Definition
The official written records that document the maintenance history, inspections, repairs, modifications, and operational time of an aircraft and its major components. Aircraft logbooks typically include separate records for the airframe, each engine, and each propeller, and serve as the legal proof that the aircraft has been maintained in accordance with applicable regulations.
Plain English
The aircraft's official record books. They show what work has been done on the aircraft, when it was inspected, and how many hours it has flown.
Context Anchor
You will see aircraft logbooks during pre-purchase checks, maintenance discussions, flight school aircraft checkout, and any review of whether an airplane is legal to fly.
Derivation
The word 'logbook' comes from old shipping practice, where a 'log' was a wooden float used to measure a ship's speed. Sailors recorded those readings, plus weather and events, in a book — the 'logbook.' Aviation kept the same idea: an ongoing written record of an aircraft's life and condition.
Why Pilots Care
They prove the aircraft is airworthy, satisfy legal requirements, and directly affect safety, insurance, and resale value.
Intuition Check
Do not confuse aircraft logbooks with your personal pilot logbook. Aircraft logbooks belong to the airplane and record its condition and maintenance history; a pilot logbook records a pilot’s flight experience.
Example Sentence 1
Before signing the rental agreement, the pilot reviewed the aircraft logbooks to confirm the annual inspection was current.
Example Sentence 2
Before purchasing the plane, the buyer spent hours reviewing the aircraft logbooks for any gaps in maintenance history.