AFH 11 EXAM QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
What is the definition of 'night' according to 14 CFR part 1? - ANS The time between the end
of evening civil twilight and the beginning of morning civil twilight, as published in the Air
Almanac.
What is the significance of evening civil twilight? - ANS It begins when the geometric center
of the sun is 6 degrees below the horizon at sunset.
What are the requirements for a pilot to operate at night according to 14 CFR part 61? -
ANS The pilot must have made 3 takeoffs and landings to a full stop within the preceding 90
days during the specified night hours.
What is the time frame defined as 'night' for recent flight experience requirements? - ANS 1
hour after sunset to 1 hour before sunrise.
What is the primary physiological limitation affecting pilots during night operations? -
ANS Diminished vision in low-light conditions.
What part of the eye controls the amount of light entering? - ANS The pupil, which is
controlled by the iris.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,What is the function of the retina? - ANS To contain photosensitive cells (rods and cones) that
record images.
Where are cones primarily located in the eye? - ANS In the central area of the retina known
as the macula.
What is the role of rods in vision? - ANS They are used for low light intensity or night vision
and detect position references in shades of gray.
What is photopic vision? - ANS Vision during daytime or high-intensity artificial illumination
relying on central vision.
What is mesopic vision? - ANS Vision that occurs at dawn, dusk, or under full moonlight,
requiring both central and peripheral vision.
What is scotopic vision? - ANS Vision during nighttime or low light conditions where central
vision is ineffective.
What is the 'night blind spot'? - ANS An area in the central 5 to 10 degrees of the visual field
where objects may go undetected in low light.
How long does maximum dark adaptation take? - ANS Up to 30 minutes.
What effect do aircraft anti-collision lights have on night vision adaptation? - ANS They do not
impair night vision adaptation due to their short duration of exposure.
What is the function of the lens in the eye? - ANS To focus light on the surface of the retina.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What happens to the image of an object if looked at directly at night? - ANS The image may
fade away completely after a few seconds.
What is the role of the optic nerve in vision? - ANS To carry electrical signals from the rods
and cones to the brain for interpretation.
What is the primary function of the cones in the retina? - ANS To detect detail, perceive color,
and identify far-away objects in bright light.
What is the difference between rods and cones in terms of sensitivity? - ANS Rods are about
10,000 times more sensitive to light than cones.
What should pilots consider when flying at night? - ANS Physical limitations, equipment
requirements, procedures, and emergency situations.
What is the relationship between the fovea and night vision? - ANS The fovea lacks rods,
making it ineffective for night vision.
What is the effect of low ambient illumination on vision? - ANS It can cause the night blind
spot, making it difficult to detect objects directly viewed.
What is the importance of understanding eye function for pilots? - ANS It can lead to
behaviors that improve night vision significantly.
What is the role of peripheral vision in low light conditions? - ANS It provides the only means
of seeing very dim objects in the dark.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ANSWERS GRADED A+ 2025/2026
What is the definition of 'night' according to 14 CFR part 1? - ANS The time between the end
of evening civil twilight and the beginning of morning civil twilight, as published in the Air
Almanac.
What is the significance of evening civil twilight? - ANS It begins when the geometric center
of the sun is 6 degrees below the horizon at sunset.
What are the requirements for a pilot to operate at night according to 14 CFR part 61? -
ANS The pilot must have made 3 takeoffs and landings to a full stop within the preceding 90
days during the specified night hours.
What is the time frame defined as 'night' for recent flight experience requirements? - ANS 1
hour after sunset to 1 hour before sunrise.
What is the primary physiological limitation affecting pilots during night operations? -
ANS Diminished vision in low-light conditions.
What part of the eye controls the amount of light entering? - ANS The pupil, which is
controlled by the iris.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,What is the function of the retina? - ANS To contain photosensitive cells (rods and cones) that
record images.
Where are cones primarily located in the eye? - ANS In the central area of the retina known
as the macula.
What is the role of rods in vision? - ANS They are used for low light intensity or night vision
and detect position references in shades of gray.
What is photopic vision? - ANS Vision during daytime or high-intensity artificial illumination
relying on central vision.
What is mesopic vision? - ANS Vision that occurs at dawn, dusk, or under full moonlight,
requiring both central and peripheral vision.
What is scotopic vision? - ANS Vision during nighttime or low light conditions where central
vision is ineffective.
What is the 'night blind spot'? - ANS An area in the central 5 to 10 degrees of the visual field
where objects may go undetected in low light.
How long does maximum dark adaptation take? - ANS Up to 30 minutes.
What effect do aircraft anti-collision lights have on night vision adaptation? - ANS They do not
impair night vision adaptation due to their short duration of exposure.
What is the function of the lens in the eye? - ANS To focus light on the surface of the retina.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What happens to the image of an object if looked at directly at night? - ANS The image may
fade away completely after a few seconds.
What is the role of the optic nerve in vision? - ANS To carry electrical signals from the rods
and cones to the brain for interpretation.
What is the primary function of the cones in the retina? - ANS To detect detail, perceive color,
and identify far-away objects in bright light.
What is the difference between rods and cones in terms of sensitivity? - ANS Rods are about
10,000 times more sensitive to light than cones.
What should pilots consider when flying at night? - ANS Physical limitations, equipment
requirements, procedures, and emergency situations.
What is the relationship between the fovea and night vision? - ANS The fovea lacks rods,
making it ineffective for night vision.
What is the effect of low ambient illumination on vision? - ANS It can cause the night blind
spot, making it difficult to detect objects directly viewed.
What is the importance of understanding eye function for pilots? - ANS It can lead to
behaviors that improve night vision significantly.
What is the role of peripheral vision in low light conditions? - ANS It provides the only means
of seeing very dim objects in the dark.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
