Is Human Performance & Limitations (040) Hard? And Can You Memorise It?

Physiology of flight, hypoxia, hyperventilation, spatial disorientation, vision, stress, fatigue, decision making and crew resource management.

Half medical science, half psychology — with a defined syllabus vocabulary of its own.

For the full topic-by-topic syllabus breakdown, see the Human Performance & Limitations subject guide.

Any single number here would be false precision, so we won’t give one. As a rough planning figure, most self-study candidates allocate 40–80 hours per subject, and students report Human Performance & Limitations typically sitting toward the lower end of that range. A moderate exam with intuitive content for most candidates — typically toward the lower end of the per-subject budget.

Your own figure depends on background, maths comfort and whether you are studying full-time — treat the range as a budget to adjust, not a target to hit.

The physiology has hard facts to memorise (values, thresholds, symptoms), and the exam expects the syllabus’s specific terminology, not your paraphrase of it. The CRM and psychology material, by contrast, is tested through scenario questions where understanding the principle beats recalling a phrase.

Not part of our seeded affinity groups — a good flexible subject to balance a sitting that already contains a heavyweight like AGK or Meteorology.

How the pairings fit into a full plan — and why order matters — is covered in the recommended order of study, with the sitting mechanics in sittings & limits.