A separate additional AP PITCH MISTRIM/AP ROLL MISTRIM annunciator is located on the
annunciator panel where it is more readily visible to the pilots. The AP PITCH MISTRIM annunciator
is a repeat of the TRIM annunciator on the autopilot control panel. The AP ROLL MISTRIM
annunciator indicates to the pilot that a sufficient level of roll mistrim is present and 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. When the bank limit mode is
engaged, the autopilot maximum bank angle is limited to 14°. When the mode is engaged, LOW will
annunciate in the pushbutton. Low bank mode will be automatically selected when climbing through
34,000 feet altitude, and automatically cancelled when descending through 33,750 feet. If heading
mode is selected and then deselected while low bank is engaged low bank mode will be disengaged
and the engage light will extinguish during the time heading mode is disengaged. Low bank mode
will reengage and the LOW annunciator will re-illuminate when heading mode is reengaged. When
low bank mode is engaged, a green low bank limit mark will appear on each side of the vertical index
at the top of the attitude sphere.
The autopilot is normally disengaged in one of three ways: (1) depressing the AP/TRIM DISC switch
on either yoke, (2) electrically trimming the elevator trim system, or (3) depressing the go-around
button on either throttle. Actuation of the touch control steering button on the yoke will interrupt the
pitch and roll servos until the switch is released; the yaw damper will remain engaged. If the autopilot
is disengaged by any of the above three ways, a warning tone will sound for one second and the
amber AUTOPILOT OFF light will illuminate for one second. Any other disconnect will cause the
warning tone to sound for one second and the amber AUTOPILOT OFF light to stay illuminated. The
amber light can be turned off by holding the AP/TRIM DISC switch for two seconds, or by pressing
the electric trim switch or the go-around (GA) button on either throttle. The autopilot will also
disengage if an overriding force (sustained torque) is applied to the vertical or horizontal axis for a
minimum preset time. Disconnect will be annunciated by the one-second disconnect tone and
illumination of the autopilot disconnect light, until the light is extinguished by one of the above
methods.
ALTITUDE ALERTING SYSTEM
An altitude alerting system provides a visual indication of when the airplane is within 1000 feet of a
preselected altitude and normalizes when the airplane is within 200 feet of the preselected altitude.
After capture, the system will reactivate if the airplane departs more than 200 feet from the selected
altitude. As the airplane approaches within 1000 feet of the preselected altitude, the color of the
altitude display will change to amber and the altitude alert warning tone will sound for one second. As
the airplane approaches to within 200 feet of the selected altitude, the display will change back to
blue. If the airplane again deviates from the selected altitude by more than 200 feet, the altitude
display will change to amber and the altitude alert tone will sound for one second. The display will
remain amber until the airplane returns to within 200 feet of the altitude, or until the altitude selection
is reset. The altitude selection is set into the upper right corner of the primary flight display (PFD) by
means of the ALT SEL knob on the lower right side of the multi-function display (MFD). The selected
altitude setting is also visible, in the same color codes, above the ALT SET knob on the MFD.
Cessna Citation XLS - Instrumentation & Avionics
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