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100+ Free SACAA CPL Human Performance Practice Questions

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Sample SACAA CPL Human Performance Practice Questions

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

1What is the approximate volumetric composition of dry air in the lower atmosphere (troposphere)?
A.78% Nitrogen, 21% Oxygen, and 1% Argon, Carbon Dioxide, and trace gases
B.50% Oxygen, 40% Nitrogen, and 10% Water Vapor
C.78% Oxygen, 21% Nitrogen, and 1% Carbon Dioxide
D.60% Nitrogen, 30% Oxygen, and 10% Inert Gases
Explanation: Dry atmospheric air consists of approximately 78.08% nitrogen, 20.95% oxygen, 0.93% argon, and roughly 0.04% carbon dioxide and trace gases. This constant composition holds true up to roughly 60,000 feet, though atmospheric pressure decreases with altitude.
2According to Dalton's Law of Partial Pressures, if atmospheric pressure at 18,000 ft is 506 hPa, what is the partial pressure of oxygen (PO2) in dry ambient air at this altitude?
A.Approximately 106 hPa
B.Approximately 212 hPa
C.Approximately 50.6 hPa
D.Approximately 380 hPa
Explanation: Dalton's Law states that the total pressure of a gas mixture equals the sum of the partial pressures of its component gases. Since dry air is 21% oxygen, partial pressure PO2 = 0.21 x 506 hPa = 106.26 hPa (compared to ~212 hPa at sea level).
3Using Boyle's Law (P1 x V1 = P2 x V2), how will a trapped gas volume of 100 mL in a pilot's gastrointestinal tract at sea level (1013 hPa) expand if the aircraft climbs unpressurised to 18,000 ft where atmospheric pressure is 506 hPa?
A.It will expand to approximately 200 mL (double its original volume)
B.It will expand to approximately 400 mL (quadruple its original volume)
C.It will contract to approximately 50 mL (half its original volume)
D.It will remain unchanged at 100 mL
Explanation: Boyle's Law states that at a constant temperature, gas volume is inversely proportional to pressure. Since ambient pressure at 18,000 ft (506 hPa) is half that of sea level (1013 hPa), V2 = (1013 x 100) / 506 = 200 mL.
4Which gas law explains why dissolved nitrogen comes out of solution in body tissues to form bubbles during a rapid ambient pressure drop, causing Decompression Sickness (DCS)?
A.Henry's Law
B.Charles's Law
C.Graham's Law
D.Gay-Lussac's Law
Explanation: Henry's Law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of that gas above the liquid. When ambient pressure decreases rapidly, dissolved nitrogen comes out of solution, forming bubbles in blood and body tissue.
5What type of hypoxia is caused by a reduced partial pressure of oxygen in inspired air, preventing adequate oxygen transfer across the alveolar membrane?
A.Hypoxic Hypoxia (Altitude Hypoxia)
B.Hypemic Hypoxia (Anemic Hypoxia)
C.Stagnant Hypoxia (Ischemic Hypoxia)
D.Histotoxic Hypoxia
Explanation: Hypoxic hypoxia occurs when there is an insufficient partial pressure of oxygen in inspired air (such as at high altitude), resulting in inadequate oxygen loading of blood in the pulmonary capillaries.
6Carbon monoxide (CO) inhalation reduces the oxygen-carrying capacity of the blood and causes which specific category of hypoxia?
A.Hypemic Hypoxia
B.Hypoxic Hypoxia
C.Stagnant Hypoxia
D.Histotoxic Hypoxia
Explanation: Hypemic hypoxia (anemic hypoxia) occurs when the blood's hemoglobin cannot bind or transport oxygen efficiently. Carbon monoxide binds to hemoglobin with ~200-250 times greater affinity than oxygen, forming carboxyhemoglobin.
7High positive vertical acceleration (+Gz) causes blood to pool in the lower body, reducing cardiac output and causing which form of hypoxia in the brain?
A.Stagnant Hypoxia
B.Hypoxic Hypoxia
C.Hypemic Hypoxia
D.Histotoxic Hypoxia
Explanation: Stagnant hypoxia occurs when blood flow to tissues is reduced or restricted. High +Gz forces pull blood away from the head into the lower extremities, impairing cerebral circulation.
8Severe alcohol ingestion or cyanide poisoning impairs cellular cytochrome oxidase enzymes, preventing cells from using oxygen. This causes:
A.Histotoxic Hypoxia
B.Hypemic Hypoxia
C.Stagnant Hypoxia
D.Hypoxic Hypoxia
Explanation: Histotoxic hypoxia occurs when oxygen is delivered normally to body tissues by blood, but toxic substances (such as alcohol, cyanide, or narcotics) prevent tissue cells from utilizing it.
9Which physiological stage of hypoxia occurs between 10,000 ft and 15,000 ft MSL, characterized by increased respiratory rate, elevated pulse, impaired night vision, and mild psychological euphoria?
A.Compensatory Stage
B.Indifferent Stage
C.Disturbance Stage
D.Critical Stage
Explanation: The Compensatory Stage (10,000 to 15,000 ft) is marked by bodily mechanisms (increased respiration and heart rate) attempting to compensate for lower PO2. Symptoms include euphoria, false security, and impaired night vision.
10What is the expected Time of Useful Consciousness (TUC) for a pilot at FL350 following a normal cabin pressure failure?
A.30 to 60 seconds
B.3 to 5 minutes
C.10 to 12 minutes
D.15 to 20 seconds
Explanation: At FL350 (35,000 ft), standard TUC ranges from 30 to 60 seconds under moderate activity. TUC represents the period during which a pilot can perform purposeful flight tasks before losing useful consciousness.

About the SACAA CPL Human Performance Exam

The SACAA CPL Human Performance & Limitations examination is a mandatory 30-question, 90-minute computer-based theoretical knowledge exam administered under South African Civil Aviation Regulations (SA-CARs/CATS 61). It tests commercial pilot knowledge across aviation physiology (respiration, hypoxia, hyperventilation, altitude effects, ear/sinus barotrauma, decompression sickness, vision, spatial disorientation, illusions, vestibular system) and aviation psychology (information processing, memory, attention, fatigue, circadian dysrhythmia, stress, decision-making, CRM, TEM, communication, hazardous attitudes).

Questions

30 scored questions

Time Limit

90 minutes

Passing Score

75%

Exam Fee

R450 per subject sitting under SACAA Part 187 user fees (South African Civil Aviation Authority (SACAA))

SACAA CPL Human Performance Exam Content Outline

18%

Atmosphere, Respiration and Hypoxia

Atmospheric pressure, gas laws, alveolar gas exchange, 4 types of hypoxia, TUC/EPT, hyperventilation, barotrauma, DCS, and oxygen systems.

10%

Circulation, Blood and Acceleration

Circulatory system, oxygen transport, carbon monoxide poisoning, smoking effects, +Gz/-Gz acceleration, G-LOC, greyout, and AGSM.

15%

Vision and Visual Illusions in Flight

Eye anatomy, rods and cones, dark adaptation, night vision scanning, empty-field myopia, autokinesis, black-hole approach, and runway perspective illusions.

15%

Hearing, Vestibular System and Spatial Disorientation

Ear anatomy, semicircular canals, otoliths, spatial disorientation types, vestibular illusions (leans, Coriolis, graveyard spin, somatogravic illusion), and noise-induced hearing loss.

10%

Information Processing, Attention and Memory

Sensory, working, and long-term memory, selective and divided attention, perceptual expectations, workload, and situational awareness.

12%

Fatigue, Stress, Sleep and Circadian Dysrhythmia

NREM/REM sleep cycles, sleep debt, acute vs chronic fatigue, circadian rhythms, jet lag phase shift, stress models, and coping mechanisms.

12%

ADM, Judgement, CRM and Threat & Error Management

Hazardous attitudes and antidotes, DECIDE model, CRM principles, leadership, TEM framework (threats, errors, UAS), and communication.

8%

Health, Fitness to Fly and SACAA Regulations

SA-CAR Part 91/61/67 regulations, Class 1 medical standards, IMSAFE checklist, alcohol BAC rules (0.02%), scuba diving, blood donation, and medication.

How to Pass the SACAA CPL Human Performance Exam

What You Need to Know

  • Passing score: 75%
  • Exam length: 30 questions
  • Time limit: 90 minutes
  • Exam fee: R450 per subject sitting under SACAA Part 187 user fees

Keys to Passing

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

SACAA CPL Human Performance Study Tips from Top Performers

1Memorise gas laws and their physiological applications: Boyle's law (GI gas expansion & barotrauma), Dalton's law (hypoxic hypoxia & partial pressures), Henry's law (decompression sickness), and Graham's law (gas diffusion in lungs).
2Know TUC values at key altitudes: FL180 (20–30 min), FL250 (3–5 min), FL300 (1–2 min), FL350 (30–60 sec), and FL450 (9–12 sec). Remember rapid decompression halves TUC.
3Distinguish vestibular illusions carefully: Coriolis (head move in turn), Somatogravic (linear acceleration feels like pitch up), The Leans (sub-threshold roll), and Graveyard Spiral.
4Master TEM taxonomy: categorise events correctly into Threats (external/internal inputs), Errors (crew action deviations), and Undesired Aircraft States (position/speed/configuration deviations).
5Drill SACAA regulatory limits: Class 1 medical validity (12 months / 6 months over 40/60 in single-pilot air transport), 8 hours bottle to throttle, 0.02% BAC limit, 12/24 hours post-scuba, and 72 hours post-blood donation.

Frequently Asked Questions

What is the format and duration of the SACAA CPL Human Performance exam?

The exam is a computer-based test (CBT) consisting of 30 multiple-choice questions with a time limit of 90 minutes. Candidates must achieve a score of 75% or higher to pass.

What is the fee for sitting the SACAA CPL Human Performance examination?

Under SACAA Part 187 user fees, the examination fee is R450 per subject sitting, payable to SACAA or the authorized examination centre.

What key physiological topics are examined at the CPL level?

Key physiological topics include gas laws (Boyle, Dalton, Henry, Graham), types of hypoxia and Time of Useful Consciousness (TUC), hyperventilation, decompression sickness, otic/sinus barotrauma, acceleration (+Gz/-Gz effects and G-LOC), carbon monoxide poisoning, and oxygen system operational thresholds.

How does Threat and Error Management (TEM) feature in the exam?

TEM is a major component of human factors for commercial pilots. You must understand threat classification (environmental vs organizational, anticipated vs unanticipated), error types (slips, lapses, mistakes, violations), and how managing errors prevents Undesired Aircraft States (UAS).

What are the SACAA Part 91 rules regarding alcohol, scuba diving, and blood donation?

Under SA-CAR Part 91.02.3, pilots must not fly within 8 hours of consuming alcohol or with a Blood Alcohol Concentration exceeding 0.02 g / 100 ml (0.02%). Following non-decompression scuba diving below 10 m, pilots must wait at least 12 hours before flying (24 hours after decompression stop or multiple dives). Blood donation requires a minimum 72-hour grounding period.