Transponder Operation
SkyView HDX Pilot’s User Guide – Revision B 7-17
When an SV-XPNDR-261 is connected to a suitable GPS source and is running the latest version
of transponder software, the SV-XPNDR-261’s ADS-B transmissions can attain the integrity level
necessary to meet the FAA’s 2020 ADS-B equipment mandate. Refer to the SkyView Classic / SE
/ HDX System Installation Guide for more details about connectivity and information on
updating the firmware on the SV-XPNDR-261 for this compliance. Note that only the SV-XPNDR-
261 is capable of meeting the 2020 ADS-B Out mandate because of power transmission
requirements that the FAA ADS-B rules imposes on ADS-B transmitter devices.
If you are operating within the United States, there may be a service bulletin which
applies to your transponder, please see the Service Bulletins section of our website
for more information.
Flight Plan Codes
ICAO Flight Plans
If your aircraft is equipped with a Dynon Mode-S transponder, a certified GPS navigator or SV-
GPS-2020, the appropriate ICAO Surveillance Equipment Code is "EB1". The E adds ADS-B
credit, and the B1 indicates that you are 1090 OUT.
If you do not have a certified GPS navigator on board, but do have a Dynon Avionics Mode-S
transponder, the appropriate ICAO Surveillance Equipment Code is "S".
FAA Flight Plans
If your aircraft is equipped with a Dynon Avionics Mode-S transponder and an IFR certified GPS
navigator, you may file /G, which indicates that you have at least a Mode C transponder and
RNAV capability with GNSS (GPS).
If your aircraft does not have an IFR certified GPS navigator, but you do have a Dynon Avionics
Mode-S transponder, you should file /U to indicate you have at least a Mode C transponder.
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