Maintenance Practices and Human Factors
What you must understand
Maintenance practice covers documentation and control: the task card, the work package, the certification of work, the maintenance release, and the handling of deferred defects and concessions. Know the rules for recording work - who signs, when, and what must be entered - and the meaning of a duplicate inspection and a critical task. Understand torque procedures, lockwiring, safetying, and the control of tools and parts (robbing, quarantine stores, serviceable labels).
Human factors is examined as a system, not as personality. Understand the SHELL model and the dirty dozen: fatigue, complacency, distraction, lack of communication, lack of resources, pressure, lack of assertiveness, stress, lack of awareness, norms, lack of teamwork and lack of knowledge. Know the meaning of a violation versus an error, and the distinction between active and latent failures. Understand the reason for a shift handover, the two-person rule, and how a "normalised deviation" becomes accepted practice.
Traps
Questions often ask which factor is most likely to cause an error in a described scenario. Read for pressure and fatigue first. Another trap is confusing a duplicate inspection (two independent inspections of a critical assembly) with a second pair of eyes on a routine task.
Rule of thumb
When a scenario describes an experienced technician skipping a step because "it has always been fine", the answer is normally a violation driven by normalised practice, not a knowledge error.