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• • <br /> TECHNICAL TERMS <br /> - Precision Approach means the approach has an electronic glideslope that <br /> provides descent angle information and descent "alignment" as well as runway <br /> alignment. An example is the ILS. <br /> Runway 27R has an ILS system that allows them to descend down to 200 feet <br /> and then land if they are clear of the clouds and can see the runway. The <br /> minimum visibility is 1 /2 mile. <br /> 27R also has a GPS approach, but probably not more than 20% of aircraft have <br /> GPS receivers. <br /> Non - Precision Approach has no glideslope. A pilot flies the aircraft using <br /> electronic runway alignment, and descends to lower altitudes until passing <br /> intersections or fixes where he or she is then allowed to descend to the next <br /> altitude on the approach until reaching the published approach altitude <br /> minimums. <br /> Runway 27L has a non - precision (VOR/DME) approach. The minimums are 420 <br /> ft and 1 mile visibility. That means the aircraft can descend as low as 420 feet <br /> until they see the runway and then can go below that minimum and land. <br /> 27R has a Non Directional Beacon Approach (NDB) to 27R that has very high <br /> minimums that are at 1300 feet and 1.25 mile visibility. The minimums are high, <br /> making it almost unusable in poor weather, due to an obstruction on the eastern <br /> side of San Leandro. <br /> • <br /> • <br /> • <br />