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sim/
sim/cockpit2/
sim/cockpit2/gauges/
sim/cockpit2/gauges/indicators/
sim/cockpit2/gauges/indicators/max_mach_number_or_speed_kias
float
in knots
For planes with a max mach number, this is the lesser of the max mach number converted to KIAS for the current plane altitude and V-never-exceed.