4/20/23 

AIM 

NOTE

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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

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D and NOTAM

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FDC products broadcast via FIS

−

B are limited to those issued or effective within the past 30 

days. 

4

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5

−

10.  Automatic Dependent Surveillance

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Rebroadcast (ADS

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R) 

a.  Introduction. 

ADS

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R is a datalink translation function of the ADS

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B ground system required to accommodate the two separate 

operating frequencies (978 MHz and 1090 ES). The ADS

−

B system receives the ADS

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B messages transmitted 

on one frequency and ADS

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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

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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

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5

−

9 and FIG 4

−

5

−

10.) 

b.  Reports of ADS

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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. 

Surveillance Systems 

4

−

5

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27