# Proposed AD FAA-2017-0270: MD Helicopters, Inc. Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-17-03
- Products: MD Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 3, 2017, 82 FR 16138
- Comments due: June 2, 2017
- Became: [AD 2017-17-03](https://openairdocs.org/ad/2017-17-03)
- Docket: FAA-2017-0270 (https://www.regulations.gov/docket/FAA-2017-0270, where comments are filed)
- Project: 2016-SW-032-AD
- FR document: 2017-06460
- Official PDF: https://openairdocs.org/files/sha256/d1/1d/d11dcb61ea24901205f4a4c3cb7f35667ff0fc3b835ac0690d260128a9058d2f (from https://www.govinfo.gov/content/pkg/FR-2017-04-03/pdf/2017-06460.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/04/03/2017-06460/airworthiness-directives-md-helicopters-inc-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7E360A94393A1363862580F7004F68EE.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0270

## Summary

We propose to supersede airworthiness directive (AD) 2014-16- 01 for MD Helicopters, Inc. (MDHI) Model MD900 helicopters. AD 2014-16- 01 requires an eddy current inspection of the main rotor upper hub assembly (upper hub) for a crack. Since we issued AD 2014-16-01, three additional upper hub cracks were reported. This proposed AD would require additional inspections and replacing the fillet seal. These proposed actions are intended to prevent an unsafe condition on these products.

## Notices in this docket

- Apr 3, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-06460, comments due Jun 2, 2017 (https://www.federalregister.gov/documents/2017/04/03/2017-06460/airworthiness-directives-md-helicopters-inc-helicopters)

---
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.