CPL Human Factors and CRM 2 — Questions and Answers
Question 1: Which vestibular illusion occurs when a pilot in a prolonged coordinated turn perceives the aircraft as wings-level and interprets a return to straight-and-level flight as a turn in the opposite direction?
- Graveyard spiral
- The leans (Correct answer)
- Coriolis illusion
- Somatogravic illusion
Correct answer: The leans
The leans occur when the semicircular canals adapt to a prolonged turn, causing the pilot to feel banked when actually wings-level.
Question 2: A pilot simultaneously tilts their head while in a prolonged constant-rate turn, triggering stimulation of all three semicircular canals. This best describes which illusion?
- The leans
- Somatogravic illusion
- Coriolis illusion (Correct answer)
- Elevator illusion
Correct answer: Coriolis illusion
The Coriolis illusion results from head movement during a sustained turn, causing an overwhelming sensation of tumbling or rotation.
Question 3: During a rapid catapult-type acceleration on takeoff, a pilot may falsely perceive a nose-high attitude and push forward on the controls. This is an example of which illusion?
- Leans illusion
- Graveyard spiral
- Somatogravic illusion (Correct answer)
- Autokinesis
Correct answer: Somatogravic illusion
The somatogravic illusion causes the otolith organs to interpret linear acceleration as a pitch-up attitude.
Question 4: Visual autokinesis is most likely to cause spatial disorientation under which condition?
- Bright daylight with multiple visual references
- Staring at a single stationary light in a dark environment (Correct answer)
- Flying in IMC with functioning instruments
- High-workload approaches in VMC
Correct answer: Staring at a single stationary light in a dark environment
Autokinesis occurs when a pilot fixates on a single stationary light point in darkness, causing it to appear to move.
Question 5: The 'black-hole approach' illusion is most dangerous because it causes the pilot to:
- Believe the aircraft is too high on the glidepath and dive steeply (Correct answer)
- Perceive the runway as closer than it actually is
- Misjudge crosswind component and land off-centerline
- Experience false horizon illusions from terrain lighting
Correct answer: Believe the aircraft is too high on the glidepath and dive steeply
The black-hole illusion—featureless terrain between the aircraft and runway—causes pilots to fly a dangerously low approach, often below the glidepath.
Question 6: Which factor most significantly reduces a pilot's ability to detect spatial disorientation through proprioceptive (seat-of-the-pants) cues?
- Flying in turbulence at high altitude
- Coordinated flight where all forces act symmetrically (Correct answer)
- Rapid cycling of control inputs
- Low ambient cabin temperature
Correct answer: Coordinated flight where all forces act symmetrically
In coordinated flight, proprioceptive cues feel normal regardless of actual attitude, making them unreliable for detecting disorientation.
Question 7: A CPL candidate experiencing mild hypoxia at altitude is MOST likely to first notice which symptom?
- Severe headache and tunnel vision
- Cyanosis of the lips and fingernails
- Euphoria, impaired judgment, and overconfidence (Correct answer)
- Immediate loss of motor coordination
Correct answer: Euphoria, impaired judgment, and overconfidence
Early hypoxia typically produces subtle cognitive effects such as euphoria and impaired judgment before obvious physical symptoms appear.
CPL Human Factors and CRM 2
Which vestibular illusion occurs when a pilot in a prolonged coordinated turn perceives the aircraft as wings-level and interprets a return to straight-and-level flight as a turn in the opposite direction?