190-00726-00 Rev. J Garmin G900X Pilot’s Guide 455HAZARD AVOIDANCESYSTEMOVERVIEW FLIGHTINSTRUMENTS EIS AUDIO PANEL& CNS FLIGHTMANAGEMENT HAZARDAVOIDANCE AFCS ADDITIONALFEATURES APPENDICES INDEXFigure 6-155 Negative Climb Rate (NCR) Sink Rate010020030040050060070080090010000 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000Sink Rate (FPM)Height Above Terrain (Feet)“DON’T SINK”or“TOO LOW, TERRAIN”SYSTEM STATUSDuring power-up, TAWS-B conducts a self-test of its aural and visual annunciations. The system test can alsobe manually initiated. An aural alert is issued at test completion. TAWS-B System Testing is disabled whenground speed exceeds 30 knots.Manually testing the TAWS-B System:1) Select the TAWS-B Page.2) Press the MENU Key (Figure 6-156).3) Select ‘Test TAWS System’ and press the ENT Key to confirm the selection.Figure 6-156 TAWS-B Page MenuTAWS-B continually monitors several system-critical items such as database validity, hardware status, andGPS status. If the terrain/obstacle database is not available, the aural message “TAWS System Failure” isgenerated along with the ‘TAWS FAIL’ alert annunciation.TAWS-B requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Shouldthe navigation solution become degraded or if the aircraft is out of the database coverage area, the systemdisplays the ‘TAWS N/A’ annunciation, and issues the “TAWS Not Available” aural message. When the GPSsignal integrity returns and the aircraft is within the database coverage area, the system issues the aural “TAWSAvailable” message.
