Aircraft Airspeeds
Below 10,000 feet measured sea level (MSL):
Within certain airspace's, VFR corridors and or underneath certain airspace. Aircraft are restricted to curtain airspeed's, unless authorized by Air Traffic Control (ATC).
Aircraft are not authorized to fly at 250 knots (kts) Indicated Airspeed (IAS) below 10,000 feet MSL.
Class B airspace:
Underlying Class B airspace or within a VFR corridor, the speed is no more than 200kts IAS.
Class C and D airspace:
At or below 2,500 feet above the surface and within 4 NM of a Class C and D airports, the speed is no more than 200kts IAS.
References:
Airspace - Study Guide
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