# Proposed AD FAA-2016-6968: Sikorsky Aircraft Corporation Helicopters (Type Certificate Previously Held by Schweizer Aircraft Corporation)

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-14-06
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 5, 2017, 82 FR 1267
- Comments due: March 6, 2017
- Became: [AD 2017-14-06](https://openairdocs.org/ad/2017-14-06)
- Docket: FAA-2016-6968 (https://www.regulations.gov/docket/FAA-2016-6968, where comments are filed)
- Project: 2015-SW-020-AD
- FR document: 2016-31622
- Official PDF: https://openairdocs.org/files/sha256/88/d3/88d3ddaaceee18ffa6ba2d201912d880435ecf45fb2d6a627f4245ebcd15d20b (from https://www.govinfo.gov/content/pkg/FR-2017-01-05/pdf/2016-31622.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/01/05/2016-31622/airworthiness-directives-sikorsky-aircraft-corporation-helicopters-type-certificate-previously-held
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CC2481DE2D0EE2CB8625809F0056FF09.0001
- Page: https://openairdocs.org/proposed/FAA-2016-6968

## Summary

We propose to supersede airworthiness directive (AD) 93-17-13 for Schweizer Aircraft Corporation and Hughes Helicopters, Inc. (now Sikorsky Aircraft Corporation) (Sikorsky) Model TH55A, 269A, 269A-1, 269B, and 269C helicopters. AD 93-17-13 requires installing tachometer markings and inspecting the driveshaft. This proposed AD would require recurring inspections of the driveshaft and would expand the applicability to include Model 269C-1 helicopters. This proposed AD is prompted by reports of accidents because of driveshaft failures. The actions of this proposed AD are intended to prevent the unsafe condition on these products.

## Notices in this docket

- Jan 5, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-31622, comments due Mar 6, 2017 (https://www.federalregister.gov/documents/2017/01/05/2016-31622/airworthiness-directives-sikorsky-aircraft-corporation-helicopters-type-certificate-previously-held)

---
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.