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Getting Disoriented

You just broke out of the clag on final, late in the day, with the weather at minimums, when illusion strikes. Are you low on the approach? High? Not sure? At the last moment you realize you’re high and long; time to go missed. Maybe it worked the other way around; you’re on approach and as you get to where you expect the threshold marks to pass below you realize you’re low, short and about to touch down—short of the runway. At its worst, these vision deceptions can contribute to spatial disorientation in VMC that’s more confusing than the dizziness of becoming disoriented inside the eggshell of IMC.

Gemini Sparkle

Key Takeaways:

  • Pilots are vulnerable to visual illusions, even in good weather, which can cause dangerous misjudgments of altitude and position during approaches by tricking the brain's interpretation of visual cues.
  • These illusions are often caused by factors such as runway slope, varying dimensions (long/narrow vs. wide), surrounding terrain, and the absence of peripheral vision cues during night approaches (e.g., "black hole" effect).
  • To mitigate risks, pilots should acquire pre-flight airport knowledge, undergo specific illusion training, maintain strong instrument flying skills, and always prioritize trusting instruments over misleading senses, executing a go-around if uncertainty arises.
See a mistake? Contact us.

You just broke out of the clag on final, late in the day, with the weather at minimums, when illusion strikes. Are you low on the approach? High? Not sure? At the last moment you realize you’re high and long; time to go missed. Maybe it worked the other way around; you’re on approach and as you get to where you expect the threshold marks to pass below you realize you’re low, short and about to touch down—short of the runway.

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