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AIRPORT MASTER PLAN <br />standard format and can be received within 25nautical miles ofthe automated <br />weather site. <br />At airports with instrument procedures, an AWOS/ASOS weather report eliminates <br />the remote altimeter setting penalty, thereby permitting lower minimum descent <br />altitudes (lower approach minimums). These systems should be sited within 500 to <br />1,000 feet of the primary runway centerline. FAA Order 6560.20B, Siting Criteria for <br />Automated Weather Observing Systems, assists in the site planning for AWOS/ASOS <br />systems. <br />The San Marcos Regional Airport is equipped with an AWOS-3 system that is owned <br />and operated by the FAA. The AWOS is in good condition. <br />airport. There are a number of different categories/types of airspace that must be <br />considered as part of the Airport master planning process. These include: <br /> Airspace Classification for Aeronautical Operators (e.g. Class B, C, D, etc.) <br /> FAR Part 77 Imaginary Surfaces <br />Airspace Classification for Aeronautical Operators <br />The current airspace surrounding the San Marcos Regional Airport is classified as <br />Class D airspace during times when the ATCT facility at the airport is operational (7 <br />AM to 7 PM). When the ATCT facility is not in operation, the airspace around the <br />airport reverts to Class E airspace. <br />As aircraft operations levels are not expected to change significantly during the <br />forecast period, it is not expected that the current airspace classification will need <br />to be changed during the 20-year planning horizon. <br />FAR Part 77 Imaginary Surfaces <br />14 CFR Part 77, Safe, Efficient Use, and Preservation of the Navigable Airspace, provides <br />standards and procedures to protect the continued safe and efficient use of <br />airspace. 14 CFR Part 77.19, Civil Airport Imaginary Surfaces, defines the five civil <br />Facility Requirements Chapter Page 53 of 70 <br />October 2020 <br /> <br />