Walk-around
In aviation, an outside check or walk around is the air crew inspecting certain elements of an aircraft prior to boarding for security, safety, and operational reasons.

Pre-flight inspection of an F-15 Eagle.
The pilot primarily inspects outside parts of the aircraft he will steer, e.g. control surfaces, tires and possible leaks from fuel or oil.
See also
- Preflight Planning Dispatch Checklist
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