Definition
A systematic walk-around examination of the airplane conducted before flight to confirm the aircraft is airworthy and ready for the intended operation. It is performed by visually checking the exterior, control surfaces, landing gear, powerplant, fuel and oil quantities, and other items specified in the airplane's approved checklist or pilot's operating handbook.
Plain English
A careful look-over of the airplane on the ground before flying, where the pilot checks each part of the aircraft against a checklist to make sure nothing is broken, missing, or out of place.
Context Anchor
You encounter this before every flight, usually during the walkaround outside the aircraft and the checks made before engine start.
Derivation
Pre- means 'before,' and flight means the act of flying. So 'preflight' simply means 'before the flight.' A 'visual inspection' is an examination done by looking. Together: a look-over done before the flight.
Why Pilots Care
Detects issues that could lead to in-flight failures or accidents, directly supporting the pilot's responsibility for airworthiness.
Grounding Statement
This is the pilot’s last close look at the airplane before trusting it in the air.
Intuition Check
Do not read “visual” as “quick glance.” Here it means a careful, purposeful look for visible problems before flight.
Example Sentence 1
Before her training flight, the student completed the preflight visual inspection using the checklist in the pilot's operating handbook.
Example Sentence 2
During the preflight visual inspection the instructor pointed out a loose fuel cap that had been missed on the first pass.