Pilot's Guide

16
Garmin GTS Traffic Systems
190-00587-02 Rev. B
TA Aural Muting
TA aural alerts may be muted or canceled under some circumstances. Muting
or canceling of the TA aural alert does not affect the visual display of the TA.
Radar Altimeter
If the aircraft is equipped with a radar altimeter, all TA aural alerts will be
muted when the radar altitude is less than 400 feet.
Landing Gear Position
If the aircraft has retractable landing gear, all TA aural alerts will be muted
when the landing gear is extended. Landing gear position does not mute TA
aural alerts if a radar altimeter is available.
TAWS/Windshear Alerts
TA aural alerts may be temporarily muted by higher-priority aural alerts,
such as TAWS or windshear. The TA aural alert will resume when the higher-
priority aural alert is no longer active.
External Switch
A TA aural alert may be canceled with an optional momentary pushbutton
switch. Pressing this switch during a TA aural alert will cancel/mute that aural
alert. Subsequent TA aural alerts will be played, and the switch must be pressed
each time that it is desired to cancel/mute a TA aural alert.
Ownship Air/Ground Detection
Optional external interfaces can be used to determine whether the ownship
is on the ground or in the air. Interfaces that may be used for determining the
air/ground state include:
• An air/ground switch (e.g. squat or airspeed switch).
• GPS groundspeed. Greater than 35 knots indicates in air, and less than
30 knots indicates on ground.
• Air/ground Ethernet message from a Garmin avionics system.
Ownship air/ground detection is used for the automatic mode switching and
calculated height above ground features.