Rules of the Air, Airspace Classification and ATS
What this domain tests
This domain examines the operational rules that keep aircraft separated: airspace classes A to G, visual and instrument meteorological conditions, clearances, flight plans, position reporting, SSR and ATS responsibilities. You must know what changes when airspace changes, especially the difference between controlled and uncontrolled airspace and between VFR and IFR.
Core concepts
- Class A: IFR only; all aircraft separated.
- Class C: IFR and VFR; clearance required; IFR separated from IFR and VFR; VFR separated from IFR.
- Class D: IFR and VFR; clearance required; IFR separated from IFR; traffic information given to VFR.
- Class G: uncontrolled; no ATS clearance; see-and-avoid and applicable VMC/IMC rules apply.
- VFR requires visual meteorological conditions and, in controlled airspace, an ATC clearance.
- Position reports, SSR codes and flight plans are required where the rules or ATS direct.
Worked example
A VFR flight plans to cross Class C airspace in visual conditions. The pilot must obtain an ATC clearance before entering, maintain the prescribed VMC minima and follow any route or level instructions. Being VFR does not remove the clearance requirement. If the clearance is refused, the pilot remains outside the class C airspace or amends the route.
Traps that cost marks
Treating Class D like Class C for VFR separation; entering controlled airspace without a clearance because visibility is good; confusing VMC minima with a clearance; and assuming Class G has an ATS separation service.