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Garmin GSA 28 Autopilot Servo

Part# 11-11450
MFR Model# 010-01068-20


By adding 1 or more GSA 28 “smart” servo units to the G3X™ or G3X Touch™ electronic flight display systems, it’s easy to tap into some of the most advanced autopilot features ever developed (and priced) for experimental/amateur-built and light sport aircraft. Fully designed and manufactured by Garmin, the GSA 28 servo weighs only 1.4 pounds, making it more than 40 percent lighter than most autopilot servos used on experimental aircraft. Each servo is operated by its own built-in microprocessor, which provides the “smart” logic to significantly improve sensor performance, response and self-monitoring capabilities — while simplifying overall system configuration and installation.

    It All Starts with Smart Engineering
    Designed by our dedicated “Team X” engineering group for Garmin experimental avionics, the GSA 28 servos give G3X and G3X Touch system owners the ability to add autopilot capabilities similar to those provided by our top-end AFCS systems found on thousands of certified aircraft. These capabilities include: flight director cues, coupled approaches, automatic level mode, stability protection, coupled VNAV, automatic trim, IAS hold and more. You have the option of purchasing a 1-, 2- or 3-axis configuration (roll servo only, pitch+roll or pitch+roll+yaw) to achieve the level of auto-control you want. Even better, the Garmin servo provides a built-in interface to drive a customer-supplied trim servo at no extra cost. For added support, there’s even an advanced LVL mode¹ (available with an optional control panel module or through a configurable switch input) that can command the autopilot to help restore the aircraft to straight-and-level flight in case of pilot disorientation.
    The Servo with a Backup Plan
    The GSA 28 smart servo features a gear train with engagement clutch and the ability to back drive the brushless DC motor, providing multiple levels of protection against servo overspeed or failure — without the need to use a shear pin to disable the servo. The engagement clutch also decouples the motor from the flight controls, which minimizes the friction a pilot will feel when hand-flying the aircraft with the autopilot off.
    Trim Control Takes the Pressure Off
    When the autopilot is off, the GSA 28 servo provides speed scheduling for manual trim commands. Likewise, when the autopilot is on, the servo adjusts to constantly keep the aircraft trimmed. When servo input is needed to keep pressure on the controls due to an out-of-trim condition, the system will direct the servo to drive the trim until the control pressure is relieved.
    ESP-X Comes Standard
    With installation of the GSA 28 smart servos, your G3X or G3X Touch autopilot system also provides Garmin Electronic Stability and Protection (ESP-X) capability to help maintain the aircraft in stable flight. ESP-X monitors your attitude and airspeed while you’re hand-flying your aircraft, and should you inadvertently exceed user-selected pitch and bank angle limitations — or if you approach overspeed or stall speed limits — it automatically provides a correcting nudge to your flight controls to help you stay in control and get back to straight and level quickly. If you ignore the prompts, the correcting force will grow stronger as exceedances increase. Should you become incapacitated, after 15 seconds of ESP-X being engaged², the system will automatically activate your autopilot in Level Mode to bring the aircraft back to level flight. While ESP-X won’t fully recover an aircraft in all exceedance situations, the system does provide an important extra level of corrective protection for pilots of light sport and experimental/amateur-built aircraft.
    Smart Servos, Simple Installation
    Installation of GSA 28 smart servos in your aircraft is simple and straightforward — with industry-standard servo mounting kits available from Garmin. In addition, airframe-specific kit versions are offered for the popular Van’s RV series (including the RV-4, 6,7,8,9 and 10 models). Installation kits are sold separately.

¹ESP-X may not fully recover an aircraft in all exceedance situations
²ESP-X Automatic Level Mode must be in “On” configuration to activate autopilot
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Magaero L Verified Purchase


April 27, 2023

The GSA-28 is a good servo, I hope. But I was not lucky - she did not work a single day and broke down. The PFD started showing the message Servo Hardware Fault a year after installation, although I did not turn on the autopilot even once. And one more thing: GSA-28s have insufficient power, for example, the Pitch-servo cannot raise the elevator of stabilizer on my Cessna-182 when its on th ground. I have ordered one new and got it during 10 days - its very good!

Andrey P Verified Purchase


September 14, 2021

They are working very well. Our Avionics guy was very impressed with the units. Thanks,

April 27, 2020

Reviewing every item on an order is a little much. Please do not do this to me again. You have good service when ordering parts but when a problem occurs and the personnal touch is needed you fall a little short.

Gerald C
September 26, 2019


Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is this available for cable operated controls as well?

The bridle cable is not included by Garmin and you will need to buy a capstan kit add-on to make this work.

Q: What is the garmin part number on the GSA 28 servo?


Q: Is this servo a PWM or digital servo?

This servo has a highspeed PWM signal.

Q: Does this servo come with universal installation kit?

This is the servo only. The connector kit and installation kit are sold separately.

Q: Does this Garmin GSA 28 servo come with form 8130?

No, this part # 11-11450 is not intended for use in certified aircraft.

Q: I bought the GMC 507 and two servos (GSA28) but now I would like to add yaw damper, do I just order another servo? Or do I need other parts? Thank you

A third servo will be what you need.

Q: What are the dimensions of the arm on the Garmin GSA 28 servo?

2.25" long, .11" thick and .99" wide tapering down to .50". .88" from the nut to the first hole, 1.21 to the second, and 1.50 to the third.

Q: Do you sell the long arm for the gsa28 servo? Part number 115-01738-01.

The long arm is included in the RV6 Roll install kit part number 11-11440. To order the arm on its own, it will require a special order. Please contact our sales department for price and lead time.

Q: you say airframe-specific kit versions are offered for the popular Van’s RV series (including the RV-4, 6,7,8,9 and 10 models), What is the part number of the kits (pitch and roll) for an RV-6a?

The RV6 and the RV6A will be using the same kits.

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