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Human Performance
2.5.5.4 Illusions of high speed
When operating close to the ground, illusions of false perceptions of speed can
occur.
For example, transitioning into a tailwind while turning close to the ground may
create the illusion of sufficient speed to perform a steep banked turn.
This has, unfortunately, led to accidents caused by stalling in turns due to
insufficient true air speed (TAS).
Always check the airspeed indicator!
Despite its frequency, this illusion has received little attention in aviation
training, even though it affects even experienced pilots.
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2.5.6 Non-verbal communication
When communicating verbally, the spoken words typically account for less
than half of what the recipient perceives.
If the recipient can see the speaker, body language and facial expressions are
interpreted alongside the spoken words.
Other cues, such as tone of voice, speed, volume, variations, and pauses, also
influence interpretation.
Non-verbal communication is widely used in noisy aviation environments. As
long as the signals are recognized, they work effectively.
For example, an instructor pointing to the airspeed indicator to alert a student
to a speed issue is a form of non-verbal communication.
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 166
