190-00820-11 Rev. A
Pilot’s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin
479
HAZARD AVOIDANCE
SY
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O
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FLIGHT
INSTRUMENTS
EIS
AUDIO P
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HAZARD
AV
OID
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AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
For the purpose of distinguishing between levels of ADS-B service, there are three classifications of aircraft or
system capability: ADS-B In, ADS-B Out, and ADS-B participating. ADS-B In refers to the capability to receive
ADS-B information. ADS-B Out refers to the capability to transmit ADS-B information. ADS-B participating
refers to the capability to both send and receive ADS-B information. Aircraft lacking either ADS-In, ADS-B Out,
or both ADS-B capabilities may also be referred to as ADS-B nonparticipating aircraft.
AUTOMATIC DEPENDENT SURVEILLANCE-REBROADCAST (ADS-R)
Because it is not required that ADS-B In capable aircraft be able to receive ADS-B data on both the 1090
MHz and 978 MHz data links, a method exists to get data from one data link to the other. ADS-R is the
rebroadcast of ADS-B data by FAA ground stations, which provide this service by taking data from one link
and rebroadcasting it on the other link. For example, two aircraft are in the service volume for a ground
station, and one is transmitting on 1090 MHz and the other on 978 MHz, the ground station retransmits the
data from each aircraft on the other link to ensure the two aircraft can “see” each other.
Figure 6-194 ADS-R Operation - FAA Illustration
The GDL 88 is capable of receiving ADS-B traffic reports directly on the 1090 MHz ES data link in addition
to the 978 MHz UAT data link. This allows the GDL 88 to receive ADS-B position reports on both frequencies
from aircraft in the vicinity, without relying on ADS-R ground station coverage.
TRAFFIC INFORMATION SERVICE-BROADCAST (TIS-B)
TIS-B provides the bridge between the radar-based ATC system and the ADS-B-based system. When an
ADS-B In or Out capable aircraft is within the service volume of an FAA ADS-B ground station, the ground
station broadcasts a portion of the ATC radar data to the aircraft. This aircraft is then included in the list of
aircraft being provided TIS-B service and is then considered a “TIS-B participant.”
TIS-B coverage is available when the aircraft is within ground station coverage, in Secondary Surveillance
Radar coverage, and the other aircraft is also in Secondary Surveillance Radar coverage, and is transmitting
its altitude.
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