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wort Surveillance Radar (ASRI -Approach control radaz used to <br />detect and display an aircraft's position is a 60-mile radius. <br />(;enterli_ne Lgbtipg~System (CIS) -Aline of lights that identifies the <br />centerline of a runway. <br />Touchdow^ Zone I_i~htin¢ (TDZ) -Alighting system used to identify <br />the area beyond which it is safe to land. <br />These NAVAIDs provide additional capacity at Minneapolis-St. Paul <br />International during inclement weather and instrument-assisted landings. The <br />presence of these additional NAVAIDs at the airport is one factor that draws general <br />aviation activity to Minneapolis-St. Paul International. From acost/benefit <br />standpoint, it is impossible to expect that the reliever airports could duplicate the <br />highly sophisticated level of navigational equipment provided at the airport or that <br />activity levels at the relievers would justify these types of NAVAIDs. This study did, <br />however, review appropriate NAVAID upgrades at the relievers that were justified <br />and had the potential to increase reliever utilization. <br />(4) ~i pQrt Activity Statistics <br />Statistics used to measure historical and current activity levels in the regional <br />aviation system included: <br />Ann„al C=pneral_ Aviation Onerations -The number of general aviation <br />operations for each of the study airports (equal to total general aviation <br />takeoffs plus total landings) for the years 1984 to 1988 (see Table I- <br />6). <br />Number of Ba<ed Aircraft - An aircraft is considered a based aircraft <br />if it is regulazly stored at as airport. Based aircraft counts for the study <br />airports, for the years 1984 to 1989, aze shown in Table I-7. <br /> <br />I-43 <br />