9.1-1 GENERAL
The System Fifty Five X is a rate based autopilot. A turn coordinator hidden
behind the instrument panel provides turn rate. When in control of the roll
axis, the autopilot senses roll/yaw rate, as well as closure rate to the selected
course, and the non-rate quantities of heading error, course error, and course
deviation indication. When in control of the pitch axis, the autopilot senses
vertical speed, acceleration, and closure rate to the selected glideslope,
along with the non-rate quantities of altitude and glideslope deviation
indication. These sensed data provide feedback to the autopilot, which
processes them in order to control the aircraft through the use of servos
coupled to the control system. The roll servo is coupled to the ailerons. The
pitch servo is coupled to the elevator. Activation of roll axis control must
always precede activation of pitch axis control.
The pitch auto-trim function senses when the airplane needs to be trimmed
about the pitch axis and responds by driving the trim servo in the proper
direction to provide trim. The trim servo is coupled to the elevator trim wheel
in the cockpit and thereby to the elevator trim tabs.
The yaw damper senses lateral acceleration at the tail, and responds by
driving the yaw servo in the proper direction to provide damping. The yaw
servo is coupled to the rudder.
Refer to the S-TEC Pilot’s Operating Handbook – Fifty Five X dated
November 30, 2007 or later for full operational procedures and descriptions
of implemented modes. The System 55X POH also contains detailed
procedures for accomplishing GPS and VOR course tracking, front course
and back course localizer approaches, and glideslope tracking.
NOTE: The KODIAK 100 implementation of the System 55X Autopilot
does not utilize the CWS (Control Wheel Steering).
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