# Airworthiness Directives; Hélicoptères Guimbal Helicopters
> **Rule** · Final rule. · Published 2026-09-28 · Effective 2026-11-02 · 91 FR 61118
## Document
- **Document number:** 2026-19761
- **Category:** airworthiness
- **Manufacturer:** Hélicoptères Guimbal
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 61118
- **Publication date:** 2026-09-28
- **Effective date:** 2026-11-02
- **FAA docket:** Docket No. FAA-2026-4630
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain H[eacute]licopt[egrave]res Guimbal (HG) Model Cabri G2 helicopters. This AD was prompted by a report of a potential malfunction of the helicopter emergency locator transmitter (ELT) and subsequent findings of weak ELT signals on 121.5 MHz and 406 MHz frequencies due to improper antenna installation (location). This AD requires revising the existing rotorcraft flight manual (RFM) for the helicopter. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/09/28/2026-19761/airworthiness-directives-hlicoptres-guimbal-helicopters)
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