# Proposed AD FAA-2008-0442: Various Sikorsky-Manufactured Transport and Restricted Category Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-20-12
- Products: Sikorsky
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (SNPRM); reopening of comment period.
- Published: October 8, 2014, 79 FR 60789
- Comments due: December 8, 2014
- Became: [AD 2015-20-12](https://openairdocs.org/ad/2015-20-12)
- Docket: FAA-2008-0442 (https://www.regulations.gov/docket/FAA-2008-0442, where comments are filed)
- Project: 2007-SW-24-AD
- FR document: 2014-23585
- Official PDF: https://openairdocs.org/files/sha256/75/7d/757d9de02b80396c3a1d92993a5f4c0de2fcf02160ec7f29ce967674f3d3a053 (from https://www.govinfo.gov/content/pkg/FR-2014-10-08/pdf/2014-23585.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/10/08/2014-23585/airworthiness-directives-various-sikorsky-manufactured-transport-and-restricted-category-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A3D0F96D88CD14A86257D6B004B2BFF.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0442

## Summary

We are revising an earlier proposed airworthiness directive (AD) for certain Sikorsky Aircraft Corporation (Sikorsky) Model S-61A, D, E, L, N, NM (serial number 61454), R, and V; Croman Corporation Model SH-3H, Carson Helicopters, Inc., Model S-61L; Glacier Helicopters, Inc. Model CH-3E; Robinson Air Crane, Inc. Model CH-3E, CH-3C, HH-3C, and HH-3E; and Siller Helicopters Model CH-3E and SH-3A helicopters. This SNPRM is prompted by comments received in response to a previous SNPRM and a reevaluation of the relevant data. This SNPRM retains the proposed actions in the previous SNPRM, provides an increased estimated cost of the main rotor shaft (MRS) replacement, and clarifies some of the language in the Required Actions section of the AD. The proposed actions are intended to prevent MRS structural failure, loss of power to the main rotor, and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 22, 2008: Notice of proposed rulemaking (NPRM).
----------------------------------------------------------------------- (first notice), comments due Jun 22, 2008 (https://drs.faa.gov/browse/excelExternalWindow/9E555CB46DF5AA088625743400584922.0001)
- Apr 25, 2013: Supplemental notice of proposed rulemaking (SNPRM); reopening of comment period., FR document 2013-09767, comments due Jun 24, 2013 (https://www.federalregister.gov/documents/2013/04/25/2013-09767/airworthiness-directives-various-sikorsky-manufactured-transport-and-restricted-category-helicopters)
- Oct 8, 2014: Supplemental notice of proposed rulemaking (SNPRM); reopening of comment period., FR document 2014-23585, comments due Dec 8, 2014 (https://www.federalregister.gov/documents/2014/10/08/2014-23585/airworthiness-directives-various-sikorsky-manufactured-transport-and-restricted-category-helicopters)

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