Garmin G1000 Nxi System Maintenance Manual page 399

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.
12. Disengage the autopilot by pressing the AP/YD DISC TRIM INTRPT switch on the co-
pilot's control wheel. Engage VS mode by pressing the VS key on the AFCS mode
controller. Verify PFD 1 and PFD 2 display 'VS' in green and indicates a pitch reference
of '0 FPM'.
13. Select an altitude using the ALT SEL knob on the AFCS mode controller. Press the FLC
key on the AFCS mode controller and verify that 'FLC' is annunciated on PFD 1 and
PFD 2 in green with a reference of 100 KTS.
14. Press the ALT key on the AFCS mode controller and verify that the 'ALT' annunciation is
displayed in green on PFD 1 and PFD 2 with an altitude reference equal to the aircraft
altitude (within the nearest 20 feet).
15. Press the FD key and verify that the mode annunciations and command bars are
removed from the display.
Autopilot Clutch Overpower Check
The GFC 700 uses electronic torque limiting as well as mechanical slip
clutches to limit the maximum servo effort. When the system is on the ground,
the electronic torque limiting is removed, allowing manual checks of the slip-
clutch settings.
1. Engage the Autopilot by pressing the AP key on the AFCS mode controller.
2. Manually overpower the autopilot clutches in pitch, roll and yaw. If the Autopilot clutches
cannot be overpowered, check the GSM 86 clutch cartridge. Refer to the servo
installation drawing (listed in Table 1-1) as applicable.
3. Actuate and hold PITCH TRIM switch in either the NOSE UP or NOSE DOWN direction
to disconnect the autopilot. While the trim is running, restrain the aircraft pitch trim
wheel and verify that the trim clutch can be overpowered. If it cannot be overpowered,
check the GSM 86 clutch cartridge. Refer to the pitch trim servo installation drawing
listed in Table 1-1.
4. Engage the autopilot by pressing the AP key on the AFCS mode controller. Actuate and
hold the manual electric trim switch in either the up or down direction to disconnect the
autopilot. Verify that the trim wheel moves smoothly in both directions throughout the
entire trim range during manual electric trim operation. If the trim wheel hesitates, this
may indicate that the pitch trim clutch is slipping and proper clutch setting or clutch
cartridge and cable tension should be verified. Refer to the King Air 300 Series
Maintenance Manual and Pitch Trim Servo Install drawing, listed in Table 1-1, for clutch
settings and cable tensions. If both clutch setting and cable tension are within tolerance,
check the aircraft pitch trim system for excessive friction. Refer to the Beechcraft King
Air 300 Series Maintenance Manual listed in Table 1-2.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTE
Page 386
Revision 1