Mooney M20M, Pilot Operating Handbook

Page: 329 / 377

190-02291-18 Rev. 5 AFMS – GFC 500 Mooney M20M/M20R/M20S Series
Page 3–7
HEADING DATA SOURCE FAILURE
This procedure applies only if the optional heading source to the navigator is installed:
1. Autopilot ................................................................... SELECT different lateral mode (as necessary)
NOTE
Track information will be displayed on the G5, GI 275, or G3X.
GPSS will not be provided to the autopilot for heading legs.
ELEVATOR MISTRIM
(Amber TRIM UP or TRIM DOWN displayed on the G5, GI 275, or G3X)
This annunciation indicates a mistrim of the elevator while the autopilot is engaged. If an optional pitch
trim servo is installed, 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.
If the optional pitch trim servo is NOT installed.
1. Refer to the Normal Procedures section of this AFMS, MANUAL PITCH TRIM WITH
AUTOPILOT ENGAGED.
If the optional pitch trim servo is installed:
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 TRIM UP or TRIM DOWN 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, TRIM DOWN indicates nose down control wheel force will be
required upon autopilot disconnect.
2. AP DISC / TRIM INT Button .........................................................................PRESS AND RELEASE
3. Manual Elevator Trim ....................................................................................... RE-TRIM as required
NOTE
Electric pitch trim should be considered inoperative until the cause of the mistrim has
been investigated and corrected.
WARNING
WARNING