Draft EUG Master Plan Update, February 2010

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GLOSSARY APPENDIX A MEDIUM-INTENSITY APPROACH LIGHTING SYSTEM (MALS) : The MALS is a configuration of steady- burning lights arranged symmetrically about and along the extended runway centerline. MALS may also be installed with sequenced flashers in this case, the system is referred to as MALSF. MILITARY OPERATIONS AREA (MOA) : A type of special use airspace of defined vertical and lateral dimensions established outside of Class A airspace to separate/segregate certain military activities from IFR traffic and to identify for VFR traffic where these activities are conducted. (AIM) MINIMUM DESCENT ALTITUDE (MDA) : The lowest altitude, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuvering in execution of a standard instrument approach procedure where no electronic glide slope is provided. (FAR 1) MISSED APPROACH : A maneuver conducted by a pilot when an instrument approach cannot be completed to a landing. (AIM) NAVIGATIONAL AID/NAVAID : Any visual or electronic device airborne or on the surface which provides point-to-point guidance information or position data to aircraft in flight. (AIM) NONDIRECTIONAL BEACON (NDB) : A 4 MF or UHF radio beacon transmitting nondirectional signals whereby the pilot of an aircraft equipped with direction finding equipment can determine his bearing to or from the radio beacon and "home" on or track to or from the station. (AIM) NONPRECISION APPROACH PROCEDURE : A standard instrument approach procedure in which no electronic glide slope is provided. (FAR 1) NONPRECISION INSTRUMENT RUNWAY : A runway with an instrument approach procedure utilizing air navigation facilities, with only horizontal guidance, or area-type navigation equipment for which a straight- in nonprecision instrument approach procedure has been approved or planned, and no precision approach facility or procedure is planned. (Airport Design) OBJECT FREE AREA (OFA) : A surface surrounding runways, taxiways, and taxilanes which should be clear of parked airplanes and objects except for objects that need to be located in the OFA for air navigation or aircraft ground maneuvering purposes. (Airport Design) OBSTACLE : An existing object, object of natural growth, or terrain at a fixed geographical location, or which may be expected at a fixed location within a prescribed area, with reference to which vertical clearance is or must be provided during flight operation. (AIM) OBSTACLE FREE ZONE (OFZ) : A defined volume of airspace above and adjacent to a runway and its approach lighting system if one exists, free of all fixed objects except FAA-approved frangible aeronautical equipment and clear of vehicles and aircraft in the proximity of an airplane conducting an approach, missed approach, landing, takeoff, or departure. OBSTRUCTION : An object/obstacle, including a mobile object, exceeding the obstruction standards specified in FAR Part 77, Subpart C. (AIM) OUTER MARKER : A marker beacon at or near the glide slope intercept position of an ILS approach. (AIM) A-7 Eugene Airport Master Plan Update (February 2010)