# Proposed AD FAA-2010-0720: Sikorsky Aircraft Corporation (Sikorsky) Model S-92A Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Withdrawn
- Products: Sikorsky
- Product type: Aircraft
- Action: Proposed rule; withdrawal.
- Published: March 15, 2021, 86 FR 14293
- Comments due: March 14, 2021
- Docket: FAA-2010-0720 (https://www.regulations.gov/docket/FAA-2010-0720, where comments are filed)
- Project: 2010-SW-050-AD
- FR document: 2021-05194
- Official PDF: https://openairdocs.org/files/sha256/1c/40/1c406a6fc7e70965c5f5d53600b7b43c96fb7d38ed75feaac9d1b88f373750fb (from https://www.govinfo.gov/content/pkg/FR-2021-03-15/pdf/2021-05194.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/03/15/2021-05194/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DA505B79FB0A26AC8625869A0079C535.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0720

## Summary

The FAA is withdrawing a notice of proposed rulemaking (NPRM) that proposed to adopt a new airworthiness directive (AD) that would have applied to certain Sikorsky Model S-92A helicopters. The NPRM was prompted by a fatigue analysis conducted after a helicopter was found with a severed main gearbox (MGB) mounting foot pad (foot pad) that failed due to fatigue. The NPRM would have required revising the airworthiness limitations section of the existing Instructions for Continued Airworthiness (ICA) for your helicopter to reduce the life limit of the MGB housing and replacing any MGB housing that exceeds the life limit. Since issuance of the NPRM, the FAA has determined that the affected MGB housings are no longer in service. Accordingly, the NPRM is withdrawn.

## Notices in this docket

- Jul 21, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-17756, comments due Sep 20, 2010 (https://www.federalregister.gov/documents/2010/07/21/2010-17756/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-s-92a-helicopters)
- Mar 15, 2021: Proposed rule; withdrawal., FR document 2021-05194, comments due Mar 14, 2021 (https://www.federalregister.gov/documents/2021/03/15/2021-05194/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-helicopters)

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