Garmin CIRRUS PERSPECTIVE SR20 Line Maintenance Manual page 234

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7.11.2.3 Autopilot Clutch Overpower Check
The GFC 700 uses electronic torque limiting and 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 GMC 705.
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. Engage the Yaw Damper by pressing the YD button on the GMC 705 (on aircraft so
equipped).
4. Verify the ability to overpower the YD clutch by applying manual rudder inputs in both
directions.
7.11.2.4 Autopilot Operation Checks
1. Engage the Autopilot by pressing the AP key on the GMC 705.
2. Press the HDG key on the GMC 705 to synchronize the heading bug to the present
aircraft heading on the HSI.
3. Select Heading mode by pressing the HDG key on the GMC 705. The command bars
should be level and the control stick should be stationary (very slow movement is
acceptable due to the aircraft not being perfectly level).
4. 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.
5. Holding the control stick lightly, rotate the pitch command wheel UP on the GMC 705 to
increase the pitch reference. The command bars should move up and the control stick
should begin moving aft. In some aircraft, the down spring may require manual
assistance to get aft control stick movement.
6. Rotate the pitch command wheel DN on the GMC 705. The command bars should
command down and the control stick should begin moving forward.
7. Press the AP DISC switch to disconnect the Autopilot. Center the pitch trim using the
MEPT switch.
8. Engage the Autopilot by pressing the AP key on the GMC 705.
9. Command full NOSE UP or NOSE DN by rotating the control wheel on the GMC 705 in
the appropriate direction. Hold the control stick firm and watch for a mistrim
annunciation on the PFD.
10. While continuing to hold the control stick, press the AP DISC switch and verify that the
trim drives in the same direction as the commanded NOSE UP or NOSE DN as shown by
the Flight Director command bars on the PFD.
Page 7-60
Rev. E
NOTE
Cirrus Perspective™ Line Maintenance Manual
190-00920-00