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CHAPTER 13. TROUBLESHOOTING
Bearing Pointers Not Displayed
If the input signal is degraded or lost for a minimum of 5 seconds, the input
source is considered invalid and the bearing pointer is removed from the
display.
The bearing pointer is redisplayed when the input source becomes valid
again for a minimum of 1.5 seconds, or immediately when the input source
provides a valid indication.
Nuisance Alerts
If an alert is previously determined to be erroneous, and is repetitive at a
specific location, the alerting function can be inhibited.
A perceived nuisance alert should be brought to the attention of Sandel.
The ST3400 has an internal recorder that automatically records a minimum
of ten hours of flight data. (Oldest data is automatically overwritten with
most recent data.) This data can be used by Sandel Customer Support to
analyze recent alert activity.
Gray Terrain Cells
Gray terrain cells will be drawn in cases where terrain data is unavailable.
This may also be accompanied by a “TAWS FAIL” message. One
example of this is when flying beyond the coverage region of the currently
loaded terrain database.