AIM
8/15/19
4
−
5
−
21
Surveillance Systems
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.)
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.