190-02011-11 Rev. 2
GFC 600 Autopilot Installed in Piper PA-46-310P/350P
Page 19 of 46
ELEVATOR MISTRIM
(Amber AP LED flashes for 10 seconds, ELE TRM UP or ELE TRM DN displayed in Message Window on
GMC 605 display)
Indicates a mistrim of the elevator while the autopilot is engaged. The autopilot will normally trim the
airplane as required. However, during rapid acceleration, deceleration, configuration changes, or near
either end of the elevator trim limits, momentary illumination of this message may occur. If the autopilot is
disconnected while this message is displayed, high elevator control forces are possible.
Do not attempt to overpower the autopilot in the event of a pitch mistrim. The autopilot
servo will oppose pilot input and will cause pitch trim to run opposite the direction of
pilot input. This will lead to a significant out-of-trim condition, resulting in large control
wheel force when disengaging the autopilot.
NOTE
Momentary display of the ELE TRIM UP or ELE TRIM DN message during
configuration changes or large airspeed changes is normal.
1. Control Wheel……………………………………………………………………………………GRIP FIRMLY
Be prepared for significant sustained control forces in the direction of the mistrim
annunciation. For example, ELE TRM DN indicates nose down control wheel force will
be required upon autopilot disconnect.
2. AP DISC / TRIM INT Switch ……………………………………………………..…PRESS AND RELEASE
3. Manual Elevator Trim …………………………………………………………………..RE-TRIM as required
4. The autopilot should be considered inoperative until the cause of the mistrim has been investigated
and corrected. Yaw damper may be re-engaged and used normally.
WARNING
WARNING
Summary of Contents for GFC 600
Page 1: ......
