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FACILITY REQUIREMENTS TABLE 3-1 AIRCRAFT FLEET MIX Percentage of Total Aircraft Fleet Mix Commercial Service Aircraft26% Single Engine44% Twin Engine9% GA Jets 21% Source: RS&H Data Collection and Analysis, 2016 Hourly Throughput Capacity Hourly throughput capacity is an important element in understanding how an airport can accommodate aircraft with or without a certain amount of delay during daily operations. Meteorological conditions have considerable influence on airfield capacity each day. Airfield capacity is at its highest during visual meteorological conditions (VMC) when visibility is greater than 3 miles and cloud ceilings are above 1,000 feet. In these conditions, aircraft are able to fly closer to one another allowing more aircraft to land within a single hour. When weather is below specific visibility and cloud clearance minimums, aircraft must fly farther apart and have more restricted flight operations to ensure safety. When aircraft are further apart, fewer landings can occur within a single hour. Eugene Airport has two parallel runways, with Runway 16R-34L acting as the primary runway. Understanding available FAA flight procedures and knowing how ATC operates the airfield is another important factor for determining the airfield capacity. For the purpose of this analysis, it was assumed that aircraft at or exceeding 12,500 pounds were prioritized to land and depart from the main runway (Runway 16R) and aircraft less than 12,500 pounds were given the ability to land and depart from either runway (16R or 16L) so long as it did not impede large aircraft operations on the main runway. This matches the typical operational procedures of ATC at Eugene Airport. Figure 3-2, Table 3-2, and Table 3-3 show the hourly throughput capacity during both visual and instrument meteorological conditions for Eugene Airport. Hourly throughput capacity during VMC is optimized for arrival and departure operations through the use of both runways, achieving 68 arrivals and 68 departures per hour, totaling 136 operations per hour. Operational throughput is reduced during IMC conditions to 48 arrivals and 48 departures per hour, totaling 96 operations per hour. As the proportion of arrival and departure percentages fluctuates, arrival/departure trade-offs are made for the capacity of each type of operation, as shown in the following figure and tables. Discussions with Air Traffic Control indicated that peak hour operations only average approximately 10 arriving or departing aircraft, supporting the conclusion of this analysis that, under present circumstances, hourly capacity is not an issue. EUGENE AIRPORT MASTER PLAN 3-5