Definition
A handheld tool that uses compressed air to atomize a liquid finish (such as paint, primer, or dope) and propel it onto a surface in a controlled fan-shaped pattern. The gun draws or feeds liquid from an attached cup or pressure pot, mixes it with air at an adjustable nozzle, and breaks it into fine droplets that produce a smooth, even coating.
Plain English
A tool that turns liquid paint into a fine mist using air pressure, so it can be sprayed evenly onto a surface instead of brushed on.
Context Anchor
Seen in aircraft maintenance and repair work, especially during painting, priming, fabric covering, and corrosion-control jobs.
Derivation
“Spray” means liquid scattered in small drops. “Gun” here means a hand-held tool with a trigger, not a weapon. Together, the term points to a trigger-controlled tool that sends liquid onto a surface as a fine mist.
Why Pilots Care
Correct use ensures uniform coverage that protects against corrosion, which is essential for structural integrity and airworthiness.
Intuition Check
Do not read “gun” as a weapon here. In this maintenance use, a spray gun is a trigger-operated tool for applying liquid coatings.
Example Sentence 1
The mechanic adjusted the spray gun to produce a finer mist before applying the topcoat to the wing.
Example Sentence 2
After mixing the paint, the mechanic tested the spray gun on a scrap panel before coating the fuselage.