Instrument Rating Exam · Mock exam

The 'leans' — a common vestibular illusion in IMC — occur because:

• A.The somatogravic illusion from forward acceleration causes the pilot to lean backward in the seat
• B.The Coriolis effect from head movements during turns confuses the vestibular system into sensing a lean
• C.The pilot's outside visual references are false, causing them to lean toward the apparent horizon seen in cloud
• D.A gradual bank below the canal threshold goes unnoticed; on sudden correction to level the pilot feels banked the other way and leans