
Page 8-12 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
8.3.3 Autopilot Clutch Overpower Check
NOTE
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 MFD.
2. Apply force to the control stick to determine if the Autopilot clutches can be overpowered in
pitch and roll. If the Autopilot clutches cannot be overpowered, check the servo clutch torque
settings.
3. Actuate the MEPT switch in the nose down position. This causes an Autopilot disconnect and the
trim will run in the nose down direction.
4. While the trim is running, grasp the aircraft pitch trim wheel and verify that the trim clutch can be
overpowered in both directions.
5. Actuate the MEPT switch in the nose up position Run the trim in the nose up direction and verify
the trim clutch can be overpowered in both directions.
NOTE
If the trim clutch cannot be overpowered, check the trim servo clutch torque setting. See Section 4.10
6. Verify also that the trim wheel moves smoothly in both directions throughout the entire trim
range during MEPT switch operation.
NOTE
If the trim wheel hesitates, this may indicate that the pitch trim clutch is slipping. First verify proper
clutch setting and cable tension. If both clutch setting and cable tension are within tolerance, check
the aircraft pitch trim system for excessive friction.
8.3.4 Manual Electric Trim Speed Check
1. Run the manual electric trim in one direction until it runs against the stop.
2. Using a stop watch or equivalent device, time the trim speed from one end of travel to the
opposite stop. The elapsed time should measure 17 ± 3 seconds for each direction.
8.3.5 Autopilot Operation Checks
1. Engage the Autopilot by pressing the AP key on the MFD. Push the HDG knob in to synchronize
the heading bug to the present aircraft heading on the HSI. Select Heading mode by pressing the
HDG key on the MFD. The command bars should be level and the control stick should be
stationary (very slow movement acceptable, due to the aircraft not being perfectly level).
2. Turn the HDG knob to the left and right and check that the command bars move in the correct
direction and the control stick follows the command bars.
3. Push the CWS button and pull the control stick to the middle of the pitch control range. Release
the CWS button. The Autopilot clutches should re-engage and hold the stick stationary.
4. Holding the control stick lightly, press the NOSE UP key on the MFD twice, to increase the pitch
reference. The command bars should move up 1 degree and the control stick should begin
moving aft. In some aircraft, the down spring may require manual assistance to get aft control
stick movement.
5. Hold the control stick and press the CWS button, re-synchronizing the pitch reference and re-
centering the control stick. Release the CWS button and check that servo clutches re-engage
before releasing the control stick.
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