Specifications

SECTION III
MODEL 560 INSTRUMENTATION AND AVIONICS
The selection of NAV 1, NAV 2 or FMS on the DC-550 display controller push-buttons controls the
source of navigation information to the flight director, as well as selects the source of navigation information
displayed on the EFIS course deviation indicator of the PFD.
AUTOPILOT CONTROL PANEL
The autopilot control panel, mounted on the pedestal, provides the means of engaging the autopilot
and yaw damper, as well as manually controlling the autopilot through the turn knob and pitch wheel.
The autopilot (AP) engage switch is used to engage the autopilot and yaw damper. The yaw damper
(YD) switch is used to engage and disengage the yaw damper without the autopilot. Use of the yaw
damper while manually controlling the airplane aids in airplane stability and passenger comfort. The push-
on push-off AP and YD switches are illuminated green when engaged. Pressing the AP switch when the
autopilot is engaged will disengage the autopilot but leave the yaw damper engaged. Pressing the YD
switch when both YD and AP are engaged will turn off both the yaw damper and the autopilot. The yaw
damper and autopilot may also be disengaged with the red AP TRIM DISC button on the pilot’s and
copilot’s control wheels. Pressing the go around (GA) button on either throttle will disconnect the autopilot
and force the flight director into go around mode; the yaw damper will remain engaged.
The pitch wheel allows manual pitch control of the airplane proportional to the rotation of the wheel
and in the direction of wheel movement. Movement of the wheel also cancels any other previously selected
vertical mode. The turn knob allows manual bank control of the airplane proportional to and in the direction
of knob movement. Turns with a maximum bank angle of 27 degrees can be performed with the turn knob.
The turn knob must be in the center detent position before the autopilot can be engaged. Rotation of the
turn knob out of detent cancels any other previously selected lateral mode.
The elevator trim indicator shows an out of trim condition, in the direction indicated by illumination of
UP or DN in the TRIM annunciator, when a sustained trim input is being applied to the elevator servo. The
indicator should be OFF before engaging the autopilot. If the TRIM annunciator is illuminated and the
autopilot must be disengaged, the pilot must be prepared for an out-of-trim condition in the annunciated
direction. A separate additional AP PITCH MIS-TRIM/AP ROLL MIS-TRIM annunciator is located on the
center instrument panel where it is more readily visible to the pilots. The AP PITCH MIS-TRIM annunciator
is a repeat of the TRIM annunciator on the autopilot control panel. The AP ROLL MIS-TRIM annunciator
indicates to the pilot that a sufficient level of roll mis-trim is present that the pilot must be prepared for an
out-of-trim roll condition if the autopilot is disconnected. The bank limit (LOW) mode may be selected if it is
desired to limit the maximum bank angle during autopilot operation. The mode is limited to use in
conjunction with heading (HDG) mode only.
Figure 3-19. Autopilot Control Panel
I 56OMB-01 Configuration AA 3-37