Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. C
Page 38 of 95
DUAL GPS/SBAS FAILURE (AMBER “DR” OR “LOI” ON HSI)
LOSS OF GPS/SBAS NAVIGATION DATA
When both GPS/SBAS receivers are inoperative or GPS navigation information is not available or
invalid, the G1000 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 or periodically cross-check the GPS guidance to other, approved means
of navigation.
In Dead Reckoning mode, the MAP – NAVIGATION MAP will continue to be displayed with a
ghosted aircraft icon in the center and an amber ‘DR’ overwriting the icon. Aircraft 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.
¾ IF ALTERNATE NAVIGATION SOURCES (ILS, LOC, VOR, DME, ADF) ARE AVAILABLE
1. Navigation ................................................................................. USE ALTERNATE SOURCES
¾ IF NO ALTERNATE NAVIGATION SOURCES ARE AVAILABLE
 DEAD RECKONING (DR) MODE - ACTIVE WHEN THE AIRPLANE IS GREATER THAN 30
NM FROM THE DESTINATION AIRPORT.
1. Navigation - Use the airplane symbol and magenta course line on the map display.
NOTE
• ALL INFORMATION NORMALLY DERIVED FROM GPS TURNS AMBER. ALL OF THIS
INFORMATION WILL BECOME LESS ACCURATE OVER TIME.
• TAWS IS INOPERATIVE
• DR mode uses heading, true airspeed, last known wind data, and the last known GPS
position to estimate the airplane’s current position.
• MAP – TRAFFIC MAP display is not dependent on GPS information. The position of
displayed traffic relative to the airplane symbol on the map is still accurate.
 LOSS OF INTEGRITY (LOI) MODE - ACTIVE WHEN THE AIRPLANE IS WITHIN 30NM OF
THE DESTINATION OR DEPARTURE AIRPORT (AS CALCULATED FROM THE PREVIOUS
GPS OR DR POSITION).
1. Navigation - Fly towards known visual conditions. Use ATC or other information sources as
possible.
NOTE
• All information derived from GPS or DR will be removed from the displays
• TAWS IS INOPERATIVE.