External EasyFMC

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EasyFMC as a Standalone Application

External EasyFMC is a simple and universal Flight Managament Computer. It offers exactly the same features as EasyFMC, described on the EasyFMC page and the EasyFMC documentation.
It requires no navigation database, it can be used with any aircraft and it is provided with 2 FMC look-and-feel: Airbus and Boeing.

External EasyFMC is a specific product, it is an independent executable that can run on the same computer as Flight Simulator or on a different computer on the same network (remote mode). It does not require the basic version of EasyFMC.
It is compatible with FSX, P3D and FS2004.

External EasyFMC is a separate and independent product. It requires FSUIPC to establish the communication between FSX/P3D/FS2004 and the External EasyFMC application, and optionally requires WideFS for network communication if you want to have FSX/P3D/FS2004 and External EasyFMC running on 2 different computers (remote mode).



How does it work?

External EasyFMC does not require any navigation database because it uses the database of the simulator (FSX, P3D or FS2004). This is why it works with a gauge (an invisible gauge) called "Data Collector Gauge" (DCG) that runs in the simulator itself to collect the navigation information and provide it to the External EasyFMC application through FSUIPC.

Here is a diagram showing how it works with the Beoing look-and-feel:

Beoing configuration

It works the same way with the Airbus look-and-feel:

Airbus configuration

This is very simple, it just requires to have the data collector gauge installed in the panel of the aircraft you want to fly with External EasyFMC. A "Panel Updater" application is provided in the package to automatically add this gauge for you.

Panel Updater application

March 2016 upgrade

This upgrade includes the following :

Known Issue Workaround:
In addition, I have noticed a problem that can cause a connection failure, especially with FS2004. It happens when you fly an aircraft that uses a look-and-feel, let's say the 737, and if you select another aircraft that uses the other look-and-feel right after (the Airbus), the connection may not work. This is because External EasyFMC uses 2 variations of the same data collector gauge, 1 for Boeing and 1 for Airbus. When you switch from Airbus to Boeing look-and-feel, or vice versa, the gauge may not be properly unloaded and reloaded.
Don't worry if you don't understand my explanations, the most important is to understand the workaround:
In such situation, load a "neutral" aircraft that does not use External EasyFMC at all before switching to an aircraft that uses another look-and-feel. Doing this, the gauge will be properly reloaded and initialized, and the connection will work fine.


The External EasyFMC package includes:

FSX Package Prepar3D PackageFS2004 Package
Download FSX Installer Download P3D installerDownload FS2004 Installer


The price of External EasyFMC for any simulator (FSX, P3Dv3 or FS2004) is 19.90 Euros. Click on the button below to pay securely using PayPal. When the payment is finalized, you will receive your registration key within 24 hours.

Buy External EasyFMC for P3D/FSX/FS2004


The full product documentation is available here. It describes all the EasyFMC features in details. Don't hesitate to read it for comprehensive information about the product.
It is also available in PDF format here.

Existing customers may be only interested in the changes that appeared in the March 2016 updated documentation:

Keyboard Mode

The keyboard is always active with External EasyFMC. As soon as the window is active, any key typed on the keyboard will appear in the scratchpad. This makes data entry much easier.
The Backspace key can be used to erase characters (equivalent to the CLR button). Please note the / - + . keys are available on the numeric keypad only.
Functions keys are used for the LSK and RSK buttons:

  • F1 to F6: LSK1 to LSK6
  • F7 to F12: RSK1 to RSK6
WARNING: The F10 key toggles the menu bar, this is a standard Windows behavior. It means you may have to press F10 twice to acivate RSK4.

Some minor differences exist between Airbus and Boeing keys:

Airbus Boeing
Up Arrow key: Scroll Up
Down Arrow key: Scroll down
Page UP key: Previous Page
Page Down key: Next Page
Del key: DEL

Viewing Features

The Airbus and Boeing External EasyFMC applications have some viewing features that can help, especially in the context of using them in a home-made cockpit. They are all present in the "View" menu and the "Help" menu shows the keyboard shortcuts associated to these features.

  • Hide Menu Bar (Alt-M key)
    Show/hide the menu bar. The pulldown menus are obviously not accessible when the menu bar is hidden, so press M again to show it if you need to get access to the menu.
  • Hide Frame (Alt-F key)
    Show/hide the window frame. This is especially useful if you use External EasyFMC on a separate screen integrated in a cockpit. The window cannot be move or resized if the frame is not visible, so press F again to show it if you need to move/resize the window.
  • Show Clickspots (Alt-S key)
    Show/hide the clickable zones.
  • Reset Ratio (Alt-W and Alt-H keys)
    As the window can be resized in any way, you may lose the aspect ratio (the keys may not be square anymore). In this case, you can reset the correct aspect ratio by changing the window width (Alt-W key) or the window height (Alt-H key).
  • Initial Size (Alt-I key)
    This resets the window size to its initial size, which is the original size of the background image that represents the FMC.
  • Always on top (Alt-A key)
    Activate/deactivate the topmmost priority for the External EasyFMC window.