G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
Page 8-11
190-00716-01
Revision 1
8.2.2
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
PFD1 and PFD2 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 PFD1 and
PFD2 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 PFD1 and PFD2,
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 PFD1 or PFD2. 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 GIA1 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 GIA1 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 PFD1 and PFD2.
10.
Press the GO AROUND button on the left throttle. Verify ‘TO’ is annunciated on PFD1 and PFD2
for both PITCH and ROLL modes and the command bars should be at 10 degrees nose up and wings-
level.
11.
Press the Flight Director (FD) key on the AFCS mode controller to deactivate the GA mode. Press
the AP key to engage the autopilot. Press the CWS button for a minimum of 5 seconds and release;
verifying there is no residual force on the control stick for the pitch axis.
Summary of Contents for Cessna Caravan G1000
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