Circuit Avionics - Flight Simulator Hardware
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Getting Started

Welcome to Circuit Avionics

Setup is quick and easy:

1. Install

2. Connect

3. Aircraft Profile

Software and Firmware Updates

Updates may be offered on installation, and on other occasions.

You don't have to update; your device will work fine. Over time, you might miss useful new features.

Firmware updates: plug directly into PC, no USB hub or extensions.

Setup Video

This video has been temporarily removed while we update it for MobiFlight 11.

You may still view it here.

In the meantime, the written checklists will get you up and running.

1. Install

MobiFlight Installation

This customised installer automatically applies the required and recommended settings for Circuit Avionics pilots.

Existing MobiFlight users may either run this installer, or adjust their settings manually.

  • Run the installer

Once installation is complete:

  • Run MobiFlight
    • The program appears on your Start Menu and Desktop as MobiFlight Connector
  • MSFS pilots: When prompted, install MobiFlight WASM Module

FSUIPC installation

FSUIPC is required for the following:

  • MSFS (PMDG 737 only)

  • FSX / P3D (all aircraft)

To install:

  • Visit FSUIPC.com to download and install the relevant version for your simulator.

  • At the registration page, click "skip"

2. Connect

  • Plug in your new hardware
    • Use the ports built into your PC, or a USB hub with a separate power supply

    • Unpowered USB hubs do not provide a sufficiently stable voltage

3. Aircraft Profile

An Aircraft Profile is a small file which contains the instructions for each button, knob and display on your hardware.

Each simulator has a "Default" profile which works well with the stock aircraft and  avionics, including many addons.

Aircraft Profiles are also available for specific aircraft, offering enhanced functionality.

Start Flight Simulator

  • Start Flight Simulator and load into your chosen aircraft

Meanwhile...

Download the Aircraft Profile

  • Download the relevant Aircraft Profile from the Aircraft Profiles page

    • If you have more than one MobiFlight device, e.g. Autopilot and Radio Stack, just choose one of them for now.
      We will add the second device later.

Open the Aircraft Profile

  • There are two ways to open the file
  • Choose one of the following:

This functionality was introduced in MobiFlight 11.2 in July 2026.

  • Close MobiFlight
  • Double-click the file you downloaded
    • MobiFlight opens and loads the aircraft profile automatically

This is the traditional way of opening Aircraft Profiles in MobiFlight.

  • In MobiFlight, open the downloaded Aircraft Profile using the File -> Open menu:

Expand the Profile

  • Expand the profile by clicking the > button

Now you can see all the functions of the Aircraft Profile:

Our Aircraft Profiles are designed to get you up and running straight away without any extra work.

If you do wish to customise how your hardware works with a particular aircraft, feel free to modify any of the configurations.

Our support page You Have Control will help get you started.

Checklist Complete!

Run the Aircraft Profile

  • Click the Run button

At this point your displays will light up and the device is functional.

If you purchased the Circuit Avionics Radio Stack, push system selector 1 at the top of the device to activate the displays.

Friendly and Available Support

Blank displays? Something doesn't look right?

Don't panic. We understand that for many of our pilots, it's your first time using MobiFlight, and for many more, your first time using this kind of hardware. We offer a friendly support service which can get you on your feet.

As a first step, please scroll up and re-check that you've gone through the checklists correctly.

A small percentage of pilots have reported that they had to restart their computer the first time they used the hardware.

Next, verify that MobiFlight can talk to both your Hardware and Flight Simulator:

Verify connection to your hardware

  • Look at the bottom of the Mobiflight window
  • Beside Connected devices, click the small arrow
  • Verify that your hardware is visible in the Modules sub-menu

    • Your hardware appears as CXL Autopilot or CXL Radio

  • If you don't see your device, reconnect the USB.
    • Plug it into the back of your PC, instead of front / top connectors
    • If you're using a USB hub, it must have a separate power input. Unpowered hubs don't provide a stable voltage

Verify connection to Flight Simulator

  • Look at the bottom of the Mobiflight window
  • Beside Sim Status, click the small arrow
  • You should see the name of your flight simulator with a green tick
  • MSFS users need the WASM to be showing green
    • If the WASM isn't showing green, use the menu option Extras -> Microsoft Flight Simulator -> Install WASM Module
      In this case, a simulator and MobiFlight restart will be required
  • FSUIPC is required for FSX / P3D
  • FSUIPC is also required for PMDG 737 on MSFS
  • ProSim can be ignored

There is a lot of documentation available, including Troubleshooting guides and Useful Information.

You may also contact us and we will be happy to help!

Have more than one MobiFlight Device? 

If you have more than one MobiFlight device, e.g. Autopilot and Radio Stack, it's easy to run them both simultaneously through MobiFlight.

See Managing Multiple Devices for more information.

Ongoing Support and Community

There is a lot of documentation available, including Useful Information.

Support is a long-term project. MobiFlight is regularly updated, as is flight simulator, and there are always new aircraft to fly.

All pilots are encouraged to join the Circuit Avionics Discord and the MobiFlight Discord.