Dual GPS/SBAS failure (
DR
or
GPS LOI
annunciation on HSI)
1 / 2
Indicates a loss of GPS/SBAS navigation data.
When both GPS/SBAS receivers are inoperative or GPS navigation information is
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
GPS LOI
.
Which mode is active depends on the distance from the destination airport in the
active flight plan.
If the
GPS LOI
annunciation is displayed, revert to an alternate means of
navigation appropriate to the route and phase of flight.
In Dead Reckoning mode, the MAP–NAVIGATION MAP will continue to be
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.
Revert to an alternate means of navigation appropriate to the route and phase of
flight.
If alternate navigation sources (ILS, LOC, VOR, DME, ADF) are available:
1
- Navigation ........................................................... Use alternate sources
If no alternate navigation sources are available:
Dead Reckoning (DR) Mode - Active when the airplane is greater than 30NM
from the destination airport:
2
- Navigation ...... Use the airplane symbol, magenta course line on
the map display and the amber CDI for course information
Continue ►
Pilot's Information Manual
Section 3A
Abnormal Procedures
PIM TBM 960 - Edition 0
Rev. 00
Page 3A.12.7
PIM - DO NOT USE FOR FLIGHT OPERATIONS
