Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 346

CESSNA 400B AUTOPILOT
(TYPE AF-550A)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
pilot by eliminating the need to set the DG heading bug to
· the desired VOR or ILS course. When course datum · is
installed, the autopilot will automatically track the VOR
or ILS course selected by the OBS on the CDI or course
selector on the slaved HSI.
The control unit (flight controller) and accessory unit contain most of
the operating controls for the autopilot. In addition, there are three
switches mounted on the pilot's control wheel and two switches mounted in
the autopilot accessory unit. The three switches on the pilot's control
wheel provide for manual electric trim operation, autopilot disengage and
electric trim disengage. An AP NA V 1/NA V 2 switch in the autopilot
accessory unit provides for selection of the desired VOR receiver (NA V 1
or NA V 2) and a REV SNS selector switch (LOC 1 or LOC 2), also in the
autopilot accessory unit, is provided to select back~course (reverse
sensing) operation on the desired navigation receiver. All operating
controls necessary to properly operate the 400B autopilot are shown in
Figure
1.
An automatic autopilot disengage function (provided by the "G"
switch in the acceleration sensor) will automatically disengage the
autopilot anytime the airplane pitches down at more than a normal rate
from normal flight attitude. The operational capability of the disengage
function should be tested before takeoff by pressing the TEST EA FLT
button, located on the accessory unit. When the TEST button is pressed
with the autopilot engaged, the "G" switch in the acceleration sensor is
actuated and
if
the "G" switch is functional, the autopilot will disengage,
the autopilot disconnect horn w ill sound, and the autopilot disconnect
(DISC) warning (WARN) light will illuminate yellow to advise the pilot the
autopilot disengage system is operational.
The autopilot will also be automatically disengaged anytime the
airplane pitches up or down more than a normal amount from a level flight
attitude. In this event, the disconnect horn would sound and the disconnect
light would illuminate, advising the pilot that the autopilot has disen-
gaged.
An additional autopilot disengage feature is provided by a thermos-
tatic switch which monitors the operating temperature of the aileron and
elevator actuators. If the temperature becomes abnormal in either the roll
or pitch actuator, the thermostatic switch opens and disengages the
autopilot to remove power from the actuator. After approximately 10
minutes , the switch automatically resets to close the autopilot interlock
circuit. Power can then be reapplied to the actuator by re-engaging the
AP/ON-OFF switch.
The autopilot disconnect (DISC) warning (WARN) light, on the acces-
2
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