190-00734-22 Rev. 2 Page 17 of 20
7.3 Traffic Sources and Alerting
The GTX 345 is capable of receiving ADS-B, ADS-R, TIS-B, and
TAS/TCAS/TCAD traffic reports. Traffic data from these various sources is
used to track traffic around the rotorcraft and provide display and alerts to the
flight crew to aid in visual acquisition and avoidance. The GTX 335 is capable
of receiving TIS-A traffic only.
Traffic alerting is provided via a visual annunciator and audio callouts.
Rotorcraft which have a Radar Altimeter OR GNS/ GTN display interfaced to
the GTX will truncate traffic aural alerts to not include bearing, distance, and
relative altitude information when less than 200 ft above the surface.
Additionally, the GTX will reduce the protected volume around these rotorcraft
when operating below 200 ft above the surface and less than 60 kts groundspeed
to minimize nuisance alerts in the airport area while still providing traffic alerts
on other eligible ADS-B OUT equipped aircraft.
NOTE
Due to some aircraft not being required to equip for ADS-B
Out, as well as the nature of TIS and its service volumes, not
all traffic will be tracked by the GTX. This is much like an
active traffic system which does not track non-transponder
equipped aircraft. The flight crew must use “see and avoid”
procedures to visually acquire and avoid other aircraft. Do not
rely on your GTX as the sole means of detecting other aircraft.
7.4 Rotorcraft with No Heading Source
Rotorcraft which have an invalid heading source, or do not have a heading
source interfaced to the GTX are subject to the following traffic display
limitations:
• The traffic page on an interfaced display will be oriented to rotorcraft
TRACK, which may or may not align with rotorcraft heading.
• Due to the behavior described above, correlation of TCAS and ADS
traffic will be degraded or impossible. Above 15 knots groundspeed,
TCAS targets which cannot be correlated will be misaligned with ADS
targets by a value equal to the crab angle. When operating with
significant crab angles such as in rearward or sideward flight above 15
knots, the traffic display shall not be used (see Limitations, Section
2.6).