Human performance limitations
Human performance is about recognising that the remote pilot is part of the safety system. Key concepts include situational awareness, workload, fatigue, stress, complacency, distraction, and decision making. Vision and hearing are limited: the drone is small, and you may misjudge distance, height, and closure rate. Spatial disorientation can occur when you rely on a screen rather than direct visual contact.
Use IMSAFE before flight: Illness, Medication, Stress, Alcohol, Fatigue, Emotion. Alcohol and drugs impair judgement and reaction time; some medications cause drowsiness or slow reactions even when you feel normal. Fatigue is a major cause of errors and is not cured by coffee or enthusiasm. Complacency is common with experienced pilots flying familiar sites: familiarity is not a barrier.
Traps: “I have flown this route many times, so it is safe”; believing that a short flight cannot be affected by fatigue; assuming a screen gives complete situational awareness; and ignoring the effect of cold, heat, noise, or glare. Communication with observers and bystanders must be clear and closed-loop.
Worked example: you finish a night shift and plan a short flight to test a new gimbal. IMSAFE shows Fatigue. Even though the flight is short, your reaction time and judgement are impaired, so you postpone. This is the correct decision, not an over-cautious one.