# Proposed AD FAA-2017-1125: MD Helicopters Inc. Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-06-11
- Products: MD Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 10, 2018, 83 FR 45580
- Comments due: November 9, 2018
- Became: [AD 2020-06-11](https://openairdocs.org/ad/2020-06-11)
- Docket: FAA-2017-1125 (https://www.regulations.gov/docket/FAA-2017-1125, where comments are filed)
- FR document: 2018-19435
- Official PDF: https://openairdocs.org/files/sha256/a6/95/a6951921e10717a1e697cc46504dde675b63446d10d72cbefac56f1469e3c04d (from https://www.govinfo.gov/content/pkg/FR-2018-09-10/pdf/2018-19435.pdf)
- Federal Register: https://www.federalregister.gov/documents/2018/09/10/2018-19435/airworthiness-directives-md-helicopters-inc-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BABABAF71D0F1290862583040061961F.0001
- Page: https://openairdocs.org/proposed/FAA-2017-1125

## Summary

We propose to adopt a new airworthiness directive (AD) for MD Helicopters Inc. (MDHI) Model 600N helicopters. This proposed AD would require establishing a life limit for the main rotor (M/R) blade upper control collective/longitudinal link assembly (link assembly). This proposed AD is prompted by the discovery that the life limit was omitted from the maintenance manual. The actions of this proposed AD are intended to prevent an unsafe condition on these products.

## Notices in this docket

- Sep 10, 2018: Notice of proposed rulemaking (NPRM). (first notice), FR document 2018-19435, comments due Nov 9, 2018 (https://www.federalregister.gov/documents/2018/09/10/2018-19435/airworthiness-directives-md-helicopters-inc-helicopters)

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