Pilot's Guide

190-00663-03 Rev. A
Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT/GTi
379
HAZARD AVOIDANCE
Figure 6-94 TAWS-B Page Menu
TAWS-B continually monitors several system-critical items such as database validity, hardware status, and
GPS status. If the terrain/obstacle database is not available, the voice alert “TAWS System Failure” is generated
along with the ‘TAWS FAIL’ visual annunciation.
TAWS-B requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Should the
navigation solution become degraded or if the aircraft is out of the database coverage area, the annunciation
‘TAWS N/A’ is generated in the annunciation window and on the TAWS-B Page. If in-flight, the voice alert
“TAWS Not Available” is also generated. When the GPS signal is restored and the aircraft is within the
database coverage area, the voice alert “TAWS Available” is generated.
Alert Type
PFD/MFD
TAWS-B Page
Annunciation
TAWS-B Page Center
Banner Annunciation
Voice Alert
TAWS Alert
Types
Not
Available
System Test in progress
TAWS TEST
None None Available
System Test pass None None “TAWS System Test OK”
TAWS System Test Fail; Terrain,
Airport Terrain or Obstacle
database unavailable or invalid
on all GDUs; software mismatch
among GDUs; TAWS audio fault
TAWS FAIL “TAWS System Failure” FLTA, PDA
MFD Terrain or Obstacle database
unavailable or invalid. TAWS
operating with PFD Terrain or
Obstacle databases
None
TERRAIN DATABASE
FAILURE
None
No GPS position
NO GPS POSITION
“TAWS Not Available” FLTA, PDA,
VCO
Excessively degraded GPS signal, or
out of database coverage area
None “TAWS Not Available” FLTA, PDA
Sufficient GPS signal reception
restored
None
None “TAWS Available”
(voice alert only in
flight)
TAWS Alerting is disabled None None FLTA, PDA
Table 6-10 TAWS-B System Status Annunciations