Showing content mapped to EASA Part-66. Change authority in the header.
The Dirty Dozen
Twelve common precursors to maintenance error introduced by Gordon Dupont: Lack of communication, Complacency, Lack of knowledge, Distraction, Lack of teamwork, Fatigue, Lack of resources, Pressure, Lack of assertiveness, Stress, Lack of awareness, Norms.
SHEL model
A conceptual framework describing interaction between Software (procedures), Hardware (tools/equipment), Environment and Liveware (people). Errors often arise at the interface between the human and one of the other components.
Error types
Slips (correct plan, wrong action), lapses (memory failures — forgetting a step), mistakes (wrong plan) and violations (deliberate deviation from procedure). Effective error management targets the system, not just the individual.
Fatigue & shift work
Circadian rhythm dips around 03:00 and 15:00 — highest error risk. Sleep debt cannot be caught up on a single night. Employers should limit consecutive night shifts and provide fatigue-management training.