Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 4-25
190-00716-01 Revision 4
• AHRS1 is using backup GPS source.
• AHRS2 not receiving backup GPS Information.
• An amber BOTH ON GPS2 is displayed on PFD 1 and PFD 2.
• AHRS and ADC data remain valid on PFD 1 and PFD 2.
3. Close the GIA1 (PRI) and GIA1 (SEC) circuit breakers. Allow system to re-acquire satellites and
return to normal display modes.
4. Open GIA2 CB.
5. Verify the following:
• NAV2 and COMM2 tuning fields on PFD 1 and PFD 2 are invalid (red X).
• L/R engine data remains valid.
• XPDR2 is Inoperative.
• GMA2 Is Inoperative.
• AHRS2 is using backup GPS source.
• AHRS1 not receiving backup GPS Information.
• An amber BOTH ON GPS1 is displayed on PFD 1 and PFD 2.
• AHRS and ADC data remain valid on PFD 1 and PFD 2.
6. Close GIA2 CB. Allow system to re-acquire satellites and return to normal display modes.
7. Open GIA1 primary and secondary CBs and GIA2 CB.
8. Verify the following:
• COM1/NAV1 & COM2/NAV2 fields flag invalid.
• GPS CDI flags LOI on PFD.
• NAV1 & NAV2 CDI loses deviation bar.
• XPDR field flags invalid on PFD.
• Engine Instrument field flags invalid on MFD.
• All AHRS & ADC fields remain valid.
• Red AFCS status annunciation given.
• If equipped with TAWS, TAWS FAIL annunciation given.
• If equipped with ADF and/or DME, ADF/DME windows flag invalid.
9. Restore power to both GIA units.
The G1000 Redundant Connections Check is complete.