Airworthiness Directives; Hélicoptères Guimbal Helicopters

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register June 9, 2026. Document 2026-11506. Updated Nov. 10, 2026.

What it does

The FAA is adopting a new airworthiness directive (AD) for all H[eacute]licopt[egrave]res Guimbal (HG) Model Cabri G2 helicopters. The FAA previously sent this AD as an emergency AD to all known U.S. owners and operators of these helicopters. This AD was prompted by a report that was received of a crack on the main rotor (MR) mast after the crew reported an abnormal increase of vibration. This AD requires inspecting the MR mast for cracks and corrosion pitting, and depending on the results of the inspection, accomplishing corrective actions. This AD also requires modifying the MR mast, which includes applying corrosion protection to the MR mast, reporting the inspection results and prohibiting the installation of a certain main gear box (MGB), unless certain requirements are met. 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

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

Since then:

What happens next and when

This AD is effective June 24, 2026. Emergency AD 2026-10-51, issued on May 15, 2026, which contained the requirements of this amendment, was effective with actual notice.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-11506
Action	Final rule; request for comments.
Agencies	Transportation Department; Federal Aviation Administration
Published	June 9, 2026
Effective date	June 24, 2026
Comments close	July 24, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-4650

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