Definition
The official maintenance records for an aircraft, consisting of separate books for the airframe, each engine, and each propeller. They contain the dated entries made by mechanics and inspectors that document inspections, repairs, alterations, airworthiness directive compliance, and the current status of required inspections.
Plain English
The written history of the aircraft. Every time work is done on the airframe, engine, or propeller, a mechanic signs an entry in these books. The pilot reviews them before flight to confirm the aircraft is legal and safe to fly.
Context Anchor
A pilot encounters logbooks during preflight assessment, especially when confirming that required inspections and maintenance signoffs are current before accepting an aircraft for flight.
Derivation
Originally a 'log' was the wooden float thrown overboard on a ship to measure speed, and the 'log book' was where those readings were recorded. The word carried over to aviation to mean the official running record of the aircraft itself.
Why Pilots Care
A pilot must confirm through the logbooks that the aircraft is legally airworthy and all required maintenance has been completed; flying without this verification can violate regulations and compromise safety.
Intuition Check
Do not think of logbooks as a casual notebook or diary. In this FAA context, logbooks are official aircraft records used to verify the airplane’s maintenance and inspection status.
Example Sentence 1
Before her first flight in the rental, she reviewed the airframe and engine logbooks to confirm the annual inspection was still current.
Example Sentence 2
After the oil change, the mechanic recorded the work and tachometer reading in the engine logbook.