
G1000 System Maintenance Manual – Diamond DA40/40F Page 4-29
190-00545-01 Revision G
4.10.4 GSM 86 Manual Overpower Check
These procedures are applicable to GFC 700 installations with GSM 86 servo gearboxes.
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
(Reference Section 4.10.2).
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 and verify the trim clutch can be overpowered in
both directions. If the trim clutch cannot be overpowered, check the trim servo clutch torque setting
(Reference Section 4.10.2).
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.
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