Garmin G1000 Maintenance Manual page 138

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• 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. One the MFD, select the fourth AUX page.
11. Under the COM CONFIG field, change the COM channel spacing from 25 kHz to 8.33 kHz.
12. Go back to the third AUX page.
13. Select 121.185 MHz on the No. 1 COM transceiver (GIA1).
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 while monitoring the GPS 2 (GIA2) signal levels on the MFD.
17. Repeat steps 14 through 16 for each of the following frequencies:
• 121.190 MHz
• 130.285 MHz
• 131.290 MHz
18. Repeat steps 14 through 17 for the No. 2 COM transceiver (GIA2).
19. On the MFD, select the fourth AUX page and change the COM channel spacing back to
25kHz.
VOR/LOC/GS Test
Check the VOR, ILS, and Glideslope functions with ramp test equipment. Operate the
equipment according to the test equipment manufacturer's instructions. Adjust the RF signal to
a level adequate to perform the test. Note that the PFD CDI will not show a course deviation
bar unless a valid VHF NAV frequency is tuned. Simulate a VOR signal on radial 000° with a
course-width of 20°. Verify full-scale deflection of the CDI while applying a 10° deviation signal.
Exercise the CDI with both right and left deviations for both NAV 1 and 2. Exercise the
Glideslope indicator with up and down deviation indications.
Page 7-12
Rev. B
G1000 System Maintenance Manual
190-00907-00