Airplane Flight Manual Supplement

AFMS, Garmin GNS 5XXW GPS/SBAS System 190-00357-03 Rev. E
FAA APPROVED Page 15 of 22
If Alternate Navigation Sources (ILS, LOC, VOR, DME, ADF) Are
Available:
Navigation ........................................................ USE ALTERNATE SOURCES
If No Alternate Navigation Sources Are Available:
DEAD RECKONING (DR) MODE:
Navigation ............................................................................................. USE GNS
NOTE
All information normally derived from GPS will become less
accurate over time.
LOSS OF INTEGRITY (LOI) MODE:
Navigation ..................... FLY TOWARDS KNOWN VISUAL CONDITIONS
NOTE
All information derived from GPS will be removed.
NOTE
The airplane symbol is removed from all maps. The map will
remain centered at the last known position. “No GPS
Position” will be annunciated in the center of the map.
3.2.2 GPS APPROACH DOWNGRADE
During a GPS LPV, LNAV/VNAV, LP +V, or LNAV+V approach, if GPS
accuracy requirements cannot be met by the GPS receiver prior to the Final
Approach Fix, the GNS will downgrade the approach. The downgrade will
remove vertical deviation indication from the VDI and change the approach
annunciation accordingly from LPV, L/VNAV, LP +V, or LNAV+V to LNAV.
The approach may be continued using the LNAV only minimums. After the
Final Approach Fix has been passed, the approach will be aborted using the
indications described below.
During a GPS approach in which GPS accuracy requirements cannot be met by
the GPS receiver for any GPS approach type, the GNS will flag all CDI
guidance and display a system message “ABORT APPROACH - Loss of
Navigation”. Immediately upon viewing the message, the unit will revert to
Terminal navigation mode alarm limits. If the position integrity is within these
limits lateral guidance will be restored and the GPS may be used to execute the
missed approach, otherwise alternate means of navigation must be utilized.