Aviation Maintenance Terms beginning with T
TCAS Potential Threat
Traffic detected by TCAS equipment on board the own-ship, that has met the Potential Threat classification criteria for a TCAS TA and does not meet the Threat Classification criteria for a TCAS RA (RTCA/DO-185B § 1.8). If the ASAS own- ship CDTI display is also used as a TCAS TA display, then information about TCAS potential threats will be conveyed to the CDTI via the ASSAP function.
TCAS Proximate Traffic
Traffic, detected by TCAS equipment on board the own-ship, that is within 1200 feet vertically and 6 NM horizontally of the own-ship (RTCA/DO-185B § 1.8). If the ASA system own-ship CDTI display is also used as a TCAS display, then information about TCAS proximate traffic will be conveyed to the CDTI, possibly via the ASSAP function.
TCAS-Only Traffic
A traffic element about which TCAS has provided surveillance information, but which the ASSAP function has not correlated with traffic from other surveillance sources such as ADS-B, ADS-R, or TIS-B.
Time of Applicability
The time that a particular measurement or parameter is (or was) relevant.
Total Latency
The total time between when the position is measured by the position source (GNSS TOM for GNSS systems) and when the position is transmitted from the aircraft (ADS-B time of transmission).
Track
(1) A sequence of reports from the ASSAP function that all pertain to the same traffic target. (2) Within the ASSAP function, a sequence of estimates of traffic target state that all pertain to the same traffic element.
Track Angle
See Ground Track Angle.
Track State
See State Vector.
Traffic
All aircraft/vehicles that are within the operational vicinity of own-ship.
Traffic Collision Avoidance System
Collision Avoidance systems which rely on transponder interrogations and replies of other airborne aircraft.
Traffic Collision Avoidance System I
TCAS I is the first generation of collision avoidance technology. TCAS I systems are able to monitor the traffic situation around an aircraft and offer information on the approximate bearing and altitude of other aircraft. It can also generate collision warnings in the form of a "Traffic Advisory" (TA). The TA warns the pilot that another aircraft is in near vicinity, announcing "Traffic, traffic", but does not offer any suggested remedy Traffic Collision Avoidance System II.
Traffic Element
An aircraft or vehicle.
Traffic Information Service - Broadcast (TIS-B)
TIS-B is a ground broadcast service provided from an ADS-B ground system network over the UAT and 1090ES links that provides position, velocity, and other information on traffic detected by a secondary surveillance radar, but is not transmitting an ADS-B position.
Traffic Information Service – Broadcast (TIS-B)
A surveillance service that broadcasts traffic information derived from one or more ground surveillance sources to suitably equipped aircraft or surface vehicles, with the intention of supporting ASA applications.
Traffic Selection
Manual process of flight crew selecting a traffic element.
Traffic Symbol
A depiction on the CDTI display of an aircraft or vehicle other than the own-ship.
Traffic-To-Follow
A term used for CAVS which is used to refer to the aircraft preceding ownship.
Transponder
A piece of equipment carried on board an aircraft to support the surveillance of that aircraft by secondary surveillance radar sensors. A transponder receives interrogation signals on 1030 MHz and replies on the 1090 MHz downlink frequency.
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