Garmin G1000 NAV III Line Maintenance Manual page 172

4. If the aural alert is not heard, but pre-flight testing passed, engage the autopilot by pressing the
AP key and disengage the autopilot by pressing the AP key again. Visual and aural disconnect
alerting should clear. If no alert is heard, check the GIA/GMA audio interface.
4.10.2.2 AFCS Switch Checks
To verify the AFCS systems buttons and switches are operating correctly, perform the following checks:
1. Actuate both halves of the Manual Electric Trim (MET) switch on the same direction. The trim
clutch should engage and the trim wheel should run on the selected direction. Check operation in
both directions.
2. Press the AP DISC button and hold while actuating the MET switch. The trim wheel should stop
running.
3. Release the AP DISC button. The trim wheel should resume running.
4. Release the MET switch.
5. Engage the autopilot by pressing the AP key.
6. Press and hold the left half of the MET switch. The autopilot should command a normal
disengagement and the trim wheel should stop moving and rotate freely when moved manually.
A single disconnect tone will be heard and a flashing amber "AP" and "YD" will be visible on the
PFD.
7. Engage the autopilot again by pressing the AP key on the MFD. The pitch and roll clutches
should engage, resisting movement of the control wheel.
8. Press and hold the CWS switch. "CWS" will be annunciated in white on the PFD and the control
wheel should now move freely when moved manually.
9. Release the CWS switch. The "CWS" annunciation will be replaced by a green "AP." The
autopilot should hold the control wheel in its present attitude.
10. Press the AP DISC switch. The autopilot should command a normal disengagement. A single
disconnect tone will be heard and a flashing amber "AP" will be visible on the PFD.
11. Verify the control yoke is free in pitch and roll axes.
12. Engage the autopilot again by pressing the AP key.
13. Pull the AP SERVOS circuit breaker. The autopilot should command an abnormal disconnect,
consisting of a continuous disconnect tone and a flashing red "AP" and amber "YD"
annunciation.
14. Press the AP DISC button to silence the autopilot abnormal disconnect tone.
15. Reset the AP SERVOS breaker.
16. Wait for the pre-flight test sequence to successfully complete again.
17. Press the TO/GA button. "TO" should be annunciated on the PFD for both pitch and roll modes
and the command bars should indicate a wings-level climb to 10 degrees.
18. Press the FD key twice to deactivate the Go Around mode and reset the flight director. Green
"PIT" and "ROL" annunciations and the flight director command bars will be visible on the PFD.
19. Center the trim wheel if it is not already centered.
20. Press the AP key to engage the autopilot.
21. Press the CWS button and verify there is no residual force on the control wheel for the pitch axis.
22. Disengage the autopilot by pressing the AP DISC switch.
Page 4-46
Rev. L
G1000 Nav III Line Maintenance Manual
190-00352-00