Airspace classes

Airspace classes are types of airspace which tell pilots...

• If they are allowed to enter it and under which circumstances (depending on visibility, aircraft type and flight rule)
• If they need to file a flight plan before entry, request clearance, report, or just do nothing

These classes are limited laterally (they have borders to neighbouring airspaces) and vertically (they are sliced in flight levels).

ICAO airspaces have letters ranging from A thru E.

Austrian Airspace uses the following classifications ((c) Austrocontrol):

Airspace C

... is the highest used in Austria (We don't use B and A - it's only used in extremely busy terminal areas where VFR flights are completely banned). C means...

• ATC service is provided ( = a controller is there who gives orders) to separate IFR from IFR and IFR from VFR (No separation VFR/VFR!)
• FIS service is provided (Flight Information Service = a controller who gives information)
• Alert service is provided in case airplanes get too close to each other.
• Two-way radio contact is mandatory.
• Pilots need to request permission and clearance by ATC.

Airspace D

... is the