In audio electronics a "ground loop" exists when different parts of the circuitry, say preamp and power amp, are separately grounded, creating a loop. This means that the signal reference ground may be different in the two places, and the usual result is hum.
For airplanes, a "ground loop" is a maneuver you do if you are about to run off the end of a runway. Basically you tip the plane so that one wingtip touches the ground. This makes the plane spin around and come to a stop quickly, usually with minimal damage, like a scuffed-up wingtip.
For airplanes, a "ground loop" is a maneuver you do if you are about to run off the end of a runway. Basically you tip the plane so that one wingtip touches the ground. This makes the plane spin around and come to a stop quickly, usually with minimal damage, like a scuffed-up wingtip.