Lernkarten
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84 Multiple Choice Antworten
The time required for complete adaptation is
for day and night: 30 min
for high levels of illumination 10 minutes and for low levels of illumination 30 minutes
for high levels of illumination 10 sec and for full dark adaptation 30 min
for night 10 sec and for day 30 min
The requirement of good sunglasses is to
eliminate distortion in aircraft windshields
fit to the pilots individual taste
absorb enough visible light to eliminate glare without decreasing visual acuity, absorb UV and IR radiation and absorb all colors equally
increase the time for dark adaptation
Why does a deficiency in vitamin A cause night-blindness?
Vitamin A deficiency interrupts the oxygen supply to the photosensitive cells
Accomodation is destroyed
Vitamin A is essential to the regeneration of visual purple
The transfer of light stimulus from the rods to a nerve impulse depends on vitamin A
Scanning at night should be performed by:
avoiding food containing Vitamin A
scanning with one eye open
concentrated fixation on an object (image must fall on the fovea centralis)
slight eye movements to the side of the object
Approaches at night without visual references on the ground and no landing aids (e.g. VASIS) can make the pilot believe of beeing
higher than actual altitude with the risk of overshooting
higher than actual altitude with the risk of landing short ("ducking under")
lower than actual altitude with the risk of overshooting
lower than actual altitude with the risk of ducking under
A pilot is used to land on wide runways only. When approaching a smaller and/or narrower runway, the pilot may feel he is at a
greater height and the impression of landing short
lower than actual height with the tendency to overshoot
greater height than he actually is with the tendency to land short
lower height and the impression of landing slow
Flickering light when reflected from spinning rotor blades
can cause spatial disorientation and/or nausea, when looked at for a longer period of time
can be neglected
can be avoided when the strobe-lights are switched on
should be avoided, because it may destroy the optical nerve
A pilot approaching a runway which is narrower than normal may feel he is at a greater height than he actually is. To compensate he may fly a
higher than normal approach with the tendency to overshoot
compensatory glide path and land long
compensatory glide path and stall out
flatter than normal approach with the tendency to undershoot
