Order 7110.65P, Air Traffic Control, with changes

2/17/05Pilot/Controller GlossaryUUDF−(See DIRECTION FINDER.)UHF−(See ULTRAHIGH FREQUENCY.)ULTRAHIGH FREQUENCY− The frequency bandbetween 300 and 3,000 MHz. The bank of radiofrequencies used for military air/ground voice communications.In some instances this may go as low as225 MHz and still be referred to as UHF.ULTRALIGHT VEHICLE− An aeronautical vehicleoperated for sport or recreational purposes whichdoes not require FAA registration, an airworthinesscertificate, nor pilot certification. They are primarilysingle occupant vehicles, although some two-placevehicles are authorized for training purposes. Operationof an ultralight vehicle in certain airspacerequires authorization from ATC.(Refer to 14 CFR Part 103.)UNABLE− Indicates inability to comply with aspecific instruction, request, or clearance.UNDER THE HOOD− Indicates that the pilot isusing a hood to restrict visibility outside the cockpitwhile simulating instrument flight. An appropriatelyrated pilot is required in the other control seat whilethis operation is being conducted.(Refer to 14 CFR Part 91.)UNFROZEN− The Scheduled Time of Arrival (STA)tags, which are still being rescheduled by trafficmanagement advisor (TMA) calculations. The aircraftwill remain unfrozen until the time the correspondingestimated time of arrival (ETA) tag passesthe preset freeze horizon for that aircraft’s streamclass. At this point the automatic rescheduling willstop, and the STA becomes “frozen.”UNICOM− A nongovernment communication facilitywhich may provide airport information at certainairports. Locations and frequencies of UNICOMs areshown on aeronautical charts and publications.(See AIRPORT/FACILITY DIRECTORY.)(Refer to AIM.)UNPUBLISHED ROUTE− A route for which nominimum altitude is published or charted for pilotuse. It may include a direct route between NAVAIDs,a radial, a radar vector, or a final approach coursebeyond the segments of an instrument approachprocedure.(See PUBLISHED ROUTE.)(See ROUTE.)UNRELIABLE (GPS/WAAS)− An advisory topilots indicating the expected level of service of theGPS and/or WAAS may not be available. Pilots mustthen determine the adequacy of the signal for desireduse.UPWIND LEG−(See TRAFFIC PATTERN.)URET−(See USER REQUEST EVALUATION TOOL.)URGENCY− A condition of being concerned aboutsafety and of requiring timely but not immediateassistance; a potential distress condition.(See ICAO term URGENCY.)URGENCY [ICAO]− A condition concerning thesafety of an aircraft or other vehicle, or of person onboard or in sight, but which does not requireimmediate assistance.USAFIB−(See ARMY AVIATION FLIGHT INFORMATIONBULLETIN.)USER REQUEST EVALUATION TOOL (URET)−User Request Evaluation Tool is an automated toolprovided at each Radar Associate position in selectedEn Route facilities. This tool utilizes flight and radardata to determine present and future trajectories forall active and proposal aircraft and provides enhanced,automated flight data management.UVDF−(See DIRECTION FINDER.)PCG U−1