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SECTION IX
OPERATING TIPS
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SCANNING
To optimize use of the data provided by TCAD, the pilot
should consider where the greatest potential for collision is,
and how to best find the traffic.
If the threat aircraft is well above or below your airplane, no
action may be necessary on your part to avoid the threat and
the traffic can be located if desired.
CAUTION: Because of encoder variations, any threat
within 300 feet of your altitude should be considered at your
altitude.
For threats detected at or near your altitude, first scan ahead
of the aircraft, then expand the scan to the left and right. By
maintaining adequate vertical separation, traffic can always
be avoided.
Most flight hours are flown by Mode C equipped aircraft.
Replies received from non-Mode C aircraft will cause NO
ALT to be displayed on TCAD, with the iNM. The pilot
must analyze this traffic without knowing the altitude
difference. Since TCAD range indications are based from
your aircraft, some altitude information is available from
non-mode C traffic. For example, non-mode C traffic 6,000
feet directly above your aircraft will likely never show
closer than 1 iNM.
Appendix 3 contains excerpts from AC 90-48C, Pilot's Role
in Collision Avoidance, which provides additional tips on
visual scanning.
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