GPS 400 Pilot’s Guide and Reference
190-00140-60 Rev. H
SECTION 11 – FAULT DETECTION
AND EXCLUSION
11-2
11.2 PRE-DEPARTURE VERIFICATION OF FDE
Since
FDE is based upon the exclusion of “bad” satellites,
it is necessary to ensure there will be an adequate number
of satellites in the GPS constellation that are still able to
provide a navigation solution. An FDE prediction must be
performed prior to departure for a flight involving:
• Oceanic/Remote operation where GPS is to be the
sole source of navigation per FAA Notice 8110.60.
• U.S. Area Navigation (RNAV) routes, Standard
Instrument Departures (SIDs), or Standard Termi
-
nal Arrival Routes (STARs) if a NOTAM indicates a
GPS satellite (or satellites) is scheduled to be out-
of-service, per FAA AC 90-100 ‘U.S. Terminal and
En Route Area Navigation (RNAV) Operations’.
Prior to departure, the operator must use the
FDE
Prediction Program supplied with the 400-series Trainer
Software (Figure 11-2) to demonstrate that there are no
outages in the capability to navigate on the specified
route of flight (the
FDE Prediction Program determines
whether the GPS constellation is robust enough to provide
a navigation solution for the specified route of flight). The
trainer software and the document “400/500-series FDE
Prediction Instructions” (190-00643-00) are available on
Garmin’s website for free download (www.garmin.com).
Figure 11-2 Garmin 400-Series Trainer Software
.
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