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.
Plain English
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.
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.