G1000 Miscompare Checks - Garmin G1000 Nxi System Maintenance Manual

29. Reposition the rudder pedals to the neutral position.
30. Begin to apply pressure slowly to the left rudder pedal. When pedal resistance is felt,
continue to apply pressure slowly for approximately 20 to 30 seconds.
31. Verify that the amber RUD→ annunciator is displayed on both PFD 1 and PFD 2.
32. Reposition the rudder pedals to the neutral position.
33. Disengage yaw damper.
34. The Trim Annunciator Check is complete.

G1000 Miscompare Checks

This procedure will check the AHRS, airspeed and altitude miscompare monitors. Accomplish
the following checks with the aircraft positioned where it can receive GPS signals and magnetic
heading. Access to AHRS 1/ADAHRS 1 and AHRS 2/ADAHRS 2 is required during this test.
1. Unfasten the AHRS 1/ADAHRS 1 and 2 units and set loose in their racks. Do not
disconnect connectors or pitot/static lines.
2. Connect a pitot/static test set to the aircraft left side pitot and static ports (pilot's side).
Do not connect a pitot/static test set to the right side pitot/static ports (copilot's side) at
this time.
3. Ensure the G1000 is operating in normal mode.
4. Set the baro-correction on PFD 1 and PFD 2 to STD.
5. On the AFCS mode controller, press the ALT, HDG, and AP buttons and verify autopilot
engages.
6. Slowly increase the altitude to simulate an altitude miscompare of greater than 200 ft.
Verify PFD 2 altitude does not increase, autopilot does not disconnect, and an amber
ALT box is displayed in the altitude tape of PFD 1 and PFD 2.
7. Reduce left side altitude to ambient pressure. Verify the amber ALT box is removed
from both PFD(s).
8. Repeat Steps 6 and 7 except reducing the altitude to simulate a miscompare greater
than 200ft.
9. Connect a pitot/static test set to the right side pitot and static ports (copilot's side).
10. Use the pitot/static test set to simulate an airspeed of 85 kts for the left (pilot's) side and
95 kts for the right (copilot's) side. Verify the autopilot does not disconnect and an
amber IAS box is displayed on the airspeed tape of PFD 1 and PFD 2.
11. Use the pitot/static test set to simulate an airspeed of 95 kts for the left (pilot's) side and
85 kts for the right (copilot's) side. Verify the autopilot does not disconnect and amber
IAS box is displayed on the airspeed tape of PFD 1 and PFD 2.
12. Reduce the airspeeds to 0 kts.
13. Slowly rotate AHRS 1/ADAHRS 1 along the lateral (pitch) axis to a pitch attitude of
greater than 5 degrees, verify the following:
•
PFD 2 pitch attitude does not change
•
An amber PIT box is annunciated on PFD1 and PFD2 adjacent to the pitch
scale.
•
Autopilot disconnects at approximately 5° miscompare
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 130
Revision 1