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Commercial pilot · ACS CA.I.H · lesson pack

Human Factors (Commercial)

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Why this one matters

A commercial pilot is paid to make good decisions under pressure, often tired and with people watching. Most accidents trace to the pilot, not the airplane: a hazardous attitude, an unrecognized physiological problem, or a mind that heard what it expected. Recognizing these in yourself is a professional skill.

1 · Know these cold

  • •No flying within 8 hours of drinking alcohol, while under its influence, or with a blood alcohol of 0.04 or more.(14 CFR 91.17)
  • •A motor vehicle action is a conviction for driving while intoxicated or impaired, or a license suspended, revoked, cancelled or denied for an alcohol- or drug-related cause. Report each in writing to the FAA Security and Investigations Division within 60 days. An arrest alone, with no conviction or license action, isn't one.(14 CFR 61.15(c), (e))
  • •Oxygen (cabin pressure altitudes): the required crew must be provided with and use it above 12,500 feet MSL up to and including 14,000 for any time over 30 minutes, and at all times above 14,000; above 15,000, every occupant must be provided with it.(14 CFR 91.211(a))
  • •After scuba diving, wait at least 12 hours before flying up to 8,000 feet, and 24 hours for higher altitudes or after a dive that needed a controlled ascent.(AIM 8-1-2)
  • •Five hazardous attitudes, each with an antidote: anti-authority, impulsivity, invulnerability, macho, resignation.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeronautical Decision-Making)
  • •Confirmation and expectation bias make you see what you expect, like the clearance you expected or the forecast you hoped for. Read back and cross-check.(Risk Management Handbook (FAA-H-8083-2A))
  • •Single-pilot resource management: use every resource (ATC, automation, checklists, passengers) and manage workload before it peaks.(Risk Management Handbook (FAA-H-8083-2A))

2 · The lesson

Physiology
  • Hypoxia: lack of oxygen, with euphoria, headache, poor judgment and cyanosis. Types: hypoxic (altitude), hypemic (blood, including carbon monoxide), stagnant and histotoxic (alcohol, drugs). Use oxygen and descend.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Hyperventilation: breathing too fast, often from stress; tingling and dizziness. Slow your breathing, or talk out loud. Its symptoms look like hypoxia's: at altitude, treat for hypoxia first (oxygen on, descend), then slow your breathing.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors; AIM 8-1-2, 8-1-3)
  • Middle ear and sinus: a cold or allergy can block the passages, so the pressure can't equalize, mostly in the descent: sharp pain, muffled hearing, even a ruptured eardrum. Don't fly congested; if it happens, climb back up a little and descend slowly, using a Valsalva.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Spatial disorientation: the inner ear misleads without a visual horizon: the leans after a slow roll, a graveyard spiral, a false climb when accelerating (somatogravic). Recognize it by a conflict between the feeling and the instruments; trust the instruments, or avoid the conditions without an instrument rating.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors; AIM 8-1-5)
  • Optical illusions on landing: a narrow or upsloping runway makes you feel high (you fly low); a wide or downsloping one, low (you fly high); featureless terrain, water or haze make you fly low. Use the VASI or PAPI, a known pattern and the altimeter.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors; AIM 8-1-5)
  • Motion sickness: nausea, sweating, pallor. Fresh air, eyes outside on the horizon, smooth flying, and land if needed.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Carbon monoxide from a cabin heater leak: headache and drowsiness. Heater off, fresh air, land.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Stress: shows as tension, poor sleep, distraction or irritability; acute stress from an emergency, chronic from life. Notice it, simplify the flight or stay on the ground.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Fatigue: slower reactions, missed radio calls, poor judgment, the same impairment as alcohol. Causes are short sleep, long duty and time of day. The fix is rest; caffeine only masks it.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Dehydration and nutrition: headache, fatigue, cramps, dizziness; hot cockpits and altitude dry you out. Drink before you're thirsty and eat regular meals: low blood sugar dulls judgment too.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Hypothermia: cold exposure (an open cockpit, winter, a forced landing) brings shivering, confusion and clumsy hands. Dress for the outside temperature, carry survival gear, and get warm.(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeromedical Factors)
  • Decompression sickness after scuba diving: nitrogen bubbles bring joint pain and worse. Wait at least 12 hours before flying up to 8,000 feet, 24 hours above that or after a dive that needed a controlled ascent.(AIM 8-1-2)
Alcohol, drugs and medications
  • The 8-hour, influence and 0.04 rules are minimums. Alcohol impairs judgment and worsens hypoxia; many pilots use 24 hours.(14 CFR 91.17)
  • Over-the-counter drugs, especially antihistamines, can impair you. Don’t fly while using a drug that affects your faculties, and check with an AME.(14 CFR 61.53; 91.17)
  • Report alcohol- or drug-related motor vehicle actions within 60 days.(14 CFR 61.15(e))
Decisions and attitudes
  • Hazardous attitudes and antidotes: anti-authority ("follow the rules, they’re usually right"), impulsivity ("not so fast, think first"), invulnerability ("it could happen to me"), macho ("taking chances is foolish"), resignation ("I’m not helpless. I can make a difference.").(Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeronautical Decision-Making)
  • Use a decision model such as DECIDE or 3P (perceive, process, perform). SRM uses every resource when you fly alone (ATC, automation, checklists, passengers); CRM is the same idea with a crew: brief roles, speak up, and cross-check each other.(Risk Management Handbook (FAA-H-8083-2A))
  • Before each flight, check yourself with IMSAFE (Illness, Medication, Stress, Alcohol, Fatigue, Emotion or Eating) and the flight with PAVE (Pilot, Aircraft, enVironment, External pressures), against personal minimums you wrote down in advance.(Risk Management Handbook (FAA-H-8083-2A); Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Aeronautical Decision-Making)
Attention and bias
  • Prioritize: aviate, navigate, communicate. Brief tasks before high-workload phases.(Risk Management Handbook (FAA-H-8083-2A))
  • Confirmation bias: you favor information that supports your plan. Expectation bias: you hear the clearance you expected. Read back carefully and question what fits too neatly.(Risk Management Handbook (FAA-H-8083-2A))

Want it all on one page, with scenarios? Read the full lesson.

3 · Say it out loud

Answer each one out loud, then check yourself and mark how it went.

  1. Remember Recall it

    “What are the oxygen requirements for the crew?”

  2. Understand Explain why

    “Why is hypoxia so dangerous?”

  3. Apply Use it on a flight

    “You’ve been on duty 11 hours. The customer wants one more flight before dark and offers a bonus. What do you do?”

4 · Common mistakes

  • Treating the alcohol rule as a target.

    Impairment lasts longer than 8 hours.

    Instead: Use a much longer personal rule.

  • Not recognizing your own hazardous attitude.

    Attitudes feel normal from inside.

    Instead: Learn the five and say the antidote out loud.

  • Ignoring fatigue for income.

    Fatigue impairs like alcohol.

    Instead: Set duty limits for yourself.

5 · Quick check

Answer, then reveal. Flag anything you want to see again.

  1. 1. Alcohol rules for a pilot?

  2. 2. When must passengers be provided oxygen?

  3. 3. Antidote to invulnerability?

  4. 4. Deadline to report a DUI to the FAA?

  5. 5. What causes hypemic hypoxia?

  6. Scenario6. You realize you’re rushing to beat weather "just this once" with a customer aboard. Which hazardous attitude is it, and what do you do?

Trained it? Now prove it: practice human factors (commercial) out loud with our examiner.

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Connect it

One situation that runs across this lesson and its neighbors in the same ACS area. Decide first, then check.

Connect it · Preflight Preparation

A week after your checkride, a friend's company offers to pay you to fly three employees to a meeting in a rented 172. They want to leave at 6 a.m.; you have a full workday before.

Can you take the job, and what else matters? Decide, then see the worked answer

It turns on who provides the airplane and who has operational control. If you rent the 172 and provide the company pilot plus airplane, that's carrying persons for compensation, and offering it (holding out, under AC 120-12A) makes it common carriage. That needs an operator certificate under Part 119, with the flight run as an on-demand Part 135 operation, so decline. The lawful version is the company renting or leasing the airplane in its own name, holding operational control, and paying you only to fly it. That's a Part 91 flight, and your commercial certificate lets you be paid as its pilot (the FAA's Green (1993) and Ferris (1990) interpretations draw this line). None of the 119.1(e) exceptions, such as student instruction, nonstop commercial air tours under 91.147, ferry or training flights, or aerial work like banner towing, covers flying a company's employees to a meeting. 91.409(b) requires a 100-hour inspection for an aircraft carrying any person, other than a crewmember, for hire, or used for flight instruction for hire in an airplane the instructor provides. Company employees flown on the company's own business, without being charged, aren't passengers for hire in that sense, so it doesn't automatically apply to the Part 91 version; check the airplane's inspections either way. Then check yourself: a second-class medical for commercial privileges, a current flight review, and three takeoffs and landings in the last 90 days to carry passengers. Without an instrument rating, 61.133(b)(1) bars carrying passengers for hire on cross-countries over 50 NM or at night. Part 91 has no duty or rest limits, so fatigue is yours to manage: run IMSAFE honestly, and a 6 a.m. report after a full workday needs a real sleep opportunity first. If you won't get one, decline or move the departure. Pressure to please a client makes the call harder, not different.

14 CFR 61.23, 61.56, 61.57, 61.133, 91.409(b), 119.1; AC 120-12A; Risk Management Handbook (FAA-H-8083-2A)

Brings together: Pilot Qualifications · Airworthiness Requirements · Human Factors

Teaching this? The instructor lesson plan →

Study aid, not FAA guidance. Sources: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C); Risk Management Handbook (FAA-H-8083-2A); Aeronautical Information Manual (AIM); 14 CFR; Commercial Pilot ACS (FAA-S-ACS-7B). Checked against current sources 2026-11-13.