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TRANSITION POINT (P/CG) - A point at an adapted number of miles from the vertex at which an arrival aircraft would normally commence descent from its en route altitude. This is the first fix adapted on the arrival speed segments.
TRANSITIONAL AIRSPACE (P-CG) - That portion of controlled airspace wherein aircraft change from one phase of flight or flight condition to another.
TRANSMISSOMETER - An apparatus used to determine visibility by measuring the transmission of light through the atmosphere. It is the measurement source for determining Runway Visual Range (RVR) and Runway Visibility Value (RVV). (See Visibility)
TRANSMITTING IN THE BLIND/BLIND TRANSMISSION - A transmission from one station to another station in circumstances where two-way communication cannot be established, but where it is believed that the called station may be able to receive the transmission.
TRANSPONDER (P/CG) - The airborne radar beacon receiver/transmitter portion of the Air Traffic Control Radar Beacon System (ATCRBS) which automatically receives radio signals from interrogators on the ground, and selectively replies with a specific reply pulse or pulse group only to those interrogations being received on the mode to which it is set to respond. (See Interrogator)
TRANSPONDER (JCS, NATO, ICAO) - A receiver/transmitter which will generate a reply signal upon proper interrogation; the interrogation and reply being on different frequencies.
TURBOJET AIRCRAFT - An aircraft having a jet engine in which the energy of the jet operates a turbine which in turn operates the air compressor.
TURBOPROP AIRCRAFT - An aircraft having a jet engine in which the energy of the jet operates a turbine which drives the propeller.
TVOR/TERMINAL-VERY HIGH FREQUENCY OMNIDIRECTIONAL RANGE STATION - A very high frequency terminal omnirange station located on or near an airport and used as an approach aid. (See VOR, Navigational Aid)
TWO WAY RADIO COMMUNICATIONS FAILURE - (See Lost Communications)
ULTRAHIGH FREQUENCY/UHF - The frequency band between 300 and 3,000 megahertz. The bank of radio frequencies used for military air/ground voice communications. In some instances this may go as low as 225 megahertz and still be referred to as UHF.
ULTRALIGHT VEHICLE - An aeronautical vehicle operated for sport or recreational purposes which does not require Federal Aviation Administration registration, an airworthiness certificate, nor pilot certification. They are primarily single occupant vehicles, although some two-place vehicles are authorized for training purposes. Operation of an ultralight vehicle in certain airspace requires authorization from Air Traffic Control. (See Federal Air Regulations 103)
UNABLE - Indicates inability to comply with a specific instruction, request, or clearance.
UNCONTROLLED AIRSPACE - Uncontrolled airspace is that portion of the airspace that has not been designated as Continental Control Area, Control Area, Control Zone, Terminal Control Area, or Transition Area and within which Air Traffic Control has neither the authority nor the responsibility for exercising control over air traffic. (See Controlled Airspace)
UNDER THE HOOD - Indicates that the pilot is using a hood to restrict visibility outside the cockpit while simulating instrument flight. An appropriately rated pilot is required in the other control seat while this operation is being conducted. (Refer to Federal Air Regulations Part 91)
UNICOM - A non-government communications facility which may provide airport advisory information at certain airports. Locations and frequencies of UNICOMs are shown on aeronautical charts and publications.
UNPUBLISHED ROUTE - A route for which no minimum altitude is published or charted for pilot use. It may include a direct route between navigational aids, a radial, a radar vector, or a final approach course beyond the segments of an instrument approach procedure. (See Route, Published Route)
UPPER CONTROL AREA/UTA (ICAO) - Controlled Airspace within an Upper Flight Information Region.
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FLIGHT INFORMATION PUBLICATION GENERAL PLANNING(82)
