary power unit and engines without fire protection. The proposed actions are intended to prevent unintentional and undetected fire bottle discharges and subsequent unavailability of fire suppression in case of a fire.

## Notices in this docket

- May 13, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-11196, comments due Jul 12, 2016 (https://www.federalregister.gov/documents/2016/05/13/2016-11196/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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