Night Operations Practice Questions
for the Private Pilot Written Test
Night questions cover how your eyes adapt to darkness, the visual illusions that cause accidents, required aircraft lighting and equipment, and night passenger-currency rules. These sample questions cover the full spread.
1.Which type of photoreceptor cell is primarily responsible for night vision?
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A. Rods
Rods are responsible for vision in dim light and peripheral vision, making them essential for night flying. (PHAK Ch. 17)
2.How long does it typically take for the human eye to fully adapt to darkness?
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B. 30 minutes
It typically takes about 30 minutes for the human eye to fully adapt to darkness and reach maximum sensitivity. (PHAK Ch. 17)
3.Which color of cockpit lighting is best to preserve night vision?
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C. Red
Dim red (or low-intensity) lighting best preserves night vision because it causes the least bleaching of the light-sensitive rhodopsin in the rod cells used for night vision. (Trade-off: red light washes out red markings on charts.) (PHAK Ch. 17; AIM 8-1-6)
4.To best detect traffic at night, you should:
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C. Scan slowly using off-center vision
Off-center viewing and a slow, systematic scan are recommended for night traffic detection because rod cells, which are responsible for night vision, are located away from the fovea (the center of the retina). This technique improves the ability to see objects in low-light conditions. (PHAK Ch. 17)
5.Which illusion might a pilot experience during a night approach over featureless terrain with few lights?
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B. Black hole approach
A 'black hole' approach illusion can occur during a night approach over featureless terrain with few lights, causing pilots to perceive they are higher than they actually are and potentially fly dangerously low. (PHAK Ch. 17; AIM 8-1-5)
6.Which phenomenon causes a stationary light at night to appear to move if stared at?
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A. Autokinesis
Autokinesis is the phenomenon where a stationary light appears to move when it is stared at for an extended period in darkness. This can lead to spatial disorientation at night. (PHAK Ch. 17)
7.A runway with bright edge lights appearing wider than usual at night may cause the pilot to:
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A. Fly a higher approach
A runway with bright edge lights that appear wider than usual can create the illusion that the aircraft is lower than it actually is. To compensate, the pilot may fly a higher approach than normal. This illusion is discussed in the Pilot's Handbook of Aeronautical Knowledge (PHAK Ch. 17) and AIM 8-1-5. (PHAK Ch. 17; AIM 8-1-5)
8.How are runway edge lights typically identified at night?
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B. White lights are used for runway edges at night.
Runway edge lights are white, as specified in AIM 2-1-4. Blue lights are for taxiway edges, green for runway thresholds, and red for runway ends.
9.What color identifies the threshold lights on a runway at night?
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A. Green
Threshold lights are green when viewed from the approach end. (AIM 2-1-4)
10.Which lighting system provides visual glidepath information during night approaches?
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B. PAPI system
The PAPI (Precision Approach Path Indicator) system provides visual glidepath information during night approaches by displaying red and white lights to indicate whether the aircraft is above, on, or below the glidepath. (PHAK Ch. 14; AIM 2-1-2)
11.To activate pilot-controlled lighting at most airports, how many microphone clicks are needed for maximum intensity?
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C. 7 clicks on the microphone
To activate pilot-controlled lighting at most airports for maximum intensity, you should key the microphone seven times on the CTAF. (AIM 2-1-9)
12.According to 14 CFR §61.57, night currency for carrying passengers requires:
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B. 3 takeoffs and full stop landings at night in 90 days
14 CFR §61.57(b) requires 3 takeoffs and 3 landings to a full stop, made at night (1 hour after sunset to 1 hour before sunrise), within the preceding 90 days, to carry passengers at night. Day landings or touch-and-goes do not count.
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