Garmin GNC 420AW GPS Receiver User Manual


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10 - FDE
180
190-00356-00 Rev E
Section 10
Fault Detection & Exclusion
The Garmin 400W-series software incorporates
aFaultDetectionandExclusion(FDE)algorithm,
thus providing a basis for approval per FAA Notice
N8110.60 requirements for “GPS as a Primary Means
of Navigation for Oceanic/Remote Operations”.
TheFDEconsistsoftwodistinctfeatures,fault
detection and fault exclusion. The fault detection
feature detects the presence of an unacceptably large
pseudorange error for a satellite (and presumably,
position error) for a given mode of flight. Upon detec-
tion, fault exclusion follows and excludes the source
of the unacceptably large pseudorange error, thereby
allowing navigation to return to normal performance
without an interruption in service. To enhance safety,
FDEfunctionalityisprovidedforotherphasesofight
(non-precisionapproach,terminal,enroute).TheFDE
functionality for non-oceanic flight phases complies
with missed alert probability, false alert probability and
failedexclusionprobabilityspeciedbyDO-229C/
TSO-C146a.
Detection and Exclusion
AnFDEpredictionmustbeperformedpriorto
departure for a flight plan involving Oceanic/Remote
operation where GPS is to be the sole source of
navigation. Prior to departure, the operator must
usetheFDEpredictionprogramsuppliedwiththe
400W/500W-series TrainerCDtodemonstratethat
there are no outages in the capability to navigate
onthespeciedrouteofight(theFDEprediction
program determines whether the GPS constellation is
robust enough to provide a navigation solution for the
specified route of flight). Please, refer to the instruc-
tions included in the Garmin 400W/500W-series
TrainingCDforcompletedetailsonusingtheFDE
prediction program.
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