# Proposed AD FAA-2025-3987: MD Helicopters, LLC Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-19-01
- Products: MD Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 18, 2025, 90 FR 51596
- Comments due: January 2, 2026
- Became: [AD 2026-19-01](https://openairdocs.org/ad/2026-19-01)
- Docket: FAA-2025-3987 (https://www.regulations.gov/docket/FAA-2025-3987, where comments are filed)
- Project: AD-2025-00017-R
- FR document: 2025-20093
- Official PDF: https://openairdocs.org/files/sha256/20/b2/20b22050d2c0019c4cb39040fb4d18a763b84c998e92b27a27f897e514f50289 (from https://www.govinfo.gov/content/pkg/FR-2025-11-18/pdf/2025-20093.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/11/18/2025-20093/airworthiness-directives-md-helicopters-llc-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-20093-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-3987

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2024-23-06, which applies to certain MD Helicopters, LLC (MDHI) Model 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. AD 2024-23-06 requires 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, it has been determined that additional torque tube assemblies are affected by this unsafe condition. This proposed AD would continue to require the actions of AD 2024-23-06 and would expand the applicability. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Nov 18, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-20093, comments due Jan 2, 2026 (https://www.federalregister.gov/documents/2025/11/18/2025-20093/airworthiness-directives-md-helicopters-llc-helicopters)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.