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2016 CBA Tentati ve Agreement Page 174 of 217 COMPLEXITY for PAY SETTING GLOSSARY Air Route Traffic Control Center (ARTCC) – An air traffic control facility that provides air traffic control service to aircraft opera ting on IFR flight plans within controlled airspace and principally during the en route phase of flight. When equipment capabilities and controller workload permit, certain advisory/assistance services may be provided to VFR aircraft. Air Traffic Operatio ns – all aircraft operations, excluding ground movement of aircraft, vehicles and personnel. Approach Control – An air traffic control terminal that provides radar and non - radar control to aircraft arriving or departing the primary airport and adjacent ai rports, and to aircraft transiting the terminal's airspace. Buffer zone – A numerical figure below the minimum facility complexity - formula - based pay level (breakpoint) for a particular facility's pay level. This figure will be used in conjunction with ai r traffic projections to determine if change to a lower pay level is appropriate. The buffer zones and the associated breakpoints are depicted in Appendix 1 of this Appendix. Center Airspace Mileage – For the purpose of this standard, the facility milea ge calculation is determined by the National Oceanic Survey (NOS) based on an average of the low altitude airspace square mileage and high altitude airspace square mileage. Center Area - The square mileage of the area defined by the geographic domestic bo undaries of the Center. Note: the calculation of this value is accomplished through coordination with Aeronautical Information Division, ATA - 100 and National Oceanic Survey. Class of Airspace – (Terminal use only) Airspace of defined dimensions within whi ch air traffic control service is provided to aircraft operations in accordance with the airspace classification. Class B, Class C and TRSA are used in the complexity formula. Class B Airspace – Generally, that airspace from the surface to 10,000 feet MSL surrounding busy airports in terms of airport operations or passenger enplanements. Class C Airspace – Generally, that airspace from the surface to 4,000 feet above the airport elevation (charted in MSL) surrounding those air ports that have an operational control tower, are serviced by a radar approach control, and have a certain number of IFR operations or passenger enplanements. Class D Airspace – Generally, that airspace from the surface to 2,500 feet above the airport el evation (charted in MSL) surrounding those airports that have an operational control tower. Combined Control Facility (CCF) – An air traffic control facility that provides approach control services for one (1) or more airports as well as en route air traf fic control (center control) for a large area of airspace. Some may provide tower services along with approach control and en route services. Domestic - Over - Water Traffic – To be counted as Domestic - Over - Water traffic the facility must: (1) separate aircra ft using ICAO rules (whether using radar or non - radar procedures), and (2) the aircraft must (or must have) crossed the ADIZ (whether in domestic - over - water sector or ocean sector).

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