Making flight simulators better

Update your FSTD for upset recovery training

Loss of Control In-flight (LOC-I) accounts for over 30% of all fatalities in scheduled commercial air transport, with failed stall recovery being the single most common cause for losing control of the aircraft. Following the recommendations by ICAO, FAA and EASA have introduced and are introducing new training requirements for Upset Prevention and Recovery Training or UPRT in simulators. Limitations in the current simulator technology set the limits for effective UPRT.

Flight model extension

The AGL flight model has no limits to the flight envelope and allows flying into deep stalls and beyond. It can be added as an extension to existing FSTDs without affecting the certification or the QTGs. The following image illustrates the principle of adding an extension to an existing flight model. Just before the angle of attack exceeds the limits of the existing flight model, the simulation is gradually given over to the AGL Flight Model. Smooth blending ensures a seamless transition, invisible to the pilot and allows the simulator being flown deep into the stall.

 Data blending principle


Besides the extension, the AGL flight model can also be used as the sole flight model in new simulators and existing simulators going through extensive modernization.

Why AGL Flight Model

The AGL flight model is set apart from all other solutions by its use of new technology: The flow field around the aircraft is computed in real-time instead of the traditional way of tabulating data into look up tables.

The AGL flight model has been proven to provide extremely accurate results through validation against flight test data, wind tunnel data and subjective evaluation by SMEs. Professional pilots have been especially pleased with the stall and spin characteristics of the model, providing unrivalled fidelity throughout the upset and possible recovery. The AGL flight model fulfills and exceeds the UPRT requirements set by FAA and EASA.

The real-time computation fluid dynamics (CFD) give the AGL flight model a number of advantages for UPRT use:

  • It automatically predicts which part of the wing stalls first, depending on the angle of attack, sideslip angle, control surface angles, the angular motion of the aircraft, motion history and more. This is essential to have the correct aircraft type specific behavior during stalls, spins and recovery.
  • It has the truthful randomness associated with stalls: Each stall may be different, while still having the recognizable type specific properties. The traditional models have to rely on "playing back" a limited number of pre-recorded stalls or other highly simplified solutions, resulting in challenges achieving realism both during the early stages and especially in a fully developed stall.
  • It has no limits to the flight envelope. The regulations call for interruption of the training if the simulated envelope is exceeded. This will not happen with the AGL flight model: The student pilot may continue the flight until recovery without concern of negative training transfer because of the limitations of the simulation.
  • The AGL technology also enables the introduction of a unique feature, which allows visualization of the airflow around the wings during stalls providing a powerful aid for remembering the correct procedures through a visual memory trace. Read more here.

Contact us now to upgrade your FSTD to the latest technology and UPRT capability.

AGL Simulations Oy
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