Plain English Meaning
A groove or trench cut into a metal surface where something sharp has dragged across it and scooped material out. It is deeper and more damaging than a scratch.
Full Definition
A surface defect in metal, typically caused by a sharp object dragging across the material, that removes a noticeable amount of metal and leaves a groove with displaced or rolled-up edges. A gouge is more severe than a scratch because it removes material rather than simply marking the surface.
Context Anchor
Seen during preflight inspections, maintenance inspections, and damage reports for parts such as propeller blades, metal skin, fairings, and other aircraft surfaces.
Derivation
From Old French 'gouge,' meaning a chisel with a curved blade used for scooping out wood. The aviation usage keeps the same idea: material has been scooped out of the surface.
Why Pilots Care
A gouge can be a stress raiser, meaning cracks can start and spread from the damaged area. Maintenance manuals specify allowable depths and locations for gouges; anything beyond those limits requires repair or part replacement before flight.
Intuition Check
Do not read gouge here as unofficial test information or pilot slang. In this maintenance context, a gouge is physical damage to an aircraft surface.
Example Sentence 1
During preflight, the pilot found a deep gouge on the leading edge of the propeller and called maintenance before the next flight.
Example Sentence 2
Sharing the gouge from her recent ride helped the next pilot focus study time on the right areas.