Aeronautical Terms beginning with T

Takeoff Distance Available (TODA)

ICAO defines TODA as the length of the takeoff runway available plus the length of the clearway, if provided.


Takeoff Runway Available (TORA)

ICAO defines TORA as the length of runway declared available and suitable for the ground run of an aeroplane takeoff.


Tangent Point (TP)

The point on the VOR/DME RNAV route centerline from which a line perpendicular to the route centerline would pass through the reference facility.


Terminal Arrival Area (TAA)

TAAs are the method by which aircraft are transitioned from the RNAV en route structure to the terminal area with minimal ATC interaction. The TAA consists of a designated volume of airspace designed to allow aircraft to enter a protected area, offering guaranteed obstacle clearance where the initial approach course is intercepted based on the location of the aircraft relative to the airport.


Threshold

The beginning of the part of the runway usable for landing.


Top of Climb (TOC)

An identifiable waypoint representing the point at which cruise altitude is first reached. TOC is calculated based on your current aircraft altitude, climb speed, and cruise altitude. There can only be one TOC waypoint at a time.


Top of Descent (TOD)

Generally utilized in flight management systems, top of descent is an identifiable waypoint representing the point at which descent is first initiated from cruise altitude. TOD is generally calculated using the destination elevation (if available) and the descent speed schedule.


Touchdown and Lift-Off Area (TLOF)

The TLOF is a load bearing, usually paved area at a heliport where the helicopter is permitted to land. The TLOF can be located at ground or rooftop level, or on an elevated structure. The TLOF is normally centered in the FATO.


Touchdown RVR

The RVR visibility readout values obtained from sensors serving the runway touchdown zone.


Touchdown Zone Elevation (TDZE)

The highest elevation in the first 3,000 feet of the landing surface.


Tower En Route Control (TEC)

The control of IFR en route traffic within delegated airspace between two or more adjacent approach control facilities. This service is designed to expedite air traffic and reduces air traffic control and pilot communication requirements.


Traffic Information Service-Broadcast (TIS-B)

An air traffic surveillance system that combines all available traffic information on a single display.


Traffic Management Advisor (TMA)

A software suite that helps air traffic controllers to sequence arriving air traffic.


Transition Altitude (QNH)

The altitude in the vicinity of an airport at or below which the vertical position of an aircraft is controlled by reference to altitudes (MSL).


Transition Height (QFE)

Transition height is the height in the vicinity of an airport at or below which the vertical position of an aircraft is expressed in height above the airport reference datum.


Transition Layer

Transition layer is the airspace between the transition altitude and the transition level. Aircraft descending through the transition layer will set altimeters to local station pressure, while departing aircraft climbing through the transition layer will be using standard altimeter setting (QNE) of 29.92 inches of Mercury, 1013.2 millibars, or 1013.2 hectopascals.


Transition Level (QNE)

The lowest flight level available for use above the transition altitude.


Turn Anticipation

The capability of RNAV systems to determine the point along a course, prior to a turn WP, where a turn should be initiated to provide a smooth path to intercept the succeeding course, and to enunciate the information to the pilot.


Turn WP [Turning Point]

A WP which identifies a change from one course to another.


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