Garmin G1000 Pilot’s Guide for the Socata TBM 850/900
190-00709-05 Rev. D
502
AUTOMATIC FLIGHT CONTROL SYSTEM
The following AFCS controls are located separately from the AFCS Control Unit:
AP DISC Switch
(Autopilot
Disconnect)
Disengages the autopilot, yaw damper, and flight director and interrupts pitch trim
operation
An
AP DISC
Switch is located on each control wheel.
This switch may be used to acknowledge an autopilot disconnect alert and mute the
associated aural tone.
CWS Button
(Control Wheel
Steering)
While pressed, allows manual control of the aircraft while the autopilot is engaged and
synchronizes the flight director’s Command Bars with the current aircraft pitch (if
not in a Vertical Navigation, Glideslope, or Glidepath Mode) and roll (if in Roll Hold
Mode)
A
CWS
Button is located on each control wheel.
Upon release of the
CWS
Button, the flight director may establish new pitch and roll
references, depending on the current vertical and lateral modes. CWS operation
details are discussed in the respective mode sections of this manual.
GA Switch
(Go Around)
Disengages the autopilot and selects flight director Takeoff (on ground) or Go Around
(in air) Mode
If an approach procedure is loaded this switch also activates the missed approach when
the selected navigation source is GPS or when the navigation source is VOR/LOC and
a valid frequency has been tuned.
The
GA
Switch is located on the throttle.
MEPT Switch
(Manual Electric
Pitch Trim)
Used to command manual electric pitch trim. An
MEPT
Switch is located on each
control wheel.
The TBM 850 uses a two-piece switch, split into left and right sides. On the left is
the ARM Switch and on the right is the UP/DN Switch. The UP/DN Switch, when
operated simultaneously with the ARM Switch, adjusts pitch trim down (forward)
and up (rearward). Pushing the ARM Switch disengages the autopilot, if currently
engaged, but does not affect yaw damper operation. The ARM Switch may be used
to acknowledge an autopilot disconnect alert and mute the associated aural tone.
If either side of the switch is active separately for more than three seconds, MEPT
function is disabled and ‘PTRM’ (Pitch Trim Failure) is displayed as the AFCS Status
Annunciation on the PFDs. The function remains disabled until both sides of the
switch are activated.
The TBM 900 uses a four direction switch. Pushing down on the switch and
operating the switch forward and backward adjusts pitch trim down (forward) and
up (rearward). Pushing the switch in either direction disengages the autopilot, if
currently engaged, but does not affect yaw damper operation.
MEYT Switch
(Manual Electric
Yaw Trim)
Used to command manual electric yaw trim
The TBM 850 has an
MEYT
Switch located on each control wheel.
The TBM 900 uses a four direction switch. Operating the switch left and right adjusts
yaw trim left or right.
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