Garmin G1000 Nxi System Maintenance Manual page 290

The GIA 63W units should normally acquire a GPS navigation solution within 5 to 10 minutes of
startup, provided the aircraft is outside (or indoors with a GPS repeater). Select the Aux – GPS
Status page on the MFD. Two softkeys on the bottom of the display allow the user to toggle
between GPS 1 and GPS 2. Verify that both receivers show 3D DIFF NAV on the MFD.
It may be necessary to temporarily disable or move away from GPS repeaters
while testing, as repeaters may adversely affect GPS receiver performance.
VHF COM Interference Test
This test must be conducted outside. Use of a GPS repeater inside a hangar may result in a
failed test. This procedure assumes that the system is currently set to 25 kHz COM channel
spacing. Once the signal acquisition test has been completed successfully, perform the
following steps:
1. On the MFD, monitor GPS signal strength bars on the Aux – GPS Status page.
2. On the PFD, ensure that the CDI is set to GPS. If it is not, press the 'CDI' softkey until
GPS ENR is displayed.
3. Verify that the GPS "INTEG" flag is out of view.
4. Select 121.150 MHz on the No. 1 COM transceiver.
5. Transmit for a period of 35 seconds while monitoring GPS 1 signal strength levels.
6. During the transmit period, verify that the GPS "INTEG" flag does not come into view on
the PFD and verify that GPS 1 does not lose a 3-D navigation solution on the MFD.
7. Repeat steps 5 and 6 and re-transmit while monitoring GPS 2 signal levels on the MFD.
8. Repeat steps 4 through 7 for each of the following frequencies:
•
121.175 MHz
•
121.200 MHz
•
131.250 MHz
•
131.275 MHz
•
131.300 MHz
9. Repeat steps 4 through 8 for the No. 2 COM transceiver (GIA2).
10. On the MFD, select the Aux – System Setup page.
11. Under the COM CONFIG field, change the COM channel spacing from 25 kHz to 8.33
kHz.
12. Go back to the Aux – GPS Status page.
13. Select 121.185 MHz on the No. 1 COM transceiver.
14. Transmit for a period of 35 seconds while monitoring GPS 1 signal strength levels.
15. During the transmit period, verify that the GPS "INTEG" flag does not come into view on
the PFD and verify that GPS 1 does not lose a 3-D navigation solution on the MFD.
16. Repeat steps 14 and 15 and re-transmit while monitoring GPS 2 signal levels on the
MFD.
17. Repeat steps 14 through 16 for each of the following frequencies:
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 277
Revision 1