# Airworthiness Directives; MD Helicopters, LLC Helicopters
> **Rule** · Final rule. · Published 2026-09-15 · Effective 2026-10-20 · 91 FR 58365
## Document
- **Document number:** 2026-18927
- **Category:** airworthiness
- **Manufacturer:** MD
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 58365
- **Publication date:** 2026-09-15
- **Effective date:** 2026-10-20
- **FAA docket:** Docket No. FAA-2025-3987
## Abstract

The FAA is superseding Airworthiness Directive (AD) 2024-23- 06, which applied to certain MD Helicopters, LLC Model 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. AD 2024-23-06 required repetitively inspecting the torque tube assembly and roller bearings, and depending on the results, replacing parts or accomplishing additional inspections. Since the FAA issued AD 2024-23-06, the FAA has determined that additional torque tube assemblies are affected by this unsafe condition. This AD continues to require the actions of AD 2024-23-06 and expands the applicability. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/09/15/2026-18927/airworthiness-directives-md-helicopters-llc-helicopters)
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