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7-3
190-01122-03 Rev. A
GDL 88 ADS-B Transceiver Pilot’s Guide
TCAS Traffic Collision Avoidance System. An aircraft collision
avoidance system designed to reduce the incidence of mid-
air collisions between aircraft. It monitors the airspace around
an aircraft for other aircraft equipped with a corresponding
active transponder, independent of air traffic control, and
warns pilots of the presence of other transponder-equipped
aircraft which may present a threat of mid-air collision.
TIS-B Traffic Information Services-Broadcast. TIS-B supplements
ADS-B’s air-to-air services to provide more situational
awareness in the cockpit of all traffic known to the ATC
system. The ground TIS-B station transmits surveillance target
information on the ADS-B data link for unequipped targets
or targets transmitting only on another ADS-B link. TIS-B is
a free service available to aircraft operators equipped with
ADS-B Out and ADS-B In.
UAT Universal Access Transceiver. The GDL 88 UAT transmits
ADS-B Out data on the 978 MHz (UAT) frequency. The GDL
88 UAT receives ADS-B, ADS-R, TIS-B, and FIS-B on 978 MHz
XPDR Transponder. The equipment which broadcasts aircraft code,
altitude and other information to ground facilities and other
aircraft.