Airspace Classes
Airspace differentiation by class is another way that pilot-ATC interractions are regulated. As evident by the title airspace class is not dependent on the pilots’ or controllers’ actions, but on the airspace in which a pilot is flying and which ATC is or is not controlling.
Airspace classes are identified by letters A through G. They are spoken on frequency using the international phonetic alphabet. Below is a table explaining the differences between airspace classes.
| Class | Type | Separation Requirements | Availability to VFR Traffic | Two-way Radio Communications |
|---|---|---|---|---|
| A | Controlled | All traffic | ❌ No | All traffic |
| B | Controlled | All traffic | ⚠️ Subject to clearance | All traffic |
| C | Controlled | IFR from IFR IFR from VFR VFR from IFR | ⚠️ Subject to clearance | All traffic |
| D | Controlled | IFR from IFR | ⚠️ Subject to clearance | All traffic |
| E | Controlled | IFR from IFR | ✅ Yes | IFR traffic |
| F | Uncontrolled | IFR from IFR as far as practical | ✅ Yes | IFR traffic |
| G | Uncontrolled | NIL | ✅ Yes | IFR traffic |
Nearly all controlled airspace in EVRR FIR is class C with a little exception of Lielvārde CTR, which is class D. All uncontrolled airspace in EVRR FIR is class G.