9-9
190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Traffic
9.3.6 TIS Alerts
When the number of Traffic Advisories (TAs) on the Traffic Map page increases
from one scan to the next, the following occur:
• A single “Traffic” voice alert is generated.
• A TRAFFIC Annunciation appears at the bottom of the display, flashing for
5 seconds and remaining displayed until no TAs are detected in the area.
To reduce the number of nuisance alerts due to proximate aircraft, the
“Traffic” voice alert is generated only when the number of TAs increases. For
example, when the first TA is displayed, a voice and visual annunciation are
generated. As long as a single TA remains on the display, no additional voice
alerts are generated. If a second TA appears on the display or if the number of
TAs initially decreases and then subsequently increases, another voice alert is
generated.
A “Traffic Not Available” (TNA) voice alert is generated when the TIS service
becomes unavailable or is out of range.
Traffic may not be displayed in the radar coverage area due to the following:
• Radar site TIS Mode S sensor is not operational or is out of service.
• Traffic or requesting aircraft is beyond the maximum range of the
TIS-capable Mode S radar site.
• Traffic or requesting aircraft is above the radar site in the cone of silence and
out of range of an adjacent site.
• Traffic or requesting aircraft is below radar coverage. In flat terrain, the
coverage extends from about 3,000 feet upward at 55 miles. Terrain and
obstacles around the radar site can further decrease radar coverage in all
directions.
• Traffic does not have an operating transponder.
Summary of Contents for GTN 625
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