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.

Key Takeaways:

• Visual illusions in aviation can cause dangerous spatial disorientation and misjudgments, especially during approach and landing, even in good visibility conditions.
• These illusions arise from conflicts between visual cues and the brain's other spatial orientation systems, often triggered by factors like runway slope or width, surrounding terrain, and unlit areas at night ("black holes").
• Pilots can mitigate these risks through pre-flight preparation, regular instrument flight practice, hands-on experience with disorientation simulators, and by trusting aircraft instruments over deceptive senses when an illusion is suspected, often opting to go around.

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