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Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-13 Rev. B 113
Abnormal Operation
Flight
Instruments EIS
Nav/Com/
XPDR/Audio AFCS GPS Nav
Flight
Planning Procedures
Hazard
Avoidance
Additional
Features
Abnormal
Operation
Annun/
Alerts Appendix Index
SUSPECTED AUTOPILOT MALFUNCTION
NOTE: Consult the aircraft documentation for the location of circuit breakers
as well as specifics that may supplement or amplify this procedure.
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 Switch. 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 electrically isolate the servo and
solenoid components.
5)
Release the AP DISC Switch.
OVERPOWERING AUTOPILOT SERVOS
In the context of this discussion, “overpowering” refers to any pressure or force
applied to the pitch controls when the autopilot is engaged. A small amount of
pressure or force on the pitch controls can cause the autopilot automatic trim to run
to an out-of-trim condition. Therefore, any application of pressure or force to the
controls should be avoided when the autopilot is engaged.
Overpowering the autopilot during flight will cause the autopilot’s automatic trim
to run, resulting in an out-of-trim condition or cause the trim to hit the stop if the
action is prolonged. In this case, larger than anticipated control forces are required
after the autopilot is disengaged.
The following steps should be added to the preflight check:
1)
Check for proper autopilot operation and ensure the autopilot can be
overpowered.
2)
Note the forces required to overpower the autopilot servo clutches.
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