# Proposed AD FAA-2015-1008: Sikorsky Aircraft Corporation (Type Certificate Previously Held by Schweizer Aircraft Corporation)

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-23-01
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 22, 2015, 80 FR 22436
- Comments due: June 22, 2015
- Became: [AD 2015-23-01](https://openairdocs.org/ad/2015-23-01)
- Docket: FAA-2015-1008 (https://www.regulations.gov/docket/FAA-2015-1008, where comments are filed)
- Project: 2013-SW-064-AD
- FR document: 2015-09098
- Official PDF: https://openairdocs.org/files/sha256/b9/53/b953017c164ff2b48d630405149746ff9b4d71c0b9ffb5f69b3808e82339c6e8 (from https://www.govinfo.gov/content/pkg/FR-2015-04-22/pdf/2015-09098.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/04/22/2015-09098/airworthiness-directives-sikorsky-aircraft-corporation-type-certificate-previously-held-by-schweizer
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/304F972DB9D14B1E86257E2F00515AA5.0001
- Page: https://openairdocs.org/proposed/FAA-2015-1008

## Summary

We propose to adopt a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model 269A, 269A-1, 269B, 269C, 269C-1, 269D, and TH-55A helicopters. This proposed AD would require repetitively inspecting and lubricating the tail rotor (T/R) driveshaft splined fittings. This proposed AD is prompted by a report that the T/R driveshaft can disconnect due to deterioration of the splined coupling. The proposed actions are intended to detect and prevent excessive wear of the splined coupling, which could lead to failure of the T/R driveshaft and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 22, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-09098, comments due Jun 22, 2015 (https://www.federalregister.gov/documents/2015/04/22/2015-09098/airworthiness-directives-sikorsky-aircraft-corporation-type-certificate-previously-held-by-schweizer)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.