# Proposed AD FAA-2025-3420: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-16-03
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 30, 2025, 90 FR 46773
- Comments due: November 14, 2025
- Became: [AD 2026-16-03](https://openairdocs.org/ad/2026-16-03)
- Docket: FAA-2025-3420 (https://www.regulations.gov/docket/FAA-2025-3420, where comments are filed)
- Project: MCAI-2025-00225-R
- FR document: 2025-19083
- Official PDF: https://openairdocs.org/files/sha256/cc/55/cc5555c1a5b1eae1148a1a8f527cf1bdade9b5095261fc7730928626005d2f40 (from https://www.govinfo.gov/content/pkg/FR-2025-09-30/pdf/2025-19083.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/09/30/2025-19083/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-19083-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-3420

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Model AS355E, AS 355-F, AS 355-F1, AS355F2, and AS355N helicopters. This proposed AD was prompted by reports of cracks in the legs of the side supports of the tail rotor transmission fan. This proposed AD would require repetitively inspecting the side supports of the tail rotor transmission fan for cracks and, depending on the results, replacing both side supports. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Sep 30, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-19083, comments due Nov 14, 2025 (https://www.federalregister.gov/documents/2025/09/30/2025-19083/airworthiness-directives-airbus-helicopters)

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