Garmin G1000 Nxi System Maintenance Manual page 378

Antenna Test
The following test assures the antennas and coaxial cables are properly connected.
1. On the Map – Traffic Map page of the MFD, perform the following:
a. Press the TAS OPER softkey (for TAS/TCAS I) or press TA Only softkey (for
TCAS II). 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 TAS/TCAS I) or
TA ONLY (for TCAS II) without indicating a fault, proceed to the next step of
antenna verification.
b. If an "ADS-B" softkey is displayed, press the softkey to turn it off.
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) relative to the aircraft 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.
3. Set up a stationary intruder by selecting the following on the ramp tester:
•
Intruder type: ATCRBS
•
Intruder Start Distance: 2 nm
•
Intruder Start Altitude: 500 feet above field elevation
•
Vertical Speed: 0 fpm
•
Velocity: 0 kts (on some ramp testers, a velocity greater than 0 kts is required and
a stationary intruder is created by not starting the scenario.)
4. Position ramp tester at 0 degrees (i.e. off the nose of the aircraft).
5. Initiate the intruder scenario and verify a target is annunciated on the Map – Traffic Map
page of the MFD at the correct bearing of approximately 0 degree at 2 NM (read as +05
above a filled diamond indicating proximate traffic).
6. On the ramp tester, toggle intruder traffic to standby or off.
7. Reposition ramp tester and reengage the same intruder scenario for 90, 180 and 270
degrees relative to the aircraft.
8. Verify a target is annunciated on the Map – Traffic Map page of the MFD at the same
bearing as the ramp tester.
9. If the bearing is not as anticipated or multiple targets (not including possible local traffic)
are displayed during tests, verify the following:
•
Coax cable connectors are properly secured at the bulkhead adapter fittings,
GA58 antennas, GTS unit and GPA 65 unit (if installed).
•
Connections are made to the proper channels and color-coded heat shrink is the
same color on both ends of coax cables.
•
Connectors are correctly installed on coax cables.
10. If no other service is to be performed, continue to the return-to-service checks in Section
9.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 365
Revision 1