Pilot's Guide

13190-00587-02 Rev. B
Garmin GTS Traffic Systems
choosing the sensitivity level is based on available system inputs. If none of the
inputs described below are available, the system will always remain in the most
sensitive level, SL B.
Radar Altimeter
If the aircraft is equipped with a radar altimeter, SL A will be used when the
radar altitude is less than 2,000 feet. SL B will be used when the radar altitude
is greater than 2,000 feet.
Landing Gear Position
If the aircraft has retractable landing gear, SL A will be used when the landing
gear is extended. SL B will be used when the landing gear is retracted. Landing
gear position does not affect sensitivity level if a radar altimeter is available.
Groundspeed
GPS groundspeed may be used to select the sensitivity level only if radar
altimeter and landing gear position is not available. SL A will be used when the
groundspeed is less than 120 knots. SL B will be used when the groundspeed is
greater than 120 knots.
No Available Inputs
If none of the above inputs is available (radar altimeter, landing gear position,
or groundspeed), the system will always remain in the most sensitive level, SL B.
TA Criteria
Targets may become a TA based on closure rate (time until collision) or if they
encroach within a minimum distance. The criteria used depend on the current
sensitivity level and whether the target has altitude reporting capability. Once a
TA is generated, it will remain a TA for at least 8 seconds, even if the target no
longer satisfies the criteria for a TA. The following table summarizes the criteria
used for TAs.