Here is information from Thomas Funke who was involved in a project which used subLOGIC's Flight Simulator II for C 64 in a professional flight training device in East Germany between 1988 and 1990. He was the guy who re-engineered and tweaked the software.

The modified version of subLOGIC Flight Simulator II for Commodore 64

    This is a modified version of subLOGIC's Flight Simulator II for Commodore 64. It has metric instruments (an air speed indicator in km/h, an altimeter in meters, a vertical speed indicator in m/s)  a simple head-up display with tape-style radio altimeter in meters as well, digital readout of height AGL (AGL = above ground level) and digital readout of altitude AMSL (AMSL = above mean sea level) in meters. There are call sign placard Y4SMA (aircraft registration DDR-SMA) and an indicator light for HUD.

    The simulator was linked to the cockpit section of a retired Zlin Z-37 aircraft i.e. the control stick, rudder pedals, power lever, flaps lever and various cockpit switches were hooked up to the computer and a large computer monitor mounted in front of the cockpit window.

    To drastically improve realism, the simulation rate (and display frame rate) was increased fourfold by porting the Commodore 64 version with a lot of effort to a more powerful computer platform: Roßmöller's Turbo Process based on a 65C02 processor with 4 MHz clock rate.

    Several simulator features were added (analog flight and engine control input) or improved (reposition accuracy, ILS localizer alignment). In addition, a very annoying software bug could be fixed (engine failure after using the editor).

    This setup was used at the Interflug Flight Academy at Leipzig-Mockau airport from 1988 to 1990. It served mainly as a part-task trainer to complement classroom IFR navigation training with hands-on flight exercises.