BENDIXKing AeroNav 910 Pilot's Manual page 290

AeroNav 900/880 Series Pilot's Guide
ADS-B Unavailable Products Page
The ADS-B Unavailable Products Page shows the contents of the
FIS-B Product Updates Unavailable Report. That report provides
notification to users of outage of individual FIS-B product updates
or the entire FIS-B service. If 20 minutes has elapsed since the
AeroNav last received the FIS-B Product Updates Unavailable
report, the report will be removed.
ADS-B Unavailable Products Page
89000039-010
5-66 Aux Subsystem Rev 1 May 2019