Page 3-16
GTS 8XX/GPA 65 Installation Manual
Revision 4TP
190-00587-00
3.5.5
Ramp Test and Return To Service Test
Using a ramp tester, such as a TIC TR220 or equivalent, make the following setup and measurements to
verify GTS 8XX operational and surveillance functional.
To select a scenario that will properly converge and intercept the GTS 8XX, the GTS 8XX must be in
Ground Test mode. To enable Ground Test mode, the aircraft must be on the ground and the GTS 8XX
must be in Normal System mode and in Standby.
Activate ground test mode by clicking ‘Enable’ in the Ground Test field on the Normal tab of the GTS
8XX Install Tool.
Figure 3-8. Ground Test
This simulates the GTS to be airborne at 50,000 ft with magnetic heading of 0°.
NOTE
The GTS 8XX will not accept the Ground Test command unless the unit is in Standby and
the squat switch indicates the aircraft is on the ground.
Position the test set directional antenna with a clear line of sight to the GTS 8XX antenna at 90 degrees.
With the GTS 8XX powered up and in Standby mode indicated on the CDTI, cycle the GTS 800 to
“Operate”.
Select the following scenario:
Set the intruder type as ATCRBS.
Intruder Start Distance Intruder Start Altitude
Vertical Speed
Velocity
10
NM
50,000
ft 0
fpm.
360
Kts
Initiate the intruder scenario and observe the following:
•
Traffic should be acquired at approximately 10 NM at 90 degree bearing and co-altitude.
Observe intruder closes on own aircraft at a rate of .1 NM/sec.
•
The intruder should transition from Other Traffic (displayed as an open diamond with 00
displayed above), to proximate traffic (displayed as a filled white diamond with 00
displayed above), to a Traffic Advisory (TA) alarm.
•
The appropriate TA symbology (yellow filled circle with 00 displayed above, and an audio
annunciation of "Traffic! 3 O'clock! At Altitude! 3 Miles!"), displayed when the
intruder approaches within 3 NM.
