Airworthiness Directives; Airbus Helicopters

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register Aug. 13, 2026. Document 2026-16505. Updated Nov. 7, 2026.

What it does

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.

The Federal Aviation Administration's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 482 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

943 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

Since then:

What happens next and when

This AD is effective September 17, 2026. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of September 17, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-16505
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	Aug. 13, 2026
Effective date	Sept. 17, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2025-3420

Source: the Federal Register (public domain). The document in the Federal Register