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UNDERSTANDING PCAS16
Traffic Advisories and Alerts
There is a difference between traffic detection, as defined in the previous section, and traffic alerts (threats). XRX will
not alert you to traffic that does not fall within your specified threat detection envelope, regardless of whether an
indication of traffic appears in the display window.
XRX incorporates both voice announcements through the headset, a high-volume tone generator, and quick display
flash to alert you of an impending threat. Two levels of threats are given: traffic advisories and traffic alerts.
The points at which traffic
advisories and traffic alerts are
given depend on the range to
target and if the aircraft if
converging with you or not.
The threshold within which
threats are considered is
determined by the range
setting, as shown in the table
below. Overall, when the
detection window is
decreased in size by scaling
down the range and altitude,
the alert thresholds are
reduced as well.
Table D: Advisory and Alert Thresholds. Please note the following:
> In a case where Altitude is set to ±500 ft and Range is set to 6 or 3 NM, no Traffic Advisories would be given.
Because the threshold for these Range settings is greater than 500 ft., the system would “skip over” the Advisory
and give an Alert warning.
> Each of the top three traffic threats are evaluated independently against the Traffic Advisory and Traffic Threat
criteria indicated in the table above. This means that an advisory or alert may be given for an aircraft not in the
primary traffic location if it falls within the threshold(s).
Detection Window
Traffic Advisory
Traffic Alert
RANGE
ALTITUDE
Level Audio Range Setting
Converging Traffic is
within Range...
...and Relative Altitude is
less than...
Advisory
Headset: “Traffic
advisory. Monitor
Closure Rate”
Beeps: 2
6 NM 2.0 NM ±1000 ft.
3 NM 1.0 NM ±1000 ft.
1 NM 0.6 NM ±500 ft.
Alert
Headset: “Traffic
alert. Obtain visual
contact.”
Beeps: 4
6 NM 0.7 NM ±700 ft.
3 NM 0.6 NM ±600 ft.
1 NM 0 3 NM ±500 ft.
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