Garmin GFC 600 Pilot’s Guide
190-01488-00 Rev. B
Abnormal Operation
63
SECTION 4 ABNORMAL OPERATION
4.1 SUSPECTED AUTOPILOT MALFUNCTION
If an autopilot failure or trim failure is suspected to have occurred, perform the
following steps:
1)
Firmly grasp the control wheel.
2)
Press and hold the
AP DISC / TRIM INT
button. The autopilot will
disconnect and power is removed from the trim motor. Power is also
removed from all primary servo motors and engaged solenoids. Note the
visual and aural alerting indicating autopilot disconnect.
3)
Retrim the aircraft as needed. Substantial trim adjustment may be needed.
4)
Pull the appropriate circuit breaker(s) to remove electrical power from the
GMC 605 and servos. The GMC 605 display may remain active for up to 10
seconds after power in removed.
5)
Release the
AP DISC / TRIM INT
button.
4.2 OVERPOWERING AUTOPILOT SERVOS
In the context of this discussion, “overpowering” refers to any pressure or force
applied to the controls when the autopilot is engaged. In an emergency the pilot can
forcibly overpower the servos and move the controls throughout their full range of
motion without disengaging the autopilot, however even a small amount of pressure
or force applied by the pilot in the pitch axis may cause the automatic trim to run.
If the action is prolonged this will result in an out-of-trim condition and significant
control forces upon autopilot disengagement. Therefore, any application of pressure
or force to the controls should be avoided when the autopilot is engaged.
NOTE:
It is acceptable to engage the autopilot on the ground and overpower
the servos to verify proper operation and experience the forces required to
move the controls while backdriving the servo motors.
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