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AIM 

6/17/21 

NOTE

 

1. 

Details concerning the content, format, and symbols of 

the various data link products provided should be obtained 
from the specific avionics manufacturer. 

2. 

NOTAM

D and NOTAM

FDC products broadcast via 

FIS

B are limited to those issued or effective within the 

past 30 days. 

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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

messages transmitted on one frequency and ADS

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

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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, or by sending an email to the ADS

B help 

desk at 

adsb@faa.gov

. Reports should include: 

1. 

Condition observed; 

2. 

Date and time of observation; 

3. 

Altitude and location of observation; 

4. 

Type and call sign of the aircraft and; 

5. 

Type and software version of avionics 

system. 

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Surveillance Systems