Plain English Meaning
The official written history of everything that has been done to the body of the airplane — every inspection, repair, and modification — kept in a dedicated book that stays with the aircraft.
Full Definition
Permanent maintenance records for the aircraft's airframe — the physical structure of the airplane excluding the engine, propeller, and certain other separately logged components. The airframe logbook documents inspections, repairs, alterations, airworthiness directive compliance, and the overall maintenance history of the structure throughout its service life.
Context Anchor
Seen during preflight assessment, aircraft checkout, rental checkout, purchase inspection, and any time a or verifies that required are .