Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 360

CESSNA 400B IFCS
(TYPE IF-550A)
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
button, located on the autopilot 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 will sound, and the yellow
autopilot disconnect (DISC) warning (WARN) light will illuminate on the
autopilot accessory unit 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 actuators, 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 warning light, on the accessory unit, will
illuminate yellow when the autopilot is disengaged by any means other
than the control wheel AUTOPILOT DISENGAGE switch. Whenever the
autopilot is disengaged by any means, the autopilot disengage horn will
produce a short tone lasting 1 to 2 seconds with decreasing amplitude. The
autopilot disconnect warning light (yellow) will remain on, until it is
cancelled by pressing the control wheel AUTOPILOT DISENGAGE
switch.
The pilot's control wheel incorporates five switches for other related
autopilot operations. Four of the switches are mounted on the left-hand
side of the control wheel and provide for operation of go-around, electric ,,-,...
trim, autopilot disengage, and electric trim disengage. The other switch,
mounted on the right-hand side of the control wheel, provides for operation
of pitch synchronization.
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