System Maintenance Manual

Page 4-34 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision F 190-00682-01
22. Engage the autopilot, apply firm right load on the control yoke for approximately 10
seconds. Verify that the amber AIL → annunciator is displayed on both PFD 1 and PFD 2.
23. Disengage the autopilot and rotate the control yoke to the full right position and hold.
24. Engage the autopilot, apply firm left load on the control yoke for approximately 10 seconds.
Verify that the amber ← AIL annunciator is displayed on both PFD 1 and PFD 2.
25. Disengage the autopilot.
26. Engage the autopilot, apply firm load on the right rudder pedal for approximately 15
seconds. Verify that the amber ← RUD annunciator is displayed on both PFD 1 and PFD
2.
27. Disengage the autopilot.
28. Engage the autopilot, apply firm load on the left rudder pedal for approximately 15 seconds.
Verify that the amber RUD → annunciator is displayed on both PFD 1 and PFD 2.
29. The Trim Annunciator Check is complete.
4.13 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 AHRS1 and AHRS2 will be required during this test.
1. Ensure the G1000 is operating in normal mode.
2. Connect a pitot/static test set to the aircraft ADC1 pitot and static ports (Pilot’s side). (Do
not connect the pitot/static tester to ADC2 ports at this time)
3. Set the baro-correction on PFD1 and PFD2 to 29.92in/hg.
4. On the AFCS mode controller, press the AP button and verify autopilot engages.
5. Slowly increase the pitot/static test set to simulate an ADC1 / ADC2 altitude miscompare of
greater than 200 ft., verify ADC2 altitude does not increase, autopilot does not disconnect
and amber comparator window text “ALT MISCOMP” is displayed on PFD1 and PFD2.
6. Reduce ADC1 altitude to ambient pressure.
7. Repeat Step 5 with the pitot/static test set connected to the aircraft ADC2 pitot and static
ports.
8. Use the pitot/static test set to simulate an airspeed of 40 kts for ADC1 and 55 kts for ADC2.
Verify the autopilot does not disconnect and amber comparator window text
“IAS MISCOMP” is displayed on PFD 1 and PFD2.
9. Use the pitot/static test set to simulate an airspeed of 55 kts for ADC1 and 40 kts for ADC2.
Verify the autopilot does not disconnect and amber comparator window text
“IAS MISCOMP” is displayed on PFD 1 and PFD2.
10. Use the pitot/static test set to simulate an airspeed of 85 kts for ADC1 and 95 kts for ADC2.
Verify the autopilot does not disconnect and amber comparator window text
“IAS MISCOMP” is displayed on PFD 1 and PFD2.
11. Use the pitot/static test set to simulate an airspeed of 95 kts for ADC1 and 85 kts for ADC2.
Verify the autopilot does not disconnect and amber comparator window text
“IAS MISCOMP” is displayed on PFD 1 and PFD2.
12. Reduce ADC1 and ADC2 airspeeds to 0 kts.
13. Slowly rotate AHRS1 along the lateral (pitch) axis to a pitch attitude of greater than 5
degrees, verify the following: