Rev E TR-220 90 008 088-1
2-29
2.15 TCAS Tests
The TR-220 Multifunction Test Set is capable of fully testing ATCRBS and Mode S, ACAS, TCAS
I, and II systems (Traffic Alert and Collision Avoidance System). The operator is able to manually
select a scenario or utilize the default scenario already preprogrammed in the Test Set Memory.
When properly used, the Test Set will simulate an Intruder Aircraft converging on the position of
the UUT. The operator may then observe the TCAS display to ensure the correct TA’s (Traffic
Advisory) and RA’s (Resolution Advisory) occur on their display.
The Simulation is used with the Directional Antenna. This gives the operator the ability to move
the Test Set to different locations and headings from the UUT.
2.15.1 Typical TCAS Concepts
NOTE
TCAS is a system, which provides situational awareness of the surrounding airspace of
an aircraft to the pilot and crew. A TCAS establishes a volume of airspace around the
aircraft. The size of the airspace is based on range, speed and altitude. By working in-
conjunction with the aircraft Transponder system, the TCAS can determine the relative
threat of an aircraft, issue visual and audible advisories to assist the crew in locating
and/or take action to prevent a collision.
The perimeter of the CAUTION AREA is approximately 20 to 48 seconds to the time the
intruder would enter the WARNING AREA. Refer to Figure 2-9.
Caution, Warning, and Collision Areas for a TCAS I System
Figure 2-9
All illustrations shown are for demonstration purposes. Though the test
results may be typical, they are not meant to replace FAA guidelines and
manufacturer recommendations.
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