Clearance Indicated Airspeed True Airspeed 
Air Facts
MAY 10, 2024
Particular attention to true airspeed vs. turn radius. If you depart MDA on the downwind or base leg, you’re on your own as far as obstacle clearance. What specific indicated airspeed will be flown/adhered to during the circling maneuver? Be fully configured and on speed prior to receiving landing clearance.
Pilot Institute
MARCH 26, 2025
For example, if we were to takeoff on an airfield at sea level at 0C (32F), it would take 1520ft to reach our obstacle clearance height of 50ft. Whereas for the same airfield on a different day, if it were 30C (86F), that same obstacle clearance height would take 1880ft. That’s an extra 360ft!
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