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FEDE Office of the Federal Register / National Archives and Records Administration · Rulemaking

Airworthiness Directives; MD Helicopters, LLC Helicopters

Transportation Department, Federal Aviation Administration | Proposed Rule | 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.

ML Reported by Maria Lopez
July 1, 2026 · 1 min read

Airworthiness Directives; MD Helicopters, LLC Helicopters.

The item is dated 2026-07-01.

TeamCog is carrying it as a rulemaking report from FederalRegister.gov published documents API.

Transportation Department, Federal Aviation Administration | Proposed Rule | 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 handoff preserves the official source citation and source-completeness evidence supplied by discovery.

Official Source

FederalRegister.gov published documents API. Accessed 2026-07-01T15:00:03.630Z.