Garmin G1000 Nxi System Maintenance Manual page 398

AFCS Switch Checks
Verify that the AFCS system buttons and switches are operating correctly by performing the
following:
1. Actuate both sections of the PITCH TRIM (NOSE UP/NOSE DN) switch to activate
Manual Electric Pitch Trim (MEPT). Verify the trim clutch engages and the trim wheel
drives in the requested direction. Check operation in both the up and down direction.
2. Press the AP/YD DISC TRIM INTRPT switch and hold while actuating the manual
electric trim switch. Verify trim does not run and the trim wheel rotates freely when
moved manually. Release the AP/YD DISC TRIM INTRPT button and PITCH TRIM
switch.
3. Engage the autopilot by pressing the AP key on AFCS mode controller. Press and hold
the left section of the manual electric trim switch. Verify the Autopilot disengages
normally with an aural alert and the trim wheel rotates freely when moved manually.
4. Engage the autopilot again by pressing the AP key on the AFCS mode controller. Verify
the pitch and roll clutches engage and resist movement of the control wheel. Press and
hold the CWS switch and verify the control wheel moves freely when moved manually.
Verify the green 'AP' at the top of PFD 1 and PFD 2 is replaced by a white 'CWS'.
5. Release the CWS switch and press the 'XFR' key on the AFCS mode controller. Verify
the clutches are engaged and resist movement of the control wheel. Press and hold the
CWS switch and verify the control wheel moves freely when moved manually. Verify the
green 'AP' at the top of PFD 1 and PFD 2 is replaced by a white 'CWS'.
6. Release the CWS switch and press the AP/YD DISC TRIM INTRPT switch on the pilots
control wheel. Verify the autopilot disengages with a flashing amber 'AP' annunciation
on PFD 1 and PFD 2, accompanied by an aural alert. Verify that the control wheel is
free in pitch and roll axes.
7. Engage the autopilot again by pressing the 'AP' key on the AFCS mode controller.
Open AFCS SERVOS circuit breaker. Verify the autopilot disconnects and the abnormal
disconnect is provided, consisting of a continuous aural alert and a flashing red/white
'AP' annunciation. Verify no AFCS annunciations (e.g. AFCS, PFT, Mistrim) remain on
PFD 1 or PFD 2. Press the AP/YD DISC TRIM INTRPT switch to cancel the abnormal
alert. Close the AFCS SERVOS circuit breaker to restore power to the system and wait
for completion of the pre-flight test sequence.
8. Engage the autopilot again by pressing the 'AP' key on the AFCS mode controller.
Ensure the autopilot is coupled to GIA 1 by verifying the arrowhead next to the 'XFR' key
on the AFCS mode controller is pointing to the pilot's side. If the arrowhead points to the
copilot's side, press the 'XFR' key. Open GIA 1 primary and secondary circuit breakers.
Verify the autopilot disconnects with a continuous aural alert and a flashing red/white
'AP' annunciation. Press the AP/YD DISC TRIM INTRPT switch to cancel the alert and
annunciation. Close the GIA1 primary and secondary circuit breakers and wait for
completion of the pre-flight test sequence.
9. Press the 'XFR' key on the AFCS mode controller and engage the autopilot by pressing
the 'AP' key on the AFCS Mode Controller. Press the AP/YD DISC TRIM INTRPT
switch on the pilot side to disconnect the autopilot; verify the flashing amber 'AP' alert is
displayed on PFD 1 and PFD 2.
10. Press the GO AROUND button on the left throttle. Verify 'TO' is annunciated on PFD 1
and PFD 2 for both PITCH and ROLL modes and the command bars should be at 10
degrees nose up and wings-level.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 385
Revision 1