TIC TR-220 - Page 50

Rev E TR-220 90 008 088-1
2-33
When changing the Mode S address, utilize both the CHN/ALT-DIST-VERT
SPEED and the UP/FWD-DOWN/REV switches.
11. Once all parameters have been set, turn the UUT FUNCTION switch to the
TCAS position. The scenario is now held in the Test Set memory.
12. As a convenience, the following describes intruder scenarios and the correct
parameters necessary to ensure a simulated convergence will occur.
The operator is able to select an infinite number of simulated Intruder scenarios.
The TR-220 allows the user to select Intruder Starting Altitude, Vertical Speed,
and Distance from target, and three preset Velocities. Table 2-4 describes each
parameter and limitations.
PARAMETER MIN AND MAX NOTES
Intruder Velocity 120 – 1200 Kts. 10 KT. increments
Intruder Altitude 99,900 to -1000 ft.
50,200 to 99,900 in 100 ft
increments
-9000 to 51,175 ft in 25 ft
increments
Vertical Speed -7,500 to 7,500 fpm. 100 ft. increments
Intruder Distance 0 – 50 nmi. 1 nmi. increments
TCAS Intruder Parameters
Table 2-4
To select a scenario that will properly converge and intercept the UUT, the
Aircraft altitude must be known. If any parameter is incorrectly entered, the
intruder simulation may not intersect the UUT resulting in the operator not
observing the intended display. The operator may utilize a Pitot Static Test Set to
“Pump-Up” the aircraft altitude. It is recommended that this be accomplished
before actual TCAS testing begins.
To correctly enter intruder parameters, utilize the following formula for reliable
test results.
(UUT─ Intruder Altitude) x Velocity
VS = ------------------------------------------------------------
Intruder Distance x 60
Assume the UUT Altitude is Pumped-up to 10,000 ft, Intruder Altitude set for
20,000 ft, Intruder Velocity is 600 kts and Intruder Distance is 20 nmi.
WARNING
Some Mode S Addresses may not be used. Ensure that the code you use
is authorized in the country where the Test Set is being utilized. Tel-
Instrument Corp. initially inserts A00001 for the Mode S Address before
shipping the Test Set.