Human Factors
Study aeromedical factors, aeronautical decision-making, hazardous attitudes, hypoxia, and spatial disorientation.
Overview
Human factors account for the majority of aviation accidents. This area covers both physiological challenges (hypoxia, spatial disorientation, vision limitations) and decision-making frameworks (ADM, CRM, hazardous attitudes). Understanding human limitations is as important as understanding the aircraft.
Why This Matters
The FAA increasingly emphasizes decision-making and human factors because most accidents are caused by pilot error, not mechanical failure. Questions in this area test whether you can recognize your own limitations and make safe decisions under pressure.
Exam Weight
Expected Questions
4-6 questions
Difficulty
Low to Moderate
Notes
Questions focus on identifying hazardous attitudes, recognizing physiological symptoms, and applying decision-making models. Relatively straightforward compared to other topics.
Key Concepts
The 6 essential concepts you need to understand for this topic.
Aeronautical Decision-Making (ADM)
ADM is a structured approach to risk management in flight. The DECIDE model: Detect, Estimate, Choose, Identify, Do, Evaluate. ADM emphasizes that good decisions come from recognizing hazards, assessing risk, and choosing the safest course of action — before the situation becomes critical.
Five Hazardous Attitudes
Anti-authority ("Don't tell me"), Impulsivity ("Do it quickly"), Invulnerability ("It won't happen to me"), Macho ("I can do it"), Resignation ("What's the use?"). Each has an antidote. Recognizing these attitudes in yourself is the first step to mitigating them.
Hypoxia
Hypoxia is oxygen deficiency affecting brain function. Symptoms begin as low as 5,000 feet at night and 10,000 feet during the day. Symptoms include euphoria, impaired judgment, reduced vision, and cyanosis. Supplemental oxygen is required above 12,500 MSL for 30+ minutes and above 14,000 MSL at all times.
Spatial Disorientation
The vestibular system can be fooled in flight, especially in IMC. The leans, graveyard spiral, and somatogravic illusion are common forms. The solution: trust your instruments, not your body. If you suspect disorientation, focus on the attitude indicator and avoid abrupt control inputs.
IMSAFE Checklist
A personal fitness-for-flight checklist: Illness, Medication, Stress, Alcohol, Fatigue, Eating/Emotion. Use this before every flight to assess whether you're physically and mentally fit to fly. Any item that's questionable is a reason to delay the flight.
Vision Limitations
At night, the fovea (central vision) has reduced capability. Use off-center vision to detect dim objects. Dark adaptation takes 30 minutes. Bright lights (especially white) destroy night adaptation. Red instrument lighting preserves it.
Common Mistakes
Confusing the five hazardous attitudes with each other — practice matching each attitude to its antidote.
Not recognizing that hypoxia symptoms begin well below the oxygen-required altitudes.
Thinking spatial disorientation only affects instrument-rated pilots — VFR pilots inadvertently entering IMC are at highest risk.
Forgetting the 8-hour "bottle-to-throttle" rule is a minimum — alcohol effects on judgment and performance can last much longer.
Overlooking fatigue as a factor — it impairs judgment as much as moderate alcohol consumption.
Study Tips
Memorize the five hazardous attitudes and their antidotes — they're tested on every exam.
Know the oxygen requirements by altitude: 12,500-14,000 MSL (crew after 30 min), above 14,000 (crew at all times), above 15,000 (all occupants).
Practice the IMSAFE checklist before real flights — it makes the concept stick for the exam.
Understand the types of hypoxia (hypoxic, hypemic, stagnant, histotoxic) and what causes each.
Study night vision physiology — it appears frequently and is easy to memorize.
FAA References
Pilot's Handbook of Aeronautical Knowledge (PHAK)
Chapter 17 — Aeromedical Factors
Pilot's Handbook of Aeronautical Knowledge (PHAK)
Chapter 2 — Aeronautical Decision-Making
Sample Questions
Test your knowledge with these representative questions from the FAA exam.
1. The antidote to the "Macho" hazardous attitude is:
Explanation: The Macho attitude ("I can do it") is countered by "Taking chances is foolish." This reminds the pilot that proving capability isn't worth risking safety.
2. What is the primary defense against spatial disorientation?
Explanation: The vestibular system is unreliable in flight. The primary defense is to trust the flight instruments — particularly the attitude indicator — over physical sensations.
3. Supplemental oxygen is required for the flight crew at cabin pressure altitudes above:
Explanation: Per 14 CFR 91.211: above 12,500 MSL up to 14,000 MSL, crew must use supplemental O2 after 30 minutes. Above 14,000 MSL, crew must use O2 at all times. Above 15,000 MSL, all occupants must be provided O2.
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