low-altitude alert system
low-altitude alert system (LAAS)
An automated function of ground radar that alerts the controller when a mode C transponder-equipped aircraft on an IFR (instrument flight rules) plan is below a predetermined safe altitude. If requested by the pilot, LAAS is also available in VFR (visual flight rules) mode C transponder-equipped aircraft. LAAS is also an acronym for local area augmentation system.
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