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AIRPORT MASTER PLAN <br />to the apron, as unfamiliar pilots sometimes miss the turn to Taxiway Alphawhen <br />taxiing northwest on Taxiway Charlie. Solutions to this issue will be considered in <br />the alternatives chapter. <br />Approach Lighting Systems <br />An Approach Lighting System (ALS) provides the basic means to transition from <br />instrument flight to visual flight for landing. An ALS is a configuration of signal lights <br />starting at the landing threshold and extending into the approach area for a <br />distance of 2400-3000 feet for precision instrument runways and 1400-1500 feet for <br />non-precision instrument runways. Some systems include sequenced flashing lights <br />that appear to the pilot as a ball of light traveling towards the runway at high speed. <br />Operational requirements dictate the sophistication and configuration of the ALS <br />for a runway. Depending on the type of approach, certain ALS are required to aide <br />pilots in the identification of the airport environment during instrument <br />meteorological conditions. These requirements are found in FAA AC 150/5300-13 <br />(current edition). It should be noted that ALS systems are required for runways with <br />precision instrument approaches. <br />As part of the ILS, Runway 13 has a Medium Intensity Approach Lighting System <br />with Runway Alignment Indicator Lights (MALSR). The Runway Alignment Indicator <br />Lights (RAILs) are currently out of service, but a project to repair them is planned. <br />The FAA owns and maintains the MALSR. <br />Future consideration for a new ALS will be predicated on user needs, instrument <br />approach minimum requirements, and the restrictions of surrounding property <br />and land use. Based on the forecast of future aeronautical activity and an analysis <br />for future IAP needs at the airport, the MALSR for Runway 13 is expected to be <br />sufficient during the forecast period and no additional ALS systems are expected to <br />be needed. <br />Wind Cone/Segmented Circle/Airport Beacon <br />There are five total windsocks at the San Marcos Regional Airport. The primary <br />windsock is located approximately 385 feet north of Runway 8/26 centerline and <br />approximately 2,150 feet east of the threshold for Runway 8. The windsock is <br />Facility Requirements Chapter Page 49 of 70 <br />October 2020 <br /> <br />