Visual illusions can be a factor in any weather, but the low or changing visibility of instrument flying offers specific—and potentially deadly—visual challenges.
Not believing your eyes
Whats the worst that should happen if that wide runway seems further away? Well, you could end up too high and go around or you could simply land long, risking an overrun. Embarrassing, to be sure, possibly with expensive damage, but seldom much worse than that.
Key Takeaways:
- Instrument flying (IMC) significantly increases the risk of dangerous visual illusions and spatial disorientation, which can occur throughout all flight phases, from taxi and takeoff to approach and landing.
- Pilots may misinterpret runway dimensions, perceived speed, cloud formations as false horizons, or ground lights as stars, leading to errors in control, altitude, or distance judgment.
- The primary defense against these illusions is a thorough pre-flight review and planning, unwavering reliance on flight instruments (especially the attitude indicator), and the readiness to abort and revise plans if disoriented or unsure.
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