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AIRPORT MASTER PLAN <br /> <br />A IRCRAFT O PERATIONS F LEET M IX F ORECAST <br />In addition to forecasting the total number of annual operations projected to occur <br />at an airport during the forecast period, it is also critical to project the types of <br />aircraft that will likely be operating at the airport. <br />An examination of historic Instrument Flight Rules (IFR) aircraft operations data at <br />the San Marcos Regional Airport provides some guidance towards developing an <br />accurate fleet mix forecast. Historic IFR flight data for an airport can be pulled from <br />ystem Counts (TFMSC) database. While IFR <br />flightrecords account for only a fraction of the total operations that occur at an <br />airport, they do provide an indicator of the type of aircraft that use the airfield and <br />the frequency. It can also be assumed that most aircraft not operating under IFR <br />flight rules at the airport are smaller single engine and light-twin engine aircraft that <br />typically fall in the A-I and B-I aircraft classifications. <br />IFR flight data from 2013 through 2018 was used to analyze the current mix of <br />aircraft using the San Marcos Regional Airport. Based on this data, discussions with <br />ing <br />aircraft operations fleet mix ratios were established for forecasting purposes: <br /> Single Engine Piston Aircraft 79.75% <br /> Multi Engine Piston Aircraft 8% <br /> Turbo-Prop Aircraft 7% <br /> Jet 5% <br /> Helicopter .25% <br />For the purposes of these calculations, light sport aircraft and experimental aircraft <br />have been included in the single-engine piston aircraft category. These ratios are <br />expected to change during the forecast period based on national trends and <br />expected changes in the -based aircraft fleet mix. Consequently, <br />lied progressively to these <br />baseline ratios during each forecast interval. Acceleration factors were applied to <br />jet, turboprop, and helicopter aircraft. A deceleration factor was applied to single <br />engine piston aircraft. <br /> <br />Activity Forecasts Chapter Page 27 of 36 <br />October 2020 <br /> <br />