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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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/94/US_Air_Force_060122-F-4081S-061_Flight_preparation.jpg/250px-US_Air_Force_060122-F-4081S-061_Flight_preparation.jpg)
The pilot primarily inspects outside parts of the aircraft they will steer, e.g. control surfaces, tires and possible leaks from fuel or oil.