Pilot's Operating Handbook
Section 3
Emergency procedures
EASA Approved
Edition 0 - October 31, 2013
Rev. 5
Page 3.12.20
Dual GPS/SBAS failure
( or annunciation on HSI) 1/2
LOI
DR
LOSS OF GPS/SBAS NAVIGATION DATA
When both GPS/SBAS receivers areinoperativeor GPSnavigation informationis not
available or invalid, the GARMIN system will enter one of two modes : Dead
Reckoning mode (DR) or Loss Of Integrity mode (LOI). The mode is indicated on the
HSI by an amber DR or LOI.
Which mode is active depends on the distance from the destination airport in the
active flight plan.
If the LOI annunciation is displayed, revert to an alternate means of navigation
appropriate to the route and phase of flight.
InDeadReckoningmode,the MAP–NAVIGATION MAPwillcontinuetobe displayed
with a ghosted airplane icon in the center and an amber ‘DR’ overwriting the icon.
Airplane position will be based upon the last valid GPS position, then estimated by
Dead Reckoning methods. Changes in true airspeed, altitude, or winds aloft can
affect the estimated position substantially. Dead Reckoning is only available in
Enroute mode; Terminal and Approach modes do not support DR. Course deviation
information will be displayed as an amber CDI on both PFDs and will remain for up
to 20 minutes after GPS position data has been lost. The autopilot and/or flight
director may be coupled in GPS mode while the system is in Dead Reckoning mode.
Refer to the GARMIN Pilot's Guide for further information.
Revertto analternatemeansof navigationappropriatetotherouteand phaseofflight.
If Alternate Navigation Sources (ILS, LOC, VOR, DME, ADF) are available :
1 - Navigation Use alternate sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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