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Proposed rule

Airworthiness Directives; MD Helicopters, LLC Helicopters

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register July 1, 2026. Document 2026-13365. Updated Nov. 9, 2026.

What it does

The FAA proposes to adopt a new airworthiness directive (AD) for certain MD Helicopters, LLC (MDHI) Model 369D, 369E, 369F, 369FF, 369H, and 500N helicopters. This proposed AD was prompted by a report of mechanical damage to the main transmission drive shaft coupling (coupling). This proposed AD would require a one-time visual inspection of the couplings for cracks of the splines and, depending on the results, replacement of the couplings. The FAA is proposing this AD to address the unsafe condition on these products.

The Federal Aviation Administration's summary, as published in the Federal Register.

What it would change

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Before this

878 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

Since then:

What happens next and when

The FAA must receive comments on this proposed AD by August 17, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number2026-13365
ActionNotice of proposed rulemaking (NPRM).
AgenciesTransportation Department; Federal Aviation Administration
PublishedJuly 1, 2026
Comments closeAug. 17, 2026
Regulation identifier (RIN)2120-AA64
DocketFAA-2026-4666

Source: the Federal Register (public domain). The document in the Federal Register