Garmin adds IFR and 4-axis capability to GFC 600H helicopter flight control system

Modern flight control system supports IFR flying with Stability Augmentation System

OLATHE, Kan./February 20, 2024/PR Newswire – Garmin (NYSE: GRMN) today announced the GFC™ 600H Helicopter Flight Control System is now available in an IFR configuration with a Stability Augmentation System (SAS). This configuration includes collective control, bringing 4-axis capability to the GFC 600H system for the first time. Leonardo Helicopters’ AW109 Trekker is the first platform to incorporate the GFC 600H with IFR and collective axis capabilities, providing operators with an advanced flight control solution that reduces pilot workload and improves mission effectiveness.

We are very excited to now offer a 4-axis, IFR flight control system for the helicopter market. This technology will provide IFR operators with advanced automated flight capabilities and bring added protections to one of the most challenging flight categories in aviation. We’re confident AW109 Trekker operators will be impressed with the performance of GFC 600H.”  –Carl Wolf, Garmin Vice President of Aviation Sales and Marketing

The GFC 600H features a console-mounted mode controller with push-button controls and a night vision goggle (NVG) compatible display. Digitally controlled, high-performance servos and new Garmin developed linear actuators allow for faster, crisper, more powerful responses – enabling the GFC 600H to perform with smooth handling throughout the flight envelope. Autopilot modes supported include altitude acquire, altitude hold, approach auto-level, radar height hold, as well as vertical speed, indicated airspeed, heading select, attitude hold, and more. Using navigation system inputs, GFC 600H can also fly various approach types.

IFR capable with Stability Augmentation

The IFR configuration of the GFC 600H consists of a GMC 605H mode controller, GFS 83 smart servos in each of the four axes, and three GLA 85 smart linear actuators (pitch/roll/yaw) resulting in a reliable digital system that is lightweight, yet rich in features. Unlike traditional IFR helicopter flight control systems, the GFC 600H uniquely leverages its smart servos to eliminate the need for dual linear actuators in each axis along with flight control computers – resulting in a digital system that is lightweight and cost-effective while still the providing redundancy required for IFR flight.

The GFC 600H SAS functionality improves the helicopter’s basic flying characteristics throughout the flight envelope, as well as enhancing pilot handling and precision. Using the smart linear actuators, the GFC 600H provides rate damping without moving the cyclic, providing a highly capable SAS solution for operators. 

Collective control

In addition to pitch, roll and yaw axis control, the GFC 600H can now control the collective. Power management enables additional functions that can enhance safety and reduce pilot workload. For example, GFC 600H can allow a pilot to cruise, transition to hover, and hover, all completely hands-off. New safety features available with 4th axis include low height protection and power limiting. Low height protection can help prevent controlled descent into terrain by automatically raising the collective to reduce descending vertical speed. Power limiting can keep engine parameters below maximum limits by lowering the collective, in order to prevent engine exceedances.

Proven, robust capabilities

The new capabilities in the IFR configuration of GFC 600H expand a portfolio of previously certified features in the VFR configuration of GFC 600H available for AS350 and Bell 505 helicopters1. Safety tools such as Garmin’s Helicopter Electronic Stability and Protection (H-ESP) to help the pilot remain within a safe flight envelope when hand-flying the helicopter. A dedicated LVL button can be engaged by the pilot to return to straight-and-level flight, helping to avoid potential disorientation in degraded visual environments (DVE) or inadvertent entry into instrument meteorological conditions (IMC).

The IFR configuration of the GFC 600H flight control system has received European Union Aviation Safety Agency (EASA) approval on the AW109 Trekker helicopter. FAA approval is expected later. To learn more, visit

Garmin products and services have revolutionized flight and become essential to the lives of pilots and aircraft owners and operators around the world. A leading provider of solutions to general aviation, business aviation, rotorcraft, advanced air mobility, government and defense, and commercial air carrier customers, Garmin believes every day is an opportunity to innovate. Recipient of the prestigious Robert J. Collier Trophy for Garmin Autoland, Garmin developed the world’s first certified autonomous system that activates during an emergency to control and land an aircraft without human intervention. Visit the Garmin Newsroomemail our media team, connect with @garminaviation on social, or follow our blog.

1 Features may vary by specific aircraft configuration.

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Garmin International, Inc. is a subsidiary of Garmin Ltd. (NYSE: GRMN). Garmin Ltd. is incorporated in Switzerland, and its principal subsidiaries are located in the United States, Taiwan and the United Kingdom. Garmin is a registered trademark and GFC and H-ESP are trademarks of Garmin Ltd. or its subsidiaries.

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Mikayla Minnick
Garmin International, Inc.
Phone | 913-397-8200
E-Mail | [email protected]

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