Human Factors

Somatogravic Illusion on Night / IMC Takeoff

FAA Ref: FAA-S-ACS-6C Area I Task H (Human Factors)

Scenario & Physics Summary

Rapid forward acceleration on takeoff stimulates otolith organ otoliths, creating false sensation of steep pitch-up, prompting pilot to push nose DOWN into ground.

Interactive 3D Visual Plates & Scenario Media

Somatogravic Illusion on Night / IMC Takeoff Plate 1

Plate 1: Somatogravic Illusion on Night / IMC Takeoff

Somatogravic Illusion on Night / IMC Takeoff Plate 2

Plate 2: Somatogravic Illusion on Night / IMC Takeoff

Somatogravic Illusion on Night / IMC Takeoff Plate 3

Plate 3: Somatogravic Illusion on Night / IMC Takeoff

Somatogravic Illusion on Night / IMC Takeoff Plate 4

Plate 4: Somatogravic Illusion on Night / IMC Takeoff

Aerodynamic & Operational Physics

Otolith organs in inner ear sense linear acceleration and gravity vectors.
Forward acceleration creates a resultant inertial vector tilted backward.
Brain misinterprets backward vector as aircraft nose pitching UP.
Without visual horizon, pilot instinctively pushes stick forward, diving into terrain at high speed.

FAA Exam Gotcha Alert

FAA Exam Trap: Somatogravic illusion occurs during RAPID ACCELERATION (takeoff, go-around) in low visibility. Trust instruments, do NOT push nose down.

Frequently Asked Questions & Exam Explanations

What causes the somatogravic illusion during night takeoff?

Rapid forward acceleration tilts the inner ear gravity vector backward, tricking the brain into feeling a steep nose-high pitch attitude.

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