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GLOSSARY <br />APPENDIX A <br />APPROACH SPEED <br />: The recommended speed contained in aircraft manuals used by pilots when <br />making an approach to landing. This speed will vary for different segments of an approach as well as for <br />aircraft weight and configuration. (AIM) <br />AUTOMATED WEATHER OBSERVING SYSTEM (AWOS) <br />: Airport electronic equipment which <br />automatically measures meteorological parameters, reduces and analyzes the data via computer, and <br />broadcasts weather information which can be received on aircraft radios in some applications, via <br />telephone. <br />AUTOMATIC DIRECTION FINDER (ADF) <br />: An aircraft radio navigation system which senses and <br />indicates the direction to a L/MF nondirectional radio beacon (NDB) ground transmitter. (AIM) <br />AUTOMATIC TERMINAL INFORMATION SERVICE (ATIS) <br />: The continuous broadcast of recorded non- <br />control information in selected terminal areas. (AIM) <br />BACK COURSE APPROACH <br />: A non-precision instrument approach utilizing the rearward projection of <br />the ILS localizer beam. <br />BALANCED FIELD LENGTH <br />: The runway length at which the distance required for a given aircraft to <br />abort a takeoff and stop on the runway (accelerate-stop distance) equals the distance required to <br />continue the takeoff and reach a height of 35 feet above the runway end (accelerate-go distance). <br />BASED AIRCRAFT <br />: Aircraft stationed at an airport on a long-term basis. <br />BUILDING RESTRICTION LINE (BRL) <br />: A line which identifies suitable building area locations on <br />airports. <br />CEILING <br />: Height above the earth's surface to the lowest layer of clouds or obscuring phenomena that is <br />reported as "broken", "overcast", or "obscuration" and is not classified as "thin" or "partial". (AIM) <br />CERTIFICATED ROUTE AIR CARRIER <br />: An air carrier holding a Certificate of Public Convenience and <br />Necessity issued by the Department of Transportation authorizing the performance of scheduled service <br />over specified routes, and a limited amount of nonscheduled service. (FAA Census) <br />CIRCLING APPROACH/CIRCLE-TO-LAND MANEUVER <br />: A maneuver initiated by the pilot to align the <br />aircraft with a runway for landing when a straight-in landing from an instrument approach is not possible <br />or is not desirable. (AIM) <br />COMMERCIAL OPERATOR <br />: A person who, for compensation or hire, engages in the carriage by aircraft <br />in air commerce of persons or property, other than as an air carrier. (FAR 1) <br />COMPASS LOCATOR <br />: A low power, low or medium frequency (L/MF) radio beacon installed at the site <br />of the outer or middle marker of an instrument landing system (ILS). (AIM) <br />COMPASS ROSE <br />: A circle, graduated in degrees, printed on some charts or marked on the ground at an <br />airport. It is used as a reference to either true or magnetic direction. (AIM) <br />COMMUNITY NOISE EQUIVALENT LEVEL (CNEL) <br />: The noise rating adopted by the State of California <br />for measurement of airport noise. It represents the average daytime noise level during a 24-hour day, <br />A-3 <br />Eugene Airport Master Plan Update <br />(February 2010) <br /> <br />