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DYNAMIC SHIELD (Models 9900A and 9900B)
If the host aircraft climbs (or descends) more than 800 feet
per minute, traffic 500 feet above (or below) the boundary
of the selected shield will be displayed. Alert tones will not
be issued until the TCAD detects shield penetration. This
gives the pilot awareness of traffic beyond the selected
shield that may become a threat.
HIGH DENSITY OPERATION
For best operation in high-density areas, make the Air
Traffic Shield as small as practicable. By reducing the
shield size, detected signals will represent imminent
potential threats, not extraneous information.
DATA
The DATA button displays the MSL altitude (or Flight
Level) of traffic. The Mode A squawk will also be shown, if
available. The squawk helps to determine if the traffic is
VFR, IFR, or VFR handled by ATC. To get the correct
MSL altitude, the altimeter setting in the TCAD must be
correct. Transponder code and altitude are available for
primary, secondary, and third level threats.
The Mode A code of the threat aircraft is not always
available because of matching and interrogator limitations.
This does not compromise the collision-alert function or
indicate degraded operation. If the squawk is not available,
TCAD displays “Mode A/C”, or “Mode A” as appropriate.
U.S. registered Mode S traffic will display the N-number
instead of the Mode A code. This is helpful when the traffic
is also on the ATC frequency. The N-number makes it
possible to anticipate a potentially conflicting vector.
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