ATS AIRSPACE CLASSIFICATION AND DESCRIPTION AIRSPACE CLASSIFICATION (see ENR 6.13)ENR 1.4-4)ATS airspace is designated in accordance with the following airspace classification:Class A: flights only are permitted. All flights are provided with air traffic control service and are separated from each other. Continuous air-ground voice communications are required for all flights. All flights are subject to clearance.Class B: IFR and flights are permitted. All flights are provided with air traffic control service and are separated from each other. Continuous air-ground voice communications are required for all flights. All flights are subject to ATC clearance.Class C: IFR and VFR flights are permitted. All flights are provided with air traffic control service and IFR flights are separated from other IFR flights and from VFR flights. VFR flights are separated from IFR flights and receive traffic information in respect of other VFR flights and traffic avoidance advice on request. Continuous air-ground voice communications are required for all flights and a speed limitation of 250 KT applies to all flights below FL 100. All flights are subject to ATC clearance.Class D: IFR and VFR flights are permitted and all flights are provided with air traffic control service. IFR flights are separated from other IFR flights, receive traffic information in respect of VFR flights and traffic avoidance advice on request. VFR flights receive traffic information in respect of all other flights and traffic avoidance advice on request. Continuous air-ground voice communications are required for all flights. Speed limitation of 250 KT IAS applies to VFR flights below FL 100. All flights are subject to ATC clearance.Class E: IFR and VFR flights are permitted. IFR flights are provided with air traffic control service and are separated from other IFR flights. All flights receive traffic information as far as is practical. Continuous air-ground voice communications are required for IFR flights. A speed limitation of 250 KT IAS applies to all flights below FL 100. All IFR flights are subject to ATC clearance.Class F: IFR and VFR flights are permitted. All participating IFR flights receive an air traffic advisory service and all flights receive flight information service if requested. Continuous air-ground voice communications are required for IFR flights participating in the advisory service and all IFR flights shall be capable of establishing air-ground voice communication. A speed limitation of 250 KT IAS applies to all flights below FL 100. ATC clearance is not required.Class G: IFR and VFR flights are permitted and receive flight information service if requested. All IFR flights shall be capable of establishing air-ground voice communication. A speed limitation of 250 KT IAS applies to all flights below FL 100. ATC clearance is not required.Vilnius FIR uncontrolled airspace is assigned to Radio mandatory zone (RMZ), in which requirements of SERA.6005 a) of Commission Implementing Regulation (EU) No 923/2012 are applied.ATS AIRSPACE DESCRIPTIONClassType of flightSeparation providedService providedSpeed limitationRadio communication capability requirementContinuous two-way air-ground voice communication requiredSubject to an ATC clearanceA1)IFR onlyAll aircraftAir traffic control serviceNot applicableYesYesYesB1)IFRAll aircraftAir traffic control serviceNot applicableYesYesYesVFRAll aircraftAir traffic control serviceNot applicableYesYesYesCIFRIFR from IFRIFR from VFRAir traffic control serviceNot applicableYesYesYesVFRVFR from IFR1) Air traffic control service for separation from IFR; 2) VFR/VFR traffic information (and, traffic avoidance advice on request)250 KT2) IAS below FL100YesYesYesDIFRIFR from IFR Air traffic control service, traffic information about VFR flights (and traffic avoidance advice on request)250 KT2) IAS below FL100YesYesYesVFRNILIFR/VFR and VFR/VFR traffic information (and traffic avoidance advice on request)250 KT2) IAS below FL100YesYesYesE1)IFRIFR from IFRAir traffic control service and, as far as practical, traffic information about VFR flights250 KT IAS below FL100YesYesYesVFRNILTraffic information as far as practical250 KT IAS below FL100NoNoNoF1)IFRIFR from IFR as far as practicalAir traffic advisory service; on request flight information service250 KT IAS below FL100YesNoNoVFR NILFlight information service on request250 KT IAS below FL100No3)No3)NoGIFR NILFlight information service on request250 KT2) IAS below FL100Yes3)No3)NoVFR NILFlight information service on request250 KT2) IAS below FL100Yes3)No3)NoClasses A, B, E and F are not used in Vilnius .A speed limitation of 250 KT IAS below FL 100, as specified in SERA.6001 of Commission Implementing Regulation (EU) No 923/2012, is not applied to NATO state aircraft conducting airspace surveillance, control and defense functions as well as the related training flights. This exemption is not applied to military aircraft operating on ATS routes, where IAS speed limit is established depending on the aircraft category.In RMZ pilots shall maintain continuous air-ground voice communication watch and establish two-way communication on the appropriate communication channel.ATS Airspace Classification