4-5-10. Automatic Dependent
Surveillance-Rebroadcast (ADS-R)
a. Introduction.
ADS-R is a datalink translation function of the
ADS-B ground system required to accommodate the
two separate operating frequencies (978 MHz and
1090 ES). The ADS-B system receives the ADS-B
messages transmitted on one frequency and ADS-R
translates and reformats the information for
rebroadcast and use on the other frequency. This
allows ADS-B In equipped aircraft to see nearby
ADS-B Out traffic regardless of the operating link of
the other aircraft. Aircraft operating on the same
ADS-B frequency exchange information directly
and do not require the ADS-R translation function.
(See FIG 4-5-8 and FIG 4-5-9.)

Surveillance Systems

b. Reports of ADS-R Malfunctions.
Users of ADS-R can provide valuable assistance in
the correction of malfunctions by reporting instances
of undesirable system performance. Since ADS-R
performance is monitored by maintenance personnel
rather than ATC, report malfunctions to the nearest
Flight Service Station (FSS) facility by radio or
telephone. Reporters should identify:
1. Condition observed.
2. Date and time of observation.
3. Altitude and location of observation.
4. Type and call sign of the aircraft.
5. Type and software version of avionics
system.

4-5-21