Garmin Adds GFC™ 600 Approvals
Now Available for the Cessna 421B
Garmin continues to raise the bar for general aviation safety and performance. We’re excited to announce that the FAA has granted STC (Supplemental Type Certificate) approval for the installation of the GFC™ 600 autopilot in Cessna 421B aircraft, serial numbers 421B0301 through 421B0970. This latest approval also includes compatibility with Smart Rudder Bias, an advanced safety feature designed to assist pilots during engine-out scenarios in twin-engine aircraft.
What This Means for Cessna 421B Owners
This approval opens the door for owners of the popular Cessna 421B Golden Eagle to upgrade their legacy autopilot systems with Garmin’s state-of-the-art digital autopilot. The GFC 600 offers enhanced flight control, superior performance, and improved situational awareness.
Even more exciting: with the addition of the Garmin G600 TXi flight display and TXi EIS (Engine Indication System), 421B owners can now benefit from Smart Rudder Bias, a Garmin-exclusive technology designed to help maintain control in engine failure conditions.
Why Upgrade to the Garmin GFC 600 Autopilot?
The GFC 600 is engineered for high-performance piston twins and turboprops, offering a major leap forward in autopilot technology:
Precision and Stability
The GFC 600 delivers smooth, precise flight control and integrates seamlessly with Garmin’s G600/G700 TXi, GTN™ Xi series navigators, and more.
Advanced Safety Features
ESP™ (Electronic Stability and Protection) – Gently nudges the aircraft back to safe flight parameters if the pilot becomes disoriented.
Smart Rudder Bias – Assists in recognizing engine-out conditions and applies appropriate rudder pressure to help maintain control.
Underspeed/Overspeed Protection – Helps avoid stalls and excessive airspeeds.
Vertical Navigation (VNAV) – Allows smooth descent planning from cruise to approach.
Modular and Scalable
Its flexible design allows installation in a wide range of aircraft with minimal disruption to existing avionics.
What You Need to Enable Smart Rudder Bias
Smart Rudder Bias is only available when the GFC 600 is paired with:
For a full list of approved configurations, refer to the latest GFC 600 STC Equipment List provided by Garmin.
Availability and Ordering
The GFC 600 autopilot system for Cessna 421B (S/N 421B0301–421B0970) is available to order now, with shipments beginning in the coming weeks. Contact our Sales Team for pricing, and to schedule your upgrade.
Final Thoughts
Garmin’s GFC 600 upgrade gives 421B operators access to the most advanced autopilot and engine-out safety technology available in general aviation today. Combined with a modern glass cockpit setup, this upgrade significantly improves both operational confidence and long-term aircraft value.