# Proposed AD FAA-2014-0493: Sikorsky Aircraft Corporation (Sikorsky) Model Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-11-10
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 23, 2014, 79 FR 42719
- Comments due: September 22, 2014
- Became: [AD 2015-11-10](https://openairdocs.org/ad/2015-11-10)
- Docket: FAA-2014-0493 (https://www.regulations.gov/docket/FAA-2014-0493, where comments are filed)
- Project: 2013-SW-019-AD
- FR document: 2014-17334
- Official PDF: https://openairdocs.org/files/sha256/cb/53/cb53b0893eccc752b287514fde6301a42f64c671f4b6460f2dc49c2d0e5a27c3 (from https://www.govinfo.gov/content/pkg/FR-2014-07-23/pdf/2014-17334.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/07/23/2014-17334/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1E220004CB01668186257D1E004D9A76.0001
- Page: https://openairdocs.org/proposed/FAA-2014-0493

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Sikorsky Model S-92A helicopters. This proposed AD would require installing a main gearbox (MGB) failed pump sensor and vacuum switch wiring, installing an MGB oil auto bypass system, activating Aircraft Management System (AMS) 7.1 software to show a new visual warning, and installing updated enhanced ground proximity warning system (EGPWS) software that includes an aural annunciation of a complete oil pressure loss condition. This proposed AD would also require inserting a Rotorcraft Flight Manual (RFM) Supplement into the applicable RFM. This proposed AD is prompted by investigation results of in-service oil leakage incidents. The proposed actions are intended to alert and prevent MGB oil loss, which could lead to failure of the MGB and subsequent loss of control of the helicopter.

## Notices in this docket

- Jul 23, 2014: Notice of proposed rulemaking (NPRM). (first notice), FR document 2014-17334, comments due Sep 22, 2014 (https://www.federalregister.gov/documents/2014/07/23/2014-17334/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-helicopters)

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