26/08/2022
Five types of night flight illusions.🌃🛩️
Night flight is an entirely new way to experience the joy of flying. But like anything, night flying comes with its share of challenges and risks.
•Autokinesis:
This illusion happens when a pilot stares at a bright, stationary light set against a pitch-black background, such as a star or the light from another aircraft. After a few seconds, the light could appear to be moving toward the aircraft. In an attempt to avoid the impending “collision,” the pilot may become disoriented and lose control of the aircraft.
•The Black Hole Effect:
On dark nights, approaching an airport that has few lights or identifiable ground features can create an illusion that the aircraft is at a higher attitude than it actually is. The black hole illusion, also called the featureless terrain illusion, can result in the pilot flying a too-low approach and crashing short of the runway.
The black hole illusion can also occur when taking off from a brightly-lit airport into a pitch-black, featureless sky.
•Flicker Vertigo:
While rare, exposure to flickering lights can trigger an imbalance in brain-cell activity in some people, leading to disorientation, dizziness, nausea, confusion, headaches, and sometimes seizures and loss of consciousness. Flicker vertigo can be caused by a faulty light in the cockpit, beacon or navigation lights flickering through a rotating propeller, or other low-frequency flashing lights.
•False Horizons:
On dark nights when there’s no visible horizon, the brain can still trick itself into searching for a horizon to reference. For example, a sloping cloud formation, bright stars, or ground lights from a highway can create the illusion that the aircraft is not aligned with the horizon.
•Sloping Terrain Illusions
At night, an upward sloping runway or upward sloping terrain can create the illusion that the aircraft is higher than it actually is. To compensate, the pilot will fly a lower than normal approach, which could lead to a controlled flight into terrain accident.
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©Photo by Cirrus aircraft