190-00734-11
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Rev. 6
Page 8-6
9. If dual GPS sources are connected to the GTX, repeat steps 5 - 8 for the other GPS source.
10. Revert the GTX squat switch back to its previous configuration as follows.
a. If a connected squat switch was defeated in step 4, then place the connected switch back to the
on-ground position.
b. If the GTX squat switch configuration settings were changed in step 4, revert the GTX settings
back to the previous configuration as documented in the aircraft checkout log.
11. Select STBY mode on the GTX.
If no other service is to be performed, continue to the return-to-service checks in section 9.1.
8.8 GTX 3X5 with TCAS System Test (GX000 Only)
The aircraft TCAS system test must be done with the GTX 3X5 Install Tool. Use a TCAS ramp tester and
these steps to verify the TCAS system operation and surveillance functions correctly.
1. Set the aircraft altimeter to 29.92” to find the local pressure altitude.
2. Connect the GTX 3X5R unit to the GTX 3X5 Installation Tool.
3. Set the TCAS ramp tester to the scenario in table 8-1.
Table 8-1 Ramp Test Pressure Altitude Check Scenario
4. Select the TCAS
Operate
key on the GTX 3X5 Install Tool State page to put the TCAS system
into Operate mode.
5. Start the intruder test scenario on the test set.
6. Make sure the intruder is shown with a relative altitude of “00” (same altitude as ownship) on the
traffic display.
7. Select the TCAS
Standby
key on the GTX 3X5 Install Tool State page to put the TCAS system
into Standby mode.
8. Select the
Disconnect
key on the GTX 3X5 Install Tool State page.
9. Disconnect the GTX 3X5R unit from the GTX 3X5 Install Tool.
If no other service is to be performed, continue to the return-to-service checks in section 9.1.
Intruder Type
Intruder Start
Distance
Intruder Start
Altitude
Vertical Speed
Velocity
ATCRBS
10 NM
Local pressure
altitude
(from step 1)
0 fpm
0 Kts
