Online Ground School (Private Pilot)
Lesson 15.8: Aircraft airspeeds
Below 10,000 ft 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).
Pilots/aircraft are NOT authorized to fly at 250kts Indicated Airspeed (IAS) below 10,000 ft MSL.