Human Performance & Limitations (040) is the EASA ATPL(A) subject about the pilot: the body, the mind, and the limits of both. It explains why human factors cause most accidents and how to fly within your physiological and psychological envelope. The syllabus is built on three topics — human factors as a discipline, aviation physiology and health maintenance, and aviation psychology — and this guide walks through each in plain English, then sets out how to study for and pass the 040 exam at the 75% standard.
Of all 13 EASA ATPL theory subjects, Human Performance & Limitations is the one about you — the pilot. It examines the physical and mental limits that shape safe flying, because human error, not mechanical failure, is the dominant factor in modern aviation accidents.
The 040 syllabus is organised into three topics: the human-factors discipline itself, the basics of aviation physiology and health maintenance, and basic aviation psychology. The sections below break each one down into the sub-themes the ECQB actually tests. For how the exam is structured, sat and scored, see our ATPL exam-structure guide.
The foundation of the subject: what "human factors" means, why it matters in aviation, and what the accident record tells us. Roughly three out of four accidents involve human error rather than mechanical failure, which is exactly why EASA examines this subject as rigorously as the technical ones.
What human factors is
The study of how people interact with machines, procedures and each other in the cockpit — and how to design tasks, training and operations around human strengths and limitations rather than against them.
Why HPL matters
Human limitations (perception, memory, attention, fatigue, stress) are predictable. Understanding them lets you anticipate error, build defences, and recover — the core safety pay-off of the whole subject.
The accident record
Human error is a contributing factor in the large majority of aviation accidents. The discipline grew out of investigating those events and turning the lessons into training such as CRM.
The SHELL model
A standard framework for human factors: the Liveware (human) at the centre interfacing with Software (procedures), Hardware (the aircraft), Environment, and other Liveware (people). Mismatches at any interface create error.
How the body copes — or fails to cope — with the flight environment, and how to stay fit to fly. This is the largest topic and carries the highest density of exam questions: respiration and the effects of altitude, the senses and their illusions, the effects of acceleration, and the lifestyle factors behind a valid medical.
Atmosphere & respiration
The composition of the atmosphere, partial pressures, and how oxygen is transported in the blood. The basis for understanding what goes wrong with altitude.
Hypoxia
Oxygen starvation at altitude — its insidious onset, symptoms, time of useful consciousness, and why supplemental oxygen and cabin pressurisation matter. A perennial high-yield exam area.
Hyperventilation
Over-breathing (often stress-driven) that lowers blood CO2, producing symptoms that overlap with hypoxia. Knowing how to tell them apart and treat each is commonly tested.
Vision & hearing
How the eye and ear work, their limitations (night vision, the blind spot, empty-field myopia, noise-induced hearing loss) and the visual illusions that mislead pilots on approach.
Spatial disorientation
The vestibular system, its illusions (the leans, somatogravic and Coriolis illusions) and why trusting the instruments over your senses in IMC is non-negotiable.
G-effects & acceleration
The physiological effects of positive and negative G — grey-out, black-out, G-LOC — and the limits of human tolerance to acceleration.
Health, fitness & fatigue
Maintaining the medical: diet, alcohol and drugs, the effects of common ailments, circadian rhythm, sleep, fatigue management and the rules around flying after diving or donating blood.
The mind in the cockpit: how pilots take in information, where attention and workload break down, and how teams guard against error. This topic is where human factors becomes operational — situational awareness, decision-making, stress, and Crew Resource Management.
Information processing
The perception–decision–action loop, sensory and working memory, mental models, and how processing limits cause errors of perception and interpretation.
Attention & workload
Selective, divided and sustained attention; the danger of attentional tunnelling and distraction; and how high or low workload degrades performance.
Situational awareness
Building and keeping an accurate picture of the aircraft, environment and time. How SA is lost and the cues that warn you it is degrading.
Stress & arousal
Acute and chronic stress, the arousal–performance relationship (the Yerkes–Dodson curve), and coping strategies that keep performance inside the useful band.
Judgement & decision-making
Structured decision models, hazardous attitudes, risk assessment, and the cognitive biases (confirmation bias, plan continuation) that lead good pilots into bad decisions.
Human error & CRM
Error and violation models (Reason’s "Swiss cheese", the slip/lapse/mistake taxonomy) and Crew Resource Management — communication, leadership, teamwork and the use of all available resources to trap error.
Human Performance rewards understanding the links between topics and drilling the high-yield physiology until recall is automatic. A simple, repeatable plan:
Learn the three topics as a system, not a list
Human factors sets the frame, physiology explains the body, psychology explains the mind. Questions often cross topics (e.g. fatigue affecting attention), so study the links, not isolated facts.
Front-load the high-yield physiology
Hypoxia, hyperventilation, the visual and vestibular illusions and the effects of G recur heavily in the ECQB. Get fluent with these first — they are the densest source of marks.
Drill ECQB-style questions and review explanations
HPL is a recall- and recognition-heavy subject. Practising real-format multiple-choice questions and reading the reasoning behind each answer is the fastest route to the 75% standard.
Use spaced repetition for the definitions
Models, illusions and thresholds are memory-bound. Reviewing them on a spaced schedule (rather than cramming) is what makes them stick through to exam day.
Sit full mock exams at 75%
Rehearse under the real pass mark and time pressure so the exam itself holds no surprises, and so you can see which sub-themes still need work.
Important: Syllabus detail, medical standards and exam figures are set by EASA Part-FCL / Part-MED and applied by your national authority — always confirm the current requirements with your ATO/NAA, as they are periodically updated.
Human Performance is a recall-heavy subject built on definitions, models and thresholds — exactly what an all-in-one study platform is built to drill. ATPL Training pairs an ECQB-aligned question bank with structured LMS lessons, a spaced-repetition review engine that schedules the definitions for you, full mock exams at the real 75% pass mark, and an AI tutor that explains the reasoning behind every answer — all at around half the price of the incumbents.
Human Performance & Limitations, EASA subject code 040, is the ATPL(A) theory subject covering the pilot as a person — human factors, aviation physiology and health, and aviation psychology. It explains the physical and mental limits that affect safe flying and how to manage them.
The 040 syllabus has three topics: Human Factors: Basic Concepts (the discipline and the accident record); Basics of Aviation Physiology and Health Maintenance (respiration, hypoxia, hyperventilation, the senses and their illusions, spatial disorientation, G-effects, fitness and fatigue); and Basic Aviation Psychology (information processing, attention and workload, situational awareness, stress, decision-making, human error and CRM).
Human error is a contributing factor in the large majority of aviation accidents. Studying human factors lets pilots anticipate the predictable limits of perception, memory, attention, fatigue and stress, build defences against error, and work as a crew to trap mistakes before they become accidents.
Hypoxia is a lack of oxygen reaching the body’s tissues, typically caused by altitude; it has an insidious onset and is countered with supplemental oxygen and pressurisation. Hyperventilation is over-breathing that lowers blood CO2, often triggered by stress. Their symptoms overlap, so pilots are taught to treat for hypoxia first (use oxygen) and then control the breathing rate.
Like every EASA ATPL(A) theory subject, Human Performance & Limitations (040) is passed at a minimum of 75%, with each subject passed independently. The exact exam format and figures are set by EASA Part-FCL and applied by your national authority, so confirm the current details with your ATO/NAA.
Study the three topics as a connected system, front-load the high-yield physiology (hypoxia, hyperventilation, the visual and vestibular illusions, G-effects), drill ECQB-style questions while reading the explanations, use spaced repetition for the definitions and models, and rehearse with full mock exams at the real 75% pass mark.
Drill ECQB-aligned 040 questions, lock in the definitions with spaced repetition, and rehearse with full mock exams at the real 75% pass mark.
