What percentage reliability is attributed to vision during flight?

• A. 60%
• B. 70%
• C. 80%
• D. 90%

Answer: (C)

Vision is the main source of orientation information in flight. The outside visual scene, especially the horizon, provides the majority of cues about attitude and motion, while the vestibular system and other senses can be misled by accelerations and unusual flight attitudes. Because of this reliance on sight, about 80% of the information the brain uses to maintain orientation during flight comes from vision. The other options underestimate or overstate vision’s role, making 80% the best choice.