Garmin GTX 345 Series Manuel du pilote - Page 24
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4.1 Traffic Alerting
To enhance situational awareness, the GTX 345 provides traffic alerting for ADS-B, ADS-
R, and TIS-B targets. An aural message issues when an alert becomes active.
For example, "Traffic! Two O'clock, Low, Two Miles."
Alerting parameters provide enough time after an alert is generated to acquire the target
and maneuver the aircraft away from the conflicting traffic. The alerting parameters
consider:
1. Closure rate of each aircraft (ownship and target)
2. Altitude separation and trend
3. Speed
4. Angle
To minimize nuisance alerts, traffic alerting sensitivity is adaptive based on altitude above
ground level. In fixed winged aircraft no aural alerts are given below 500 feet.
4.2 Helicopter Traffic Alerting
A helicopter with a GTX 345 connected to a Garmin navigator or radar altimeter offers
additional traffic alerting for helicopter operations. Traffic alerting volumes are tailored to
minimize nuisance alerts when operating in an airport environment at less than 200 feet
AGL, and less than 60 knots groundspeed, while still providing alerts from airborne ADS-B
equipped aircraft.
When in the airport environment alerting envelope, aural traffic alerts are shortened to
"Traffic." Bearing, distance, and relative altitude information is omitted. There are no
traffic alerts when groundspeed is less than 10 knots and within 50 feet of the ground.
4.2.1
On Scene Mode
On Scene Mode is pilot selectable. It changes traffic alerting volumes for other ADS-B
equipped rotorcraft traffic. This allows helicopters to operate in closer proximity to each
other without excessive nuisance alerts. The pilot must manually select the on and off
mode for On Scene Mode. For information about controls and indications refer to the
display's pilot guide.
4-2
GTX 335/345 Pilot's Guide
190-01499-00 Rev. C