# Proposed AD FAA-2012-0340: Sikorsky Aircraft Corporation Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-22-13
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 29, 2012, 77 FR 18969
- Comments due: May 29, 2012
- Became: [AD 2012-22-13](https://openairdocs.org/ad/2012-22-13)
- Docket: FAA-2012-0340 (https://www.regulations.gov/docket/FAA-2012-0340, where comments are filed)
- Project: 2011-SW-073-AD
- FR document: 2012-7541
- Official PDF: https://openairdocs.org/files/sha256/de/ef/deefcc5bf959a42902d535f0feab7eddfc382480e4fe0ce6c57de60c96983e8d (from https://www.govinfo.gov/content/pkg/FR-2012-03-29/pdf/2012-7541.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/03/29/2012-7541/airworthiness-directives-sikorsky-aircraft-corporation-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5D1B71042F66F14E862579D0004FBF07.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0340

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-76C helicopters. This proposed AD is prompted by a bird-strike to the windshield that resulted in unintended movement of the engine control levers from the forward position and towards the flight-idle position, which reduced power on both engines. These actions are intended to prevent unintended movement of the ECLs, resulting in main rotor speed decay and subsequent loss of control of the aircraft.

## Notices in this docket

- Mar 29, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-7541, comments due May 29, 2012 (https://www.federalregister.gov/documents/2012/03/29/2012-7541/airworthiness-directives-sikorsky-aircraft-corporation-helicopters)

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