I am researching about Automatic Dependent Surveillance-Broadcast mode of Mode S currently. On a third party document, I encountered a list of transponder registers to be filled; 05, 06, 07, 08, 09, 0A, 61, 62, 63, 64, 65 as the list of registers.The source is Grappel 2007- ATC 334.

05(Airborne position), 06(Surface Position), 08(Aircraft Id), 09(Airborne velocity) registers seem to be carrying most important data for ADS-B.

Registers from 61 to 65 are called event driven registers, carrying slowly changing data. SHALL these registers have to be filled with correct values to serve ADS-B IN capable systems? What happens if I don' t service these event-driven registers?

Is there a definitive list of registers to fill current settled ADS-B standards?

Note: I have access to many documents, so feel free to refer some well-known ADS-B documents.


1 Answer 1


ADS-B IN systems do require information from the 0x6X registers. These registers hold information like ADS-B protocol version, system design assurance level and position source quality indicators.

Without this information the ADS-B IN system can establish a track, but the quality will be flagged as too low to display.

For reference, get a copy of RTCA DO-260B or EUROCAE ED-102A, whichever is cheaper. They are the Minimum Operational Performance Standards for 1090 MHz Extended Squitter Automatic Dependent Surveillance – Broadcast (ADS-B).

  • $\begingroup$ The MOPS describes several classes of ADS-B equipment, not all of which are applicable. You may get some help in picking the right class by reading TSO-C166b as it includes specific FAA guidance regarding classes and functionality. $\endgroup$
    – Gerry
    Commented Dec 25, 2016 at 0:24
  • $\begingroup$ Gerry, what do you mean with "not applicable"? Perhaps you mean not applicable in the US. However, the TSO you refer to is not applicable outside the US. For all ADS-B specifications the TSO refers to DO-260B. The standard functioning of ADS-B IN, and the necessary registers are described in the MOPS, not in the TSO. $\endgroup$
    – DeltaLima
    Commented Dec 25, 2016 at 1:20
  • $\begingroup$ DO-260B describes a number of classes of ADS-B equipment. The minimum data set required is dependent on the class the manufacturer desires to certificate the equipment to. Note that Class A equipment must support both ADS-B IN and OUT. Class B is ADS-B OUT only. There are other classes for ground vehicles. While the TSO only covers FAA approvals, there is an equivalent ETSO for EASA. DO-260B and ED-102A are harmonized documents so the rules are the same. ADS-B OUT data standards depend on the chosen Class. ADS-B IN data support can be 'universal' or limited to defined applications. $\endgroup$
    – Gerry
    Commented Dec 25, 2016 at 2:29
  • $\begingroup$ Looking back, it's not clear whether the Mehmet is discussing the design of the ADS-B link or it's installation. For installation, information is available in AC 20-165B for ADS-B OUT and AC 20-172B for ADS-B OUT. $\endgroup$
    – Gerry
    Commented Dec 25, 2016 at 2:50
  • $\begingroup$ I was asking about ADS-B OUT data coverage to be exact. Could we "get away" with not updating certain ADS-B allocated registers. Would ignoring some registers anger ATC? $\endgroup$ Commented Jan 17, 2017 at 13:05

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