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FS98 Takeoff Airspeed/Stall Advisory Gauge. This compact instrument allows takeoff airspeed (TOAS) to be entered. At 10 kts below TOAS, the first light comes on. At TOAS minus 5 kts the second light comes on. At rotation speed all three lights are on. All lights will turn off 10 kts above TOAS. When airborne, reset gauge to stall and lights will reverse the above pattern. By Glenn Copeland.