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MULTIPLE THREATS
TCAD can monitor more than 50 aircraft at one time, and
displays up to three. When a second (or third) threat is
detected in the monitored area, one (or two) small airplane
symbols appear in the right display window. Data on
second and third threats can be momentarily displayed by
pressing the s button or t button adjacent to the aircraft
symbols (See Section IX, Operating Tips).
If the first and second threats are above the host aircraft,
both threats can be avoided by descending. Similarly, if
both are below the host aircraft, the threats can be avoided
by ascending. If the primary threat is above the aircraft and
the second threat is below the aircraft (or vice versa), and
are within 500 feet of the host, avoiding one could position
the other threat closer to the host airplane. If this situation
exists, and the detected aircraft are within 1 iNM, the small
airplane symbol will flash, indicating a need to view the
secondary display before deciding on a course of action.
Generally, the shield size should be reduced when three
threats are detected within the monitored area.
MODE A IMAGES
The Ryan TCAD processing function decodes and pairs
Mode A and C replies from threat aircraft, and sends the
data on to be prioritized and displayed. A few ATC
assigned Mode A codes are identical to Mode C codes,
making it difficult for the processor to determine which of
the A/C pair is the Mode A and which is the Mode C. In
this case, both combinations are prioritized and displayed.
If the threat aircraft or Mode A image is within the shield, it
will be displayed. In the unlikely event that both the Mode
A image and the threat are detected inside the monitored
area, the combination is treated as a multiple threat.
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