Traffic Information Service Broadcast (TIS-B)
The Traffic Information Service Broadcast (TIS-B) is a component of ADS-B traffic. The TIS-B
broadcast includes non-ADS-B Out equipped traffic on the 978 MHz frequency.
TIS-B is broadcast for the benefit of client aircraft. A client aircraft is any aircraft that is ADS-B
Out equipped. As a result, aircraft are only included in the TIS-B broadcast if they are of
concern to a client aircraft. To be included in the TIS-B broadcast, an aircraft must
•
Operate within 15 nm and 3,500 feet vertically of a client aircraft.
•
Be equipped with an altitude encoding (Mode C) transponder.
•
Operate in the service volume of surveillance radar.
The following aircraft are not included in the TIS-B broadcast
•
Aircraft not operating within 15 nm and 3,500 feet vertically of a client aircraft.
•
Aircraft without transponders.
•
ADS-B Out equipped aircraft.
In the example below, N123AA is included in the TIS-B broadcast because it is within 15 nm
and 3,500’ of a client aircraft. N987ZZ is not included in the TIS-B broadcast because it is
outside the 15 nm requirement. SWA3007 is not included in the TIS-B broadcast because it is
an ADS-B Out equipped aircraft (1090 MHz).
If the client aircraft is equipped with Sentry, SWA3007 and N123AA would be displayed in
ForeFlight. N987ZZ would not be displayed in ForeFlight unless it were to enter the 15 nm
service volume of a client aircraft.
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