# Proposed AD FAA-2025-0629: Airbus Helicopters Deutschland GmbH (AHD) Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2026-02-01
- Products: Airbus Helicopters Deutschland
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 25, 2025, 90 FR 17352
- Comments due: June 9, 2025
- Became: [AD 2026-02-01](https://openairdocs.org/ad/2026-02-01)
- Docket: FAA-2025-0629 (https://www.regulations.gov/docket/FAA-2025-0629, where comments are filed)
- Project: MCAI-2023-01183-R
- FR document: 2025-07111
- Official PDF: https://openairdocs.org/files/sha256/7a/5c/7a5cb773a31a856c357cbd7a155303446f2d2d78853ae061bdb87166b9e7a628 (from https://www.govinfo.gov/content/pkg/FR-2025-04-25/pdf/2025-07111.pdf)
- Federal Register: https://www.federalregister.gov/documents/2025/04/25/2025-07111/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2025-07111-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2025-0629

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Model EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC635T2+, and EC135T3 helicopters. This proposed AD was prompted by reports of ruptured and deformed flexible couplings. This proposed AD would require inspecting the axial displacement of the tail rotor driveshaft and, depending on the results, taking corrective actions including inspecting the flexible couplings. This proposed AD would also prohibit installing a tail rotor drive shaft unless certain procedures are followed. 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 25, 2025: Notice of proposed rulemaking (NPRM). (first notice), FR document 2025-07111, comments due Jun 9, 2025 (https://www.federalregister.gov/documents/2025/04/25/2025-07111/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters)

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