Definition
A systematic evaluation conducted before flight to determine whether the aircraft is in a safe and airworthy condition for the intended operation. It includes reviewing required documents, checking maintenance status, and performing a thorough visual and functional inspection of the aircraft and its systems in accordance with the manufacturer's checklist.
Plain English
A careful check of the aircraft before flying it to make sure everything is in good working order and legal to fly. The pilot looks over paperwork, the airframe, the engine, fuel, oil, and key systems before getting in to start up.
Context Anchor
Used at the start of a flight, before engine start, when the pilot reviews the aircraft, its records, and its condition using the checklist and other required information.
Derivation
Pre-' means before, and 'flight' is self-explanatory. 'Assessment' comes from the Latin 'assidere', meaning to sit beside -- originally to sit beside someone to help judge a matter. The word carries the sense of careful judgment, not just a quick look. That distinction matters here: a preflight assessment is an evaluation, not a glance.
Why Pilots Care
Identifies discrepancies that could lead to mechanical failure, loss of control, or regulatory violations before they become airborne problems.
Intuition Check
Do not treat preflight assessment as only the outside walkaround. It is the full before-flight decision about whether this aircraft should be flown for this flight.
Example Sentence 1
Before each flight, the pilot completes a preflight assessment using the manufacturer's checklist to confirm the aircraft is airworthy.
Example Sentence 2
During the preflight assessment the pilot found a small crack in the propeller that required maintenance before flight.