Gts Traffic System Functional Check; Figure 7-15, Gts 8Xx Gnd Test Softkey - Garmin G1000 System Maintenance Manual

7.27

GTS Traffic System Functional Check

This section is applicable to the GTS 820/825 (TAS), GTS 850/855 (TCAS I), and GTS 8000 (TCAS II)
traffic systems. Perform the following tests to verify GTS 820/850 or GTS Processor operational and
surveillance functions. Use a ramp tester such as a TIC TR220 or equivalent to perform the tests.
To perform these tests for the GTS 820/825/850/855 (GTS 8XX) traffic systems,, the aircraft must be on
the ground, the Radar Altimeter circuit breaker (if installed) must be opened prior to GTS 8XX unit power
on, remain open throughout testing, and the GTS XXX must be in Ground Test mode. For those tests with
the GTS 8000 TCAS II configuration, the Radar Altimeter circuit breaker (if installed) must be engaged
throughout these tests. On the MAP-TRAFFIC MAP page of the MFD, press the softkey sequence: 3, 4,
4, 3. The GND TEST softkey will appear. Press the GND TEST softkey to activate Ground Test mode.
This simulates the GTS 8XX to be airborne at 50,000 feet with a magnetic heading of 0 degrees. To exit
the Ground Test mode, press the GND TEST softkey again.
To perform these tests for the GTS 8000 traffic system, the aircraft must be in a simulated 'in-air'
condition. To accomplish this, place the aircraft on jacks or actuate the weight on wheels switches on
both L/H and R/H main landing gear.
7.27.1 Antenna Verification
The following test assures the antennas and coaxial cables are properly connected. The GTS 8XX must be
in Ground Test mode.
1. On the MAP-TRAFFIC MAP page of the MFD, press the OPERATE softkey (for GTS 8XX) or
press TA ONLY softkey (for GTS 8000). A self test of the antenna circuit is initialized. If the
MFD displays FAILURE at the upper left corner of the traffic display area, it will be necessary to
recheck the coaxial connections. If MFD displays OPERATE (for GTS 8XX) or TA ONLY (for
GTS 8000) without indicating a fault, proceed to the next step of antenna verification.
2. Ensure that the transmitter or receiver (TX/RX) that you are testing is significantly closer to the
ramp tester than another operating RX/TX, or erroneous and inaccurate results may occur. All
four quadrants (0, 90, 180 and 270 degrees) will be similarly tested to verify bearing of simulated
intruder supplied via the ramp tester are correctly displayed on the MAP-TRAFFIC MAP page of
the MFD.
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01

Figure 7-15, GTS 8XX GND TEST softkey

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Revision 4