ADS-B Source Integrity Level

[eddies]

Hi Guys,

I have a Dynon Skyview D1000 with Dynon GPS and Dynon Transponder.

I have just received a letter from Airservices Australia asking if my ADS-B out transmissions are GNSS compliant meaning that the ADS-B information can be used for separation?

Could you answer this question for me?

Cheers
Eddie

 

[dynonsupport]

Eddie,
When using the Dynon GPS module as a position source, the ADS-B info cannot be used for separation. It is transmitted as "no integrity" and will be ignored by most devices.

Airservices already knows this. It's in one of their own documents that we worked with them on.

From here, page 15:
http://www.airservicesaustralia.com/wp-content/uploads/FAQ-ADS-B-Final-18MAR12.pdf

Can I use the Dynon Skyview Transponder as an ADS-B solution in Australia?

Yes, provided you have a certified GPS in your aircraft.

The Dynon Skyview Transponder is a fully certified device and is ADS-B OUT compliant. However no GPS that Dynon sells is certified and thus the Dynon GPS solution is not suitable as a position source for ADS-B in Australia. Dynon have made allowance for the user to connect a compliant GPS such as a Freeflight or a Garmin GPS directly to the transponder. Connection of a certified GPS to the SkyView screen alone is not sufficient. You need Skyview version 5.0 or better and the installer has to tell the Skyview that a directly connected compliant GPS source is being used. In the transponder setup menu, there is a GPS DATA item in the menu. If this is set to "DIRECT (GARMIN ADS-B)" or "DIRECT (FREEFLIGHT)" then they are configured for a direct, TSO'd connection to the GPS. It is easy for a user to verify the system is doing the right thing – if the "GPS STATUS" indicates valid data, then the device is transmitting GPS data from the TSO'd GPS. Refer to the SkyView install manual or contact Dynon technical support for more detail. If no direct connection to a compliant GPS is made, ADS-B messages will still be transmitted, but will be ignored by most receivers because the transmitted "quality" flags will indicate that the data is not trustworthy.

 

[eddies]

Thanks for the update.

At least now I can give them a sensible reply.

Cheers
Eddie

 

[jakej]

Thanks for the update.

At least now I can give them a sensible reply.

Cheers
Eddie

Eddie

My understanding is everyone here will be/are receiving those letters.  They, Airservices, are basically getting you to confirm as to what you have installed & set up.  Too long a story to post here.
The only Gps that should be connected directly to the Transponder (via a 1.2K resistor) is a Tso 145/146 Gps, all other Gps's can go to the SV via a serial port.  If you are using the SV GPS then in the Transponder setup you should set Skyview as the source, nothing else.

Jake J