The following Glossary is centric to Flight Simulation Training Devices (FSTDs) and although many terms and abbreviations have similar, or the same meaning in other parts of the aviation industry, the following is specific to FSTDs.  The list has been created from many sources plus the valued input of the colleagues of Training Technology International (Canada) Ltd.  Every effort has been made to make sure it is accurate, but as with all documents of this type it is quite possible that errors exist.  If you find one of those, or have a suggestion for improvement, please contact us here…

Visual system response time

‘Visual system response time’ means the interval from an abrupt control input to the completion of the visual display scan of the first video field containing the resulting different information.

Weight, Altitude, Temperature

An abbreviation combining the separate parameters of weight, altitude and temperature

Well-understood effect

‘Well-understood effect’ means an incremental change to a configuration or system that can be accurately modelled using proven predictive methods based on known characteristics of the change.

Wind velocity

The velocity of the ambient wind outside the aircraft, usually expressed in knots. This value is often separated into longitudinal, lateral and vertical components for FSTD validation data purposes.


The airplane attitude with respect to, or around, the vertical axis expressed in degrees. 

Yaw Dampers

Yaw Dampers are a device to improve Dutch-roll damping.

Yaw trim

The mechanism that adjusts the aerodynamic forces on the yaw control surfaces so that the aircraft maintains the set attitude without any further control input.

Zero Flight Time

Zero Flight Time Training (ZFTT) refers to the training given on an aircraft type rating course that is carried out entirely in a simulator, i.e. using no training time that requires flying in the actual aeroplane.