# Proposed AD FAA-2026-4638: Airbus Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-16-01
- Products: Airbus Helicopters
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 15, 2026, 91 FR 27873
- Comments due: June 29, 2026
- Became: [AD 2026-16-01](https://openairdocs.org/ad/2026-16-01)
- Docket: FAA-2026-4638 (https://www.regulations.gov/docket/FAA-2026-4638, where comments are filed)
- Project: MCAI-2023-00794-R
- FR document: 2026-09773
- Official PDF: https://openairdocs.org/files/sha256/a4/04/a40463a992cdf9a66db43c6b0ed7bf632b287ba7d266a0d496e4ad87e0645d6c (from https://www.govinfo.gov/content/pkg/FR-2026-05-15/pdf/2026-09773.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/05/15/2026-09773/airworthiness-directives-airbus-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-09773-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-4638

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, EC130B4, and EC130T2 helicopters. This proposed AD was prompted by reports of an incorrectly installed engine flange on the main gear box (MGB) engine coupling. This proposed AD would require inspecting the MGB engine coupling for correct installation and, depending on the results, corrective actions. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- May 15, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-09773, comments due Jun 29, 2026 (https://www.federalregister.gov/documents/2026/05/15/2026-09773/airworthiness-directives-airbus-helicopters)

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