Page 163 - PPL-engelsk 2025

Human Performance

The inertia of the fluid means that the plane can tilt, causing roll to be perceived

incorrectly.

Your head position can make tilting feel like rolling. After a short time, the fluid

adjusts, and disorientation ceases.

Semicircular canals and earstones
The sensors that are part of the
The sight
sense of balance are:
Sense of body position

The sense of balance with the arches helps us a lot when we have both “feet

on the ground” and use it together with the sense of sight.

During flight, where we are not in our normal human surroundings, impressions

from the sense of balance can bring us into unfamiliar flight positions, and we
risk losing control of the aircraft due to incorrect information.

The problem with our sense of balance is that when we make a turn during

flight, for example, we create our own gravity. The perfect turn is an illusion

that deceives our sensory apparatus, since we cannot feel it.

We have sensory cells all over our body. For example, we have sensory cells in

muscles and tendons that register the relative position of body parts. The skin's

sense of pressure also helps register the position of the body.

For a semicircular canal to signal movement, it must change by at least 3

degrees per second. When you have been in this movement for approx. 20

seconds, the signals from this arch cease. This is because there is no longer any

difference between the movement of the canal and the fluid in the movement

of the canal.

Therefore, we perform rate 1 turns during training flights to avoid spatial

disorientation. We rely on instruments and must learn to trust these and not to

trust the false sensations we can get from the vestibular system, which is the

sense of balance, with a nice word called.

Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 163