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100+ Free CPL Human Factors Practice Questions

Pass your CASA Commercial Pilot Licence (Aeroplane) — Human Factors (CHUF) exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: CPL Human Factors Exam

100

Practice Questions

OpenExamPrep

40

Official Questions

CASA

70%

Pass Mark

CASA

1.25 hrs

Time Limit

CASA

The CASA CPL Human Factors (CHUF) exam is a 40-question theory test assessing physiology, decision-making, and TEM. It requires a 70% passing score in a 1.25-hour time limit. This prep includes 100 high-quality practice questions.

Sample CPL Human Factors Practice Questions

Try these sample questions to test your CPL Human Factors exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following is a classic early symptom of hypoxic hypoxia in flight?
A.Tingling in the fingers and toes, combined with muscle rigidity
B.Severe chest pain and muscle spasms in the legs
C.Sudden loss of hearing and severe vomiting
D.Cyanosis and a false sense of well-being (euphoria)
Explanation: Hypoxic hypoxia results from a reduced partial pressure of oxygen at altitude. Its insidious nature is characterized by a false sense of well-being (euphoria) and physical signs like cyanosis (blue coloring of lips and fingernails), making it difficult for the pilot to recognize their own impairment.
2What is the approximate Time of Useful Consciousness (TUC) for a pilot at an altitude of 25,000 feet following a normal decompression?
A.1 to 2 minutes
B.30 to 45 seconds
C.3 to 5 minutes
D.10 to 12 minutes
Explanation: At 25,000 feet, the pressure is significantly reduced, resulting in a TUC of 3 to 5 minutes under normal decompression conditions. Rapid decompression can halve this time due to rapid air expansion and forced exhalation from the lungs.
3A pilot experiencing anxiety or panic starts breathing rapidly. What is the physiological consequence of this action?
A.Hypoxia, leading to an increase in blood acidity and hypercapnia
B.Nitrogen bubbling in the joints, causing decompression sickness
C.Carbon monoxide poisoning, restricting oxygen binding to hemoglobin
D.Hyperventilation, leading to excessive carbon dioxide loss and respiratory alkalosis
Explanation: Hyperventilation is the rapid and deep breathing that exceeds the body's metabolic need, resulting in the excessive elimination of carbon dioxide (CO2). This leads to a rise in blood pH (alkalosis), causing symptoms like tingling in the fingers and lightheadedness.
4How can a pilot distinguish hyperventilation from hypoxic hypoxia in flight if the symptoms overlap?
A.By checking for cyanosis, which only occurs in hyperventilation
B.By ascending to a higher altitude to check if the symptoms worsen
C.By breathing slowly or using a paper bag; if symptoms resolve, it was hyperventilation
D.By taking deep, rapid breaths to increase oxygen levels quickly
Explanation: Because hyperventilation and hypoxia share symptoms like tingling and dizziness, the safest response is to slow the breathing rate (or breathe into a bag to re-breathe CO2). If symptoms improve, it was hyperventilation. If not, supplemental oxygen must be immediately administered to treat potential hypoxia.
5What is the primary source of carbon monoxide (CO) contamination in a light aircraft cabin?
A.Degradation of cabin seat cushions due to solar radiation
B.Incomplete combustion of fuel entering through open windows during taxi
C.Outgassing of standard aviation gasoline from the wing tanks
D.A crack in the engine exhaust shroud or cabin heater heat exchanger
Explanation: In light aircraft, cabin heat is typically provided by passing ambient air over a shroud surrounding the engine exhaust pipe. If the exhaust pipe or shroud develops a crack, carbon monoxide-rich exhaust gases leak directly into the cabin heating duct and enter the cockpit.
6Why is carbon monoxide (CO) poisoning particularly hazardous to pilots?
A.It causes severe pain in the inner ear during ascent, distracting the pilot
B.It acts as a nervous system stimulant, causing hyperactive movements
C.It instantly destroys night vision by damaging the rods in the retina
D.It is odorless, colorless, and CO binds to hemoglobin with over 200 times the affinity of oxygen
Explanation: Carbon monoxide is an odorless, colorless gas that is virtually undetectable without dedicated sensors. It binds to hemoglobin with over 200 times the affinity of oxygen, forming carboxyhemoglobin, which prevents oxygen transport to vital tissues, leading to anemic hypoxia.
7Which organ system is responsible for sensing angular acceleration (rotation) in flight?
A.Proprioceptive receptors (seat-of-the-pants) in the spine
B.Otolith organs (utricle and saccule) in the middle ear
C.Semicircular canals in the inner ear vestibular system
D.Cochlear nerve cells located in the auditory canal
Explanation: The inner ear's vestibular system contains three semicircular canals arranged in orthogonal planes. They contain fluid (endolymph) and hair cells that detect angular acceleration (rotation) when the head turns or the aircraft banks.
8What causes the 'graveyard spin' illusion?
A.Rapid acceleration on takeoff, creating the sensation of a steep climb
B.A sudden change in runway width, making the pilot feel too low
C.Adapting to a prolonged spin, which makes the recovery feel like entering a spin in the opposite direction
D.Staring at a single light source at night, causing it to appear to drift
Explanation: During a prolonged spin, the fluid in the semicircular canals stops moving due to friction, and the sensation of spinning ceases. When the pilot applies rudder to recover, the fluid moves in the opposite direction, creating a strong illusion of spinning in the opposite direction. If the pilot trusts this sensation and corrects, they re-enter the original spin.
9If a pilot accelerates rapidly on takeoff in poor visibility, what vestibular illusion are they susceptible to?
A.Somatogravic illusion, creating the false sensation of a nose-up pitch or climb
B.Coriolis illusion, causing a sensation of tumbling in multiple axes
C.The leans, causing the pilot to feel they are in a bank
D.Flicker vertigo, causing dizziness due to engine strobe lights
Explanation: Forward acceleration causes the otoliths in the utricle and saccule to slide backward. Without visual references, the brain interprets this backward displacement of the otoliths exactly like a nose-up pitch. A pilot reacting to this illusion might push the nose down, flying into the ground.
10What is the Coriolis illusion, and when does it occur?
A.The visual drift of a stationary object when viewed during night flight
B.The inability of the eye to focus on distant objects in a featureless sky
C.An overwhelming sensation of tumbling caused by moving the head out of the plane of rotation during a prolonged turn
D.The sensation of a slow turn caused by a gradual roll below the vestibular threshold
Explanation: The Coriolis illusion occurs when a pilot moves their head quickly (e.g., looking down to pick up a chart) during a prolonged, constant-rate turn. This stimulates a second and third semicircular canal, creating a highly disorienting sensation of tumbling or rotating in an entirely different plane.

About the CPL Human Factors Exam

The CASA CPL Human Factors Exam (CHUF) is a mandatory subject for the Commercial Pilot Licence in Australia. It tests a pilot's understanding of human physiology in flight (hypoxia, hyperventilation, spatial disorientation, visual illusions, g-forces), aviation psychology (situational awareness, decision-making, stress management, fatigue), crew resource management (CRM), and threat and error management (TEM) principles.

Assessment

Closed-book computer-based exam administered at ASPEQ testing centers. Permitted materials include calculators.

Time Limit

1.25 hours

Passing Score

70%

Exam Fee

Approx. $150 - $250 AUD (varies by provider) (CASA / ASPEQ Exam Delivery)

CPL Human Factors Exam Content Outline

25%

Human Physiology

Atmospheric physiology, respiration, circulation, hypoxia, hyperventilation, vision, hearing, and balance

25%

Aviation Psychology

Information processing, memory, situational awareness, decision-making, judgment, stress, and fatigue

20%

Crew Resource Management (CRM)

Communication, leadership, barriers, cockpit environment, and passenger management

20%

Threat & Error Management (TEM)

Threat classification, error detection, countermeasures, and risk management in CPL ops

10%

Safety Culture & Reporting

Accident analysis, hazard identification, and incident reporting systems

How to Pass the CPL Human Factors Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: Closed-book computer-based exam administered at ASPEQ testing centers. Permitted materials include calculators.
  • Time limit: 1.25 hours
  • Exam fee: Approx. $150 - $250 AUD (varies by provider)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

CPL Human Factors Study Tips from Top Performers

1Memorize the symptoms of hypoxia versus hyperventilation — hypoxia symptoms include cyanosis and euphoria, while hyperventilation often starts with tingling in fingers and rapid breathing
2Understand the various visual illusions, especially the autokinetic effect, runway width/slope illusions, and empty field myopia
3Study Threat and Error Management (TEM) definitions: understand the difference between environmental threats (e.g., weather) and operational threats (e.g., ATC delays), and how to apply countermeasures

Frequently Asked Questions

What is the passing score for the CPL CHUF exam?

The passing score is 70%.

What materials can I bring to the exam?

You are permitted to use a basic calculator. Visual Flight Rules Guide (VFRG) or AIP may be used as references.