Part-66 Module 9 study guide
Part-66 Module 9 · Work through your exam, one topic at a time.
Module 9 - Human Factors is one of the knowledge modules in the EASA Part-66 aircraft maintenance licence syllabus. Part-66 forms Annex III to Commission Regulation (EU) No 1321/2014 on continuing airworthiness, the regulation that sets out requirements for the approval of organisations and personnel involved in maintenance. The Part-66 Module 9 study guide has 9 sections and about 2,570 words.
01General - Why Human Factors Matters in Maintenance
Aircraft are designed and built well, but they are maintained, inspected and certified by people. Analyses of aviation accidents and incidents consistently show that the majority involve human rather than purely technical failure, and maintenance and inspection errors form a significant share of that.
318 words, about 2 min02Human Performance and Limitations
Acuity is highest at the fovea, while peripheral vision detects movement and dim light. Night vision uses the rods, needs roughly 30 minutes of dark adaptation, and is destroyed by a brief bright light.
287 words, about 1 min03Social Psychology
Every technician carries personal responsibility for airworthiness, but that responsibility is exercised among other people. Management pressure (delivery deadlines, cost), peer pressure (everyone signs it off like that) and personal ambition can all push a person toward cutting corners.
286 words, about 1 min04Factors Affecting Performance
Illness, injury, pain and both prescribed and over-the-counter medication all degrade performance; many common cold and allergy remedies cause drowsiness. Alcohol effects outlast the blood alcohol level: hangover reduces attention and judgement.
276 words, about 1 min05Physical Environment
Noise causes permanent hearing damage, interferes with speech and warning signals, and adds to fatigue and irritation. Hearing loss from noise is irreversible, so prevention is the only protection.
280 words, about 1 min06Tasks
Physical work involves lifting, manual handling and ergonomics - poor posture and excessive load cause injury and reduce precision. Repetitive and vigilance tasks are deceptive: inspection is never perfectly reliable, and even trained inspectors miss defects, especially rare ones, with performance declining over long sessions.
275 words, about 1 min07Communication
A sender encodes a message, chooses a medium, and the receiver decodes it; feedback confirms that the intended meaning arrived. Noise - literal or figurative - can distort any stage.
244 words, about 1 min08Human Error
An error is an unintentional deviation from intention or from the required standard. A violation is a deliberate deviation from a rule or procedure, made knowingly.
292 words, about 1 min09Hazards in the Workplace
Electrical : shock, arc flash and stored energy in capacitors; isolate, lock off, prove dead, and remove rings and metal watch straps. Gas and oxygen : oxygen enrichment makes materials burn fiercely, and oil or grease on oxygen fittings is a fire risk.
312 words, about 2 min