Atlas/ Glossary/ ALS Abbreviation ALS — approach light system. ALS approach light system. Source 14 CFR § 1.2 → Related — Abbreviation. ABEAM ABEAM ABORT ABORT — To terminate a preplanned aircraft maneuver AFM AFM — airplane flight manual AGL AGL — above ground level APU APU — auxiliary power unit ASR ASR — airport surveillance radar
