Chapter 9 - Perceptual Errors Flashcards
What is a Somatogravic illusion?
The illusion of pitching up or down due to an accelaration or decelaration.
What is a Somatogyral illusion?
Where the semicircular canals can’t accurately register a prolonged or gentle turn and when the pilot goes back to level flight they feel like they are turning the opposite direction.
What type of illusion is “the leans”
A somatogyral illusion
What is a graveyard spin?
A type of somatogyral illustion where the pilot is recoving from a spin but once in steady flight they feel like they are spinning in the opposite direction and so they try to “counter” it and end up reenterring the orginal spin.
What is the Coriolos illusion?
When in a sustained turn, if the head is moved in the posterial plane (nodded) then a severe tumbling sensation may be experienced.
When there is a conflict between vestibular and visual sensory information, what will provide the most accurate representation of he real world?
Visual sensory information.
What can cause spatial disorientation?
False perception of aircraft orientation with respect to spacial references.
If the brain recieves conficting information and pilot does not trust instruments.
How can you prevent/overcome spatial disorientation in VMC/IMC?
VMC:
Look at horizon
IMC:
Establish and maintain an instrument cross check or a scan that requires minimum head movement.
ALWAYS TRUST INSTRUMENTS
What is Vertigo and what can it be caused by?
A sensation of rotating, tumbling or turning.
Causes:
Blocked eustachian tube; Sudden pressure change in inner ear (sneezing or forcefully blowing nose); High G loading; Drug induced; Alcohol intoxication provokes it.
What flight maneovre and head movement is most likely to induce vertigo?
Banking whilst turning head laterally.
What should you do if you experience vertigo?
Establish and maintain effective instrument cross-check
Believe instruments
Ignore illusion
Minimise head movements
In VMC look at horizon.
What is a propriorecptor illusion otherwise known as?
Seat of the pants - Feeling of being correctly upright due to some radial acceleration
What is the Stroboscopic effect and what can it lead to?
Flickering from man made sources or sun through a propeller.
Can lead to nausea, giddiness and an epileptic type of fit in extreme cases.
What are some prevention techniques for the stoboscopic effect?
When in clouds, switch off strobe.
Turn out of direction of sun if possible
Most affected person into shaded seat if possible
Cover eyes or window of affected person
sunglasses may reduce effect.
