Human Factors for the CPL: Perception, Cognition, and Crew Performance
Why human factors matters to a commercial pilot
Human factors is the study of how people perform within aviation systems. For the CPL the examiner wants evidence that you understand the limits of human performance and the defences that compensate for them, not just a list of accident causes. Anchor your revision on the SHELL model (Software, Hardware, Environment, Liveware) and the Reason 'Swiss cheese' model: accidents usually result from several latent failures lining up, not a single error. Understand the difference between an error (unintended action), a violation (deliberate deviation) and a lapse (omission or memory failure).
Perception and cognition
Revise the sensory systems most relevant to flight: vision (rods and cones, dark adaptation, empty-field myopia, the black-hole approach illusion, somatogravic and somatogyral illusions) and hearing (spatial disorientation, noise-induced loss). Understand attention (selective, divided, vigilance decrement), workload (Yerkes-Dodson arousal curve, mental overload and underload), memory (short-term capacity, chunking, prospective memory) and decision-making (recognition-primed decision making, confirmation bias, plan continuation bias, hazardous attitudes).
Traps in exam questions
The most common trap is confusing an illusion with a control failure: for example, the somatogravic illusion during acceleration feels like a pitch-up, so the pilot pitches down. Another trap is the 'complacency' answer where 'fatigue' or 'poor communication' is the better fit. Watch for questions describing a crew where the junior pilot fails to challenge the captain: that is steep authority gradient, not lack of knowledge. Also distinguish stress (external pressure) from anxiety (internal response).
Worked rule of thumb
Use the '1-2-3' check for any human-factors scenario: (1) What is the human limitation? (2) What defence is missing? (3) What training or procedure would break the chain? For example, a fatigued pilot misses a checklist item: limitation is vigilance decrement; missing defence is cross-check; remedy is fatigue management and challenge-and-response.
Key concepts to name in answers
SHELL, Reason model, error versus violation, arousal and performance, sensory illusions, situational awareness (endsley's three levels), crew resource management, authority gradient, hazardous attitudes and the antidote attitudes.