Garmin Software Version 0435.24 Guia do Utilizador Página 82

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Garmin G1000 Cockpit Reference Guide for the Cessna Citation Mustang
190-00600-04 Rev. A
66
Abnormal Operation
Flight
InstrumentsEICAS
Nav/Com/
XPDR/AudioAFCSGPS Nav
Flight
PlanningProcedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
AlertsAppendixIndex
DR Mode is inherently less accurate than the standard GPS/SBAS Mode due to the
lack of satellite measurements needed to determine a position. Changes in wind speed
and/or wind direction compounds the relative inaccuracy of DR Mode. Because of this
degraded accuracy, the crew must maintain position awareness using other navigation
equipment until GPS-derived position data is restored.
Dead Reckoning Indications
Symbolic Aircraft
(Map pages and Inset Map)
CDI ‘DR’ Indication on PFD
As a result of operating in DR Mode, all GPS-derived data is computed based upon
anestimatedpositionandisdisplayedasyellowtextonthedisplaytodenotedegraded
navigation source information. This data includes the following:
• NavigationStatusBoxeldsexceptActiveLeg,TAS,andDTK
• GPSBearingPointer
• WinddataandpointersintheWindDataBoxonthePFD
• CurrentTrackIndicator
• AllBearingPointerDistances
• ActiveFlightPlandistances,bearings,andETEvalues
Also, while the G1000 is in DR Mode, the autopilot will couple to GPS for up to 20
minutes. TAWS is also disabled. Additionally, the accuracy of all nearest information
(airports, airspaces, and waypoints) is questionable. Finally, airspace alerts continue
to function, but with degraded accuracy.
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