Aviation and air traffic control terminology · MLC-0104

Aviation and air traffic control terms: T (93)

• TACAN, see Tactical air navigation (TACAN)
• TACAN-only aircraftAn aircraft, normally military, possessing TACAN with DME but no VOR navigational system capability...
• Tactical air navigation (TACAN)An ultra-high frequency electronic rho-theta air navigation aid which provides suitably equipped aircraft a...
• TailwindAny wind more than 90 degrees to the longitudinal axis of the runway. The magnetic direction of the runway...
• Takeoff area, see Landing area
• Takeoff distance available [ICAO]The length of the takeoff run available plus the length of the clearway, if provided.
• Takeoff distance available (TODA)The takeoff run available plus the length of any remaining runway or clearway beyond the far end of the...
• Takeoff hold lights (THL)The THL system is composed of in-pavement lighting in a double, longitudinal row of lights aligned either...
• Takeoff rollThe process whereby an aircraft is aligned with the runway centerline and the aircraft is moving with the...
• Takeoff run available [ICAO]The length of runway declared available and suitable for the ground run of an aeroplane take-off.
• Takeoff run available (TORA)The runway length declared available and suitable for the ground run of an airplane taking off.
• TargetThe indication shown on a display resulting from a primary radar return, a radar beacon reply, or an ADS-B...
• Target [ICAO]In radar:
• Target resolutionA process to ensure that correlated radar targets do not touch. Target resolution must be applied as follows:
• Target symbol, see Target; Target [ICAO]
• Tarmac delayThe holding of an aircraft on the ground either before departure or after landing with no opportunity for its...
• Tarmac delay aircraftAn aircraft whose pilot-in-command has requested to taxi to the ramp, gate, or alternate deplaning area to...
• Tarmac delay requestA request by the pilot-in-command to taxi to the ramp, gate, or alternate deplaning location to comply with...
• TAS, see Terminal automation systems (TAS)
• TAWS, see Terrain awareness warning system (TAWS)
• TaxiThe movement of an airplane under its own power on the surface of an airport (14 CFR section 135.100 [Note])...
• Taxi patternsPatterns established to illustrate the desired flow of ground traffic for the different runways or airport...
• TBM, see Time-based management (TBM)
• TBO, see Trajectory-based operations (TBO)
• TCAS, see Traffic alert and collision avoidance system (TCAS)
• TCH, see Threshold crossing height
• TDLS, see Terminal data link system (TDLS)
• TDZE, see Touchdown zone elevation
• Temporary flight restriction (TFR)A TFR is a regulatory action issued by the FAA via the U.S. NOTAM System, under the authority of United...
• Terminal areaA general term used to describe airspace in which approach control service or airport traffic control service...
• Terminal area facilityA facility providing air traffic control service for arriving and departing IFR, VFR, Special VFR, and on...
• Terminal automation systems (TAS)TAS is used to identify the numerous automated tracking systems including STARS and MEARTS.
• Terminal data link system (TDLS)A system that provides Digital Automatic Terminal Information Service (D-ATIS) both on a specified radio...
• Terminal flight data manager (TFDM)An integrated tower flight data automation system to provide improved airport surface and terminal airspace...
• Terminal radar service areaAirspace surrounding designated airports wherein ATC provides radar vectoring, sequencing, and separation on...
• Terminal sequencing and spacing (TSAS)Extends scheduling and metering capabilities into the terminal area and provides metering automation tools to...
• Terminal VFR radar serviceA national program instituted to extend the terminal radar services provided instrument flight rules (IFR)...
• Terminal-very high frequency omnidirectional range station (TVOR)A very high frequency terminal omnirange station located on or near an airport and used as an approach aid.
• Terrain awareness warning system (TAWS)An on-board, terrain proximity alerting system providing the aircrew `Low Altitude warnings' to allow...
• Terrain followingThe flight of a military aircraft maintaining a constant AGL altitude above the terrain or the highest...
• TetrahedronA device normally located on uncontrolled airports and used as a landing direction indicator. The small end...
• TF, see Terrain following
• TFDM, see Terminal flight data manager (TFDM)
• TGUI, see Timeline graphical user interface (TGUI)
• THA, see Transitional hazard area (THA)
• That is correctThe understanding you have is right.
• The recreational UAS safety test (TRUST)The electronically administered free test required for all recreational UAS operators referred to as the...
• Three-hour tarmac ruleRule that relates to Department of Transportation (DOT) requirements placed on airlines when tarmac delays...
• ThresholdThe beginning of that portion of the runway usable for landing.
• Threshold crossing heightThe theoretical height above the runway threshold at which the aircraft's glideslope antenna would be if the...
• Threshold lights, see Airport lighting
• Tie-in facilityThe FSS primarily responsible for providing FSS services, including telecommunications services for landing...
• Time groupFour digits representing the hour and minutes from the Coordinated Universal Time (UTC) clock. FAA uses UTC...
• Time-based flow management (TBFM)A foundational Decision Support Tool for time-based management in the en route and terminal environments...
• Time-based management (TBM)A methodology for managing the flow of air traffic through the assignment of time at specific points for an...
• Timeline graphical user interface (TGUI)A TBFM display that uses timelines to display the Estimated Time of Arrival and Scheduled Time of Arrival of...
• TIS-B, see Traffic information service-broadcast (TIS-B)
• TMI, see Traffic management initiative (TMI)
• TMPA, see Traffic management program alert
• TMU, see Traffic management unit
• TOD, see Top of descent (TOD)
• TODA, see Takeoff distance available (TODA); Takeoff distance available [ICAO]
• TOI, see Track of interest (TOI)
• Top altitudeIn reference to SID published altitude restrictions, the charted “maintain” altitude contained in the...
• Top of descent (TOD)The point at which an aircraft begins the initial descent.
• TORA, see Takeoff run available (TORA); Takeoff run available [ICAO]
• TorchingThe burning of fuel at the end of an exhaust pipe or stack of a reciprocating aircraft engine, the result of...
• TOS, see Trajectory options set (TOS)
• Total estimated elapsed time [ICAO]For IFR flights, the estimated time required from takeoff to arrive over that designated point, defined by...
• Touch-and-goAn operation by an aircraft that lands and departs on a runway without stopping or exiting the runway.
• Touch-and-go landing, see Touch-and-go
• Touchdowna. The point at which an aircraft first makes contact with the landing surface.
• Touchdown [ICAO]The point where the nominal glide path intercepts the runway.
• Touchdown RVR, see Visibility
• Touchdown zoneThe first 3,000 feet of the runway beginning at the threshold. The area is used for determination of...
• Touchdown zone elevationThe highest elevation in the first 3,000 feet of the landing surface. TDZE is indicated on the instrument...
• Touchdown zone [ICAO]The portion of a runway, beyond the threshold, where it is intended landing aircraft first contact the runway.
• Touchdown zone lighting, see Airport lighting
• TowerA terminal facility that uses air/ground communications, visual signaling, and other devices to provide ATC...
• Tower en route control serviceThe control of IFR en route traffic within delegated airspace between two or more adjacent approach control...
• Tower to tower, see Tower en route control service
• Traceable pressure standardThe facility station pressure instrument, with certification/calibration traceable to the National Institute...
• TrackThe actual flight path of an aircraft over the surface of the earth.
• Track [ICAO]The projection on the earth's surface of the path of an aircraft, the direction of which path at any point is...
• Track of interest resolutionA TOI will normally be considered resolved when: the aircraft/object is no longer airborne; the aircraft...
• Track of interest (TOI)Displayed data representing an airborne object that threatens or has the potential to threaten North America...
• Traffica. A term used by a controller to transfer radar identification of an aircraft to another controller for the...
• Traffic advisoriesAdvisories issued to alert pilots to other known or observed air traffic which may be in such proximity to...
• Traffic alert (aircraft call sign), turn (left/right) immediately, (climb/descend) and maintain (altitude)., see Safety alert
• Traffic alert and collision avoidance system (TCAS)An airborne collision avoidance system based on radar beacon signals which operates independent of...
• Traffic in sightUsed by pilots to inform a controller that previously issued traffic is in sight.
• Traffic information, see Traffic advisories
• Traffic information service-broadcast (TIS-B)The broadcast of ATC derived traffic information to ADS-B equipped (1090ES or UAT) aircraft. The source of...
• Traffic management initiative (TMI)Tools used to manage demand with capacity in the National Airspace System (NAS.) TMIs can be used to manage...
• Traffic management program alertA term used in a Notice to Airmen (NOTAM) issued in conjunction with a special traffic management program to...
• Traffic management unitThe entity in ARTCCs and designated terminals directly involved in the active management of facility traffic...
• Traffic no factorIndicates that the traffic described in a previously issued traffic advisory is no factor.
• Traffic no longer observedIndicates that the traffic described in a previously issued traffic advisory is no longer depicted on radar...
• Traffic patternThe traffic flow that is prescribed for aircraft landing at, taxiing on, or taking off from an airport. The...
• Traffic situation display (TSD)TSD is a computer system that receives radar track data from all 20 CONUS ARTCCs, organizes this data into a...
• TrajectoryA EDST representation of the path an aircraft is predicted to fly based upon a Current Plan or Trial Plan.
• Trajectory altering clearance (TAC)A clearance that alters altitude, speed, heading, or route.
• Trajectory modelingThe automated process of calculating a trajectory.
• Trajectory options set (TOS)A TOS is an electronic message, submitted by the operator, that is used by the Collaborative Trajectory...
• Trajectory-based operations (TBO)An Air Traffic Management method for strategically planning and managing flights throughout the operation by...
• Transfer of communication (TOC)A CPDLC uplink that instructs the pilot to either contact or monitor the next air traffic radio frequency.
• Transfer of controlThat action whereby the responsibility for the separation of an aircraft is transferred from one controller...
• Transfer of control [ICAO]Transfer of responsibility for providing air traffic control service.
• Transferring controllerA controller/facility transferring control of an aircraft to another controller/facility.
• Transferring facility, see Transferring controller
• Transferring unit/controller [ICAO]Air traffic control unit/air traffic controller in the process of transferring the responsibility for...
• TransitionThe general term that describes the change from one phase of flight or flight condition to another; e.g...
• Transition pointA point at an adapted number of miles from the vertex at which an arrival aircraft would normally commence...
• Transitional airspaceThat portion of controlled airspace wherein aircraft change from one phase of flight or flight condition to...
• Transitional hazard area (THA)Used by ATC. Airspace normally associated with an Aircraft Hazard Area within which the flight of aircraft is...
• TransmissometerAn apparatus used to determine visibility by measuring the transmission of light through the atmosphere. It...
• Transmitting in the blindA transmission from one station to other stations in circumstances where two-way communication cannot be...
• TransponderThe airborne radar beacon receiver/transmitter portion of the Air Traffic Control Radar Beacon System...
• Transponder codes, see Codes
• Transponder [ICAO]A receiver/transmitter which will generate a reply signal upon proper interrogation; the interrogation and...
• Transponder observedPhraseology used to inform a VFR pilot the aircraft’s assigned beacon code and position have been observed...
• Trial planA proposed amendment which utilizes automation to analyze and display potential conflicts along the predicted...
• TRSA, see Terminal radar service area
• TRUST, see The recreational UAS safety test (TRUST)
• TSAS, see Terminal sequencing and spacing (TSAS)
• TSD, see Traffic situation display (TSD)
• Turbojet aircraftAn aircraft having a jet engine in which the energy of the jet operates a turbine which in turn operates the...
• Turboprop aircraftAn aircraft having a jet engine in which the energy of the jet operates a turbine which drives the propeller.
• TurbulenceAn atmospheric phenomenon that causes changes in aircraft altitude, attitude, and or airspeed with aircraft...
• Turn anticipation(maneuver anticipation).
• TVOR, see Terminal-very high frequency omnidirectional range station (TVOR)
• Two-way radio communications failure, see Lost communications

93 of 1,122 terms in Aviation and air traffic control terminology (MLC-0104). Request the full dataset.