BENDIXKing AeroNav 910 Pilot's Manual page 343

Don't Sink
TAWS NCR algorithm has determined corrective action
should be taken immediately.
TAWS Fail
The GPS solution is lost or the GPS velocity quality
parameters drop below required accuracy limits. A "bing-
bong" chime is played if this condition occurs. Contact the
BendixKing Service Center if this persists across power
cycles.
TAWS System
Failure
TAWS failed self-test for the <reason> provided and
TAWS will be degraded or not available for the duration of
this power cycle. Contact the BendixKing Service Center
if this persists across power cycles.
89000039-010
Rev 1 May 2019
AeroNav 900/880 Series Pilot's Guide
Negative climb rate or altitude loss
Invalid GPS Position/Velocity
TAWS Failed Self-Test <reason>
General 7-13