routineRule

AD FAA-2025-3420

Airworthiness Directives; Airbus Helicopters

Summary

The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Model AS355E, AS355F, AS355F1, AS355F2, and AS355N helicopters. This AD was prompted by reports of cracks in the legs of the side supports of the tail rotor transmission fan. This AD requires 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 issuing this AD to address the unsafe condition on these products.

Directive Details

AD Number

FAA-2025-3420

Document Number

2026-16505

Type

Rule

Publication Date

August 13, 2026

Effective Date

September 17, 2026

Affected Manufacturer

Airbus

Criticality

routine

Emergency

Docket ID

Docket No. FAA-2025-3420

Topics

Air transportationAircraftAviation safetyIncorporation by referenceSafety

Official Documents

View PDF View on Federal Register

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