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INVENTORY OF EXISTING CONDITIONS <br />Transport category aircraft, as well as many charter aircraft and high performance general aviation aircraft <br />that are properly equipped and staffed, operate under IFR. Aircraft flying under IFR are required to comply <br />with routes and altitudes given by air traffic controllers during all phases of flight. The controllers are then <br />responsible for ensuring adequate separation between aircraft, as they may be flying in clouds, snow or <br />other conditions of poor visibility during which the view outside the aircraft is limited. <br />Aircraft approaching the Airport during periods of poor visibility fly through the airport environment and <br />to the runway using predetermined routes called Standardized Instrument Approach Procedures. The <br />pilot’s ability to land without actually seeing the runway landing zone is determined by a number of <br />factors, including approach lighting, navigational aids, aircraft equipment, and pilot qualifications. <br />Table 1-5 summarizes the instrument approaches available at the Airport and the minimum visibility and <br />decision heights associated with each approach. The decision height is the height above the runway <br />surface in which the pilot must have the runway in-sight to continue the landing operation. The Airport <br />also has one published instrument departure procedure, named Eugene Nine. The departure procedure <br />can be used with any runway and uses north and south departure routing. <br />EUGENE AIRPORT MASTER PLAN 1-16 <br /> <br />