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AIRPORT MASTER PLAN <br />approaches exist to all other runway ends at the airport. There is also an NDB <br />approach to Runway 13. <br />All the RNAV/GPS approaches at the airport have three-quarter mile visibility <br />minimum with the exception of the RNAV/GPS approach for Runway 17 which has 1 <br />1/8-mile visibility minimums and the RNAV/GPS approach for Runway 31 which has <br />7/8-mile visibility minimums. Table 4-9 shows the IFR wind coverage for each <br />runway end at the San Marcos Regional Airport. <br />TABLE 4-9 <br />IFR WIND COVERAGE PER RUNWAY END <br />SAN MARCOS REGIONAL AIRPORT <br />RWY13 kts16 kts <br />17 65.84%66.19% <br />35 46.73%47.36% <br />13 68.09%69.37% <br />31 40.46%43.13% <br />8 63.06%66.32% <br />26 43.96%45.40% <br /> <br />Source: FAA Airports GIS Wind Analysis <br />Tool using HYI wind data as generated by <br />s GIS tool. Completed 5/3/19. <br />A key finding of this analysis is that Runway 17 is the runway end with the second <br />highest IFR wind coverage (second only to Runway 13 which has an ILS) but has the <br />worst visibility minimums of all the RNAV/GPS approaches for the airport. As a <br />result, a key priority for the alternatives process should be establishing lower <br />visibility minimums (3/4 mile) for the RNAV/GPS approach for Runway 17. Since <br />Runway 13 has the highest IFR wind coverage, the ILS approach and MALSR system <br />currently serving that runway should remain. <br />The current magnetic variation at San Marcos Regional Airport as shown on the FAA <br />O O <br />published airfield diagram is 4.2East with a 0.1 West annual change as of January <br />2015. The current, established magnetic heading for each runway is shown below: <br /> O O <br /> Runway 8/26 083.6 and 263.7 <br /> O O <br /> Runway 13/31 128.7 and 308.7 <br /> O O <br /> Runway 17/35 173.7 and 353.7 <br />Facility Requirements Chapter Page 12 of 70 <br />October 2020 <br /> <br />