Well, one of the 2 WAAS satellites will be dead in a very short time. I wonder how quickly they will respond to get the system back to spec. Don't pull out your VOR equipment, yet ...
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Because GEO signals will be single string, there may be service interruptions if the GEO uplink stations switch from primary to backup. These switchovers are rare events, but if one occurs it may take up to 5 minutes to fully restore LPV service.
The impending failure of this satellite—which only affects WAAS signals—comes at a time when there are questions about the regular GPS constellation. The U.S. Government Accountability Office has said that many of the older satellites currently in use could reach the end of their operational life faster than they can be replenished, resulting in a drop below the number of satellites needed to meet some GPS users’ needs, as early as this year. "