# Proposed AD FAA-2025-0617: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2025-13-09
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 15, 2025, 90 FR 15667
- Comments due: May 30, 2025
- Became: [AD 2025-13-09](https://openairdocs.org/ad/2025-13-09)
- Docket: FAA-2025-0617 (https://www.regulations.gov/docket/FAA-2025-0617, where comments are filed)
- Project: MCAI-2024-00331-R
- FR document: 2025-06186
- Official PDF: https://openairdocs.org/files/sha256/60/6f/606fc8f9703c6ef8ee2a52e5f7a1e5f7b154b0d4f4671732e74ff1dffda97757 (from https://www.govinfo.gov/content/pkg/FR-2025-04-15/pdf/2025-06186.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/04/15/2025-06186/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-06186-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0617

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Model AS-365N2, AS 365 N3, EC 155B, EC155B1, SA-365N, and SA-365N1 helicopters. This proposed AD was prompted by reports of loss of tightening torque between the upper ball bearing end and the main rotor (MR) servo-control. This proposed AD would require inspecting the tightening torque and, depending on the results, taking corrective action. This proposed AD would also require reporting information. These actions are specified in a European Union Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 15, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-06186, comments due May 30, 2025 (https://www.federalregister.gov/documents/2025/04/15/2025-06186/airworthiness-directives-airbus-helicopters)

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