# Proposed AD FAA-2018-0991: MD Helicopters Inc. (MDHI) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-05-04
- Products: MD Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 26, 2018, 83 FR 60376
- Comments due: January 25, 2019
- Became: [AD 2019-05-04](https://openairdocs.org/ad/2019-05-04)
- Docket: FAA-2018-0991 (https://www.regulations.gov/docket/FAA-2018-0991, where comments are filed)
- FR document: 2018-25497
- Official PDF: https://openairdocs.org/files/sha256/1e/d2/1ed280b19dd2eadb5bfdc4a9aef4c197ec0861be0c1982d32d50fed7fe37dcd7 (from https://www.govinfo.gov/content/pkg/FR-2018-11-26/pdf/2018-25497.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/11/26/2018-25497/airworthiness-directives-md-helicopters-inc-mdhi-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/911420C5FBE5FD2586258351006A1CEE.0001
- Page: https://openairdocs.org/proposed/FAA-2018-0991

## Summary

We propose to adopt a new airworthiness directive (AD) for MDHI Model 369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. This proposed AD would require inspecting each main rotor blade (MRB) for a crack. This proposed AD is prompted by reports of cracked MRBs. The actions of this proposed AD are intended to address an unsafe condition on these helicopters.

## Notices in this docket

- Nov 26, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-25497, comments due Jan 25, 2019 (https://www.federalregister.gov/documents/2018/11/26/2018-25497/airworthiness-directives-md-helicopters-inc-mdhi-helicopters)

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