Plain English Meaning
Surprise is what happens when something unexpected occurs in flight and your brain has to stop and figure out what just changed. It is the mental jolt of "that wasn't supposed to happen" before you can decide what to do.
Full Definition
In aviation human factors, surprise is the cognitive reaction that occurs when a pilot encounters an event that does not match their mental model of the situation. It is primarily a thinking response — the brain pauses to reconcile what just happened with what was expected — and it can degrade decision-making and performance until the pilot updates their understanding of what is going on.
Context Anchor
Seen in training on unexpected events, abnormal aircraft behavior, unusual readings, and the surprise and .