Human Factors EASA Part-66 — Module 9 Practice Questions

What Module 9 covers — in plain English

Module 9 of the EASA Part-66 syllabus covers Human Factors — the study of how people perform, communicate, make errors and recover from them in the aircraft maintenance environment. It is the only Part-66 module that every licence category sits to the same standard at knowledge level 2, and it is widely seen as one of the more deceptive papers: the questions are written in plain English about everyday concepts (fatigue, stress, memory, communication, teamwork), which tempts candidates to answer from common sense or workshop folklore rather than from the specific doctrine the syllabus lays out. The module grew out of the post-Aloha-243 industry response in the late 1980s, when regulators recognised that the majority of maintenance-related incidents trace back to human factors rather than to component or design failure, and it has been a mandatory part of the Part-66 syllabus ever since.

The bank covers ten sub-sections, from the general case for human factors and Murphy’s law (9.1) through human performance and limitations — vision, hearing, memory, attention (9.2), social psychology and team working (9.3), factors affecting performance such as sleep, stress, alcohol and shift work (9.4), the physical environment of noise, illumination and temperature (9.5), task types including visual inspection and complex systems (9.6), communication and shift handover (9.7), error models and the types of error seen in maintenance tasks (9.8), safety management, occurrence reporting and just culture (9.9), and the Dirty Dozen of common maintenance errors with their associated risk-mitigation strategies (9.10). Expect questions that hinge on a single doctrinal distinction — slip vs lapse vs mistake, just culture vs no-blame culture, peer pressure vs supervisory pressure, or SHEL vs SHELL — rather than on numbers or formulas. Reading the actual question wording slowly matters more here than in almost any other Part-66 module.

All five licence categories (A, B1, B2, B2L and B3) sit the same 28-question, 35-minute paper at knowledge level 2 across every sub-section — you need to understand the principles and be able to apply them in context, not just recognise the vocabulary. The pass mark is 75 %, leaving room for only seven incorrect answers out of twenty-eight, and the questions are split fairly evenly across the ten sub-sections rather than concentrated in any one area. The full per-section breakdown, including links to relevant CAA and FAA reference material, is on our Module 9 syllabus page.

These samples are drawn from our live Module 9 question bank of 746 questions. The full timed practice quiz draws 28 questions per attempt (or 28 for Cat A), scored against the official EASA 75 % pass mark, with weak-area tracking across attempts.