Which scenario is associated with Somatogravic Illusions?

• A. During rapid acceleration, forward thrust can be interpreted as nose-up pitch.
• B. During level flight, a sudden roll occurs without input.
• C. During descent, the horizon becomes the primary cue.
• D. During straight-and-level flight, a strong gust causes bank.

Answer: (A)

Somatogravic Illusions come from the inner ear’s response to linear acceleration. When you experience rapid acceleration, the otolith organs interpret that forward thrust as if the airplane’s nose were actually pitching up. The resulting sensation can make you think you’re nose-up, even though your attitude relative to the horizon hasn’t changed. The safety implication is clear: rely on your flight instruments—especially the attitude indicator and altimeter—to maintain the true pitch and avoid overreacting to the misleading feeling. This illusion can occur during strong acceleration, such as a high-thrust takeoff, and the opposite occurs with rapid deceleration. The other scenarios describe different perceptual effects or instrument cues, not this acceleration-related illusion.