Garmin GNC 420 Pilot's Manual Addendum - Page 9

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Garmin GNC 420 Pilot's Manual Addendum
equipped) indicates own altitude is less than 2000 feet AGL. If no radar altimeter is
present, Sensitivity Level A is active when the landing gear is extended. Level A is also
active when groundspeed is less than 120 knots with no radar altimeter present in a
fixed gear aircraft. In all other conditions, Level B (greater sensitivity) TA sensitivity is
used to assess TA threats.
Intruder
Sensitivity
Altitude
Level
Available
A
A
B
B
Target altitude relative to own aircraft altitude (relative altitude) is displayed (in
hundreds of feet) for each target symbol (Figure 1). If traffic is above own aircraft
altitude the relative altitude is shown above the target next to a '+' symbol. If traffic
is below own aircraft altitude the relative altitude is shown below the target next to a
'-' symbol.
Altitude trend (Figure 1) is displayed as an up arrow (≥ +500 fpm), down arrow
(≤ -500 fpm), or no symbol if less than 500 fpm rate in either direction.
190-00140-78 Rev. A
Intruder closing rate provides less than 20 seconds of
vertical and horizontal separation.
Yes
Or:
Intruder range is within 0.2 nm and vertical separation is
within 600 feet.
No
Intruder closing rate is less than 15 seconds.
Intruder closing rate provides less than 30 seconds of
vertical and horizontal separation.
Yes
Or:
Intruder range is within 0.55 nm and vertical separation is
within 800 feet.
No
Intruder closing rate is less than 20 seconds.
Table 2 TA Sensitivity Level and TA Alerting Criteria
Traffic
Type
Figure 1 Traffic Symbol Components
400/500 Pilot's Guide Addendum for GTS 8XX Interface
GTS 8XX Interface
TA Alerting Conditions
Relative
Altitude
Altitude
Trend
3