TARGET- The indication shown on a display resulting from a primary radar return, a radar beacon reply, or an ADS-B report. TAKEOFF RUN AVAILABLE - 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. For helicopters, this pertains to the act of becoming airborne after departing a takeoff area. TAKEOFF ROLL - The process whereby an aircraft is aligned with the runway centerline and the aircraft is moving with the intent to take off. Illuminated red lights indicate to an aircraft in position for takeoff or rolling that it is unsafe to takeoff because the runway is occupied or about to be occupied by an aircraft or vehicle. The lights are focused toward the arrival end of the runway at the "line up and wait" point, and they extend for 1,500 feet in front of the holding aircraft. TAKEOFF HOLD LIGHTS (THL)- The THL system is composed of in-pavement lighting in a double, longitudinal row of lights aligned either side of the runway centerline. TAKEOFF DISTANCE AVAILABLE - The length of the takeoff run available plus the length of the clearway, if provided. (See ICAO term TAKEOFF DISTANCE AVAILABLE.) TAKEOFF DISTANCE AVAILABLE (TODA)- The takeoff run available plus the length of any remaining runway or clearway beyond the far end of the takeoff run available. The magnetic direction of the runway shall be used as the basis for determining the longitudinal axis. TAILWIND- Any wind more than 90 degrees to the longitudinal axis of the runway. TACTICAL AIR NAVIGATION (TACAN)- An ultra-high frequency electronic rho-theta air navigation aid which provides suitably equipped aircraft a continuous indication of bearing and distance to the TACAN station. Clearances must specify TACAN or VORTAC fixes and approaches. TACAN-ONLY AIRCRAFT- An aircraft, normally military, possessing TACAN with DME but no VOR navigational system capability.
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