Definition
A visual illusion that occurs at night when a pilot approaches a runway over featureless, unlit terrain or water with no visible horizon or ground references. The lack of visual cues between the aircraft and the runway causes the pilot to perceive the aircraft as being higher than it actually is, leading to a tendency to fly a dangerously low approach.
Plain English
On a dark night, when there is nothing lit up between you and the runway, your eyes have no way to judge how high you really are. The runway lights look like they are floating in space, and you tend to think you are too high when you are actually too low. Pilots flying this kind of approach often descend below a safe path without realising it.
Context Anchor
Encountered on night approaches over water, unlit terrain, or sparsely lit areas where the runway lights are visible but the ground around them is not.
Derivation
The term 'black hole' is borrowed from astronomy, where it describes a region so dark that no light escapes. Pilots adopted the phrase because the area surrounding the runway on these approaches looks the same way: a complete absence of visible features, with only the runway lights showing.
Why Pilots Care
Failing to recognize the illusion often results in a low, unstable approach and increases the risk of controlled flight into terrain.
Analogy
It is like judging how far away a single lamp is in a dark field. With nothing around it for comparison, your eyes can give you the wrong sense of distance and height.
Grounding Statement
Picture a runway floating in darkness with no roads, trees, buildings, or ground lights between you and the threshold; that missing visual information is what creates the illusion.
Intuition Check
“Black hole” does not mean the runway is unsafe or physically different. It means the darkness around the runway removes the normal visual clues your eyes use to judge height and distance.
Example Sentence 1
On the night approach to the small coastal airport, the instructor warned the student about the black hole approach illusion and told her to monitor the VASI carefully.
Example Sentence 2
Remote airports with no town lights nearby are classic places to expect a black hole approach illusion.