Atlas / Learn / Glossary CHOP — - A form of turbulence CHOP · Abbreviation - A form of turbulence. Source: FAA Pilot/Controller Glossary Related · Abbreviation ABEAM ABEAM ABORT ABORT — To terminate a preplanned aircraft maneuver AFM AFM — airplane flight manual AGL AGL — above ground level ALS ALS — approach light system APU APU — auxiliary power unit
