System Maintenance Manual
G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 4-29
190-00682-01 Revision F
(B) AHRS and ADC data path check
1. Verify there are no AHRS loss-of-data messages, such as:
• AHRS not receiving any GPS information
• AHRS not receiving backup GPS information
• AHRS using backup GPS source
2. Place the G1000 in configuration mode.
3. In the GIA page group, go to the GIA RS-232/ARINC 429 CONFIG page.
4. With GIA1 selected in the SELECT UNIT window, verify the RS232 Channel 1
(GDC74 #1) and RS232 Channel 6 (GRS77 #1) show valid indicators. Ref. Section 5.2.1.2.
5. With GIA1 selected in the SELECT UNIT window, verify the ARINC 429 IN5
(GDC74 #1) and ARINC 429 IN6 (GRS77 #1) show valid indicators. Ref. Section 5.2.1.2.
6. With GIA2 selected in the SELECT UNIT window, verify the RS232 Channel 1
(GDC74 #2) and RS232 Channel 6 (GRS77 #2) show valid indicators. Ref. Section 5.2.1.2.
7. With GIA2 selected in the SELECT UNIT window, verify the ARINC 429 IN5
(GDC74 #2) and ARINC 429 IN6 (GRS77 #2) show valid indicators. Ref. Section 5.2.1.2.
8. In the PFD page group, go to the GIA RS-232/ARINC 429 CONFIG page.
9. With PFD1 selected in the SELECT UNIT window, verify the ARINC 429 IN1
(GRS77 #1) and ARINC 429 IN2 (GDC74 #1) show valid indicators. Ref. Section 5.2.1.1.
10. With PFD2 selected in the SELECT UNIT window, verify the ARINC 429 IN1
(GRS77 #2) and ARINC 429 IN2 (GDC74 #2) show valid indicators. Ref. Section 5.2.1.1.
(C) PFD and MFD Ethernet connection check (includes ARINC connection check between ADC1
and MFD and between GRS1 and MFD, and the DISPLAY BACKUP button check)
1. Re-start PFD 2, PFD 1 and MFD in normal mode.
2. On the right hand circuit breaker panel, open the
MFD circuit breaker:
3. Verify NAV 1, COM 1, NAV 2 and COM 2 remain valid on both PFD 1 and PFD 2.
4. Close the MFD circuit breaker and wait for MFD to initialize:
5. Open the PFD 2 circuit breaker:
6. Press the DISPLAY BACK UP button on the Pilot’s GMA 1347D audio panel.
7. Verify NAV 2 and COM 2 are each replaced by a red X and NAV 1 and COM 1 remain
valid on both the MFD and PFD 1.
8. Press the DISPLAY BACK UP button on the Pilot’s GMA 1347D audio panel to return to
normal mode.
9. Close the PFD 2 circuit breaker and wait for PFD 2 to initialize:
10. Open the PFD 1 (PRI) and PFD 1 (SEC) circuit breakers:
11. Press the DISPLAY BACK UP button on the Co-pilot’s GMA 1347D audio panel.
12. Verify NAV 1 and COM 1 are each replaced by a red X and NAV 2 and COM 2 remain
valid on both the MFD and PFD 2.
13. Press the DISPLAY BACK UP button on the Co-pilot’s GMA 1347D audio panel to return
to normal mode.
14. Close the PFD 1 (PRI) and PFD 1 (SEC) circuit breakers and wait for PFD 1 to initialize: