Which illusion involves confusion with ground lights rather than the horizon?

Which illusion involves confusion with ground lights rather than the horizon?

• A. False Horizon
• B. Induced Motion
• C. Coriolis Illusion
• D. Confusion w/ Ground Lights

Answer: (D)

Visual cues used to judge aircraft attitude can be misread when the true horizon isn’t visible. At night or in poor visibility, ground lights near the horizon can form a boundary that your brain interprets as the horizon. That illusion makes you adjust the airplane to align with those lights, not with the real horizon, which can put you in an unintended bank or pitch attitude. This differs from other horizon-related illusions in that the boundary line is created by ground lights themselves rather than a cloud bank or other non-horizon feature. The practical safeguard is to rely on the cockpit instruments and perform a disciplined instrument scan, especially during night flight over uniform terrain.

Visual cues used to judge aircraft attitude can be misread when the true horizon isn’t visible. At night or in poor visibility, ground lights near the horizon can form a boundary that your brain interprets as the horizon. That illusion makes you adjust the airplane to align with those lights, not with the real horizon, which can put you in an unintended bank or pitch attitude.

This differs from other horizon-related illusions in that the boundary line is created by ground lights themselves rather than a cloud bank or other non-horizon feature. The practical safeguard is to rely on the cockpit instruments and perform a disciplined instrument scan, especially during night flight over uniform terrain.