Beechcraft C-12C Operator And Technical Reference Manual page 321

MODE
Pitch Sync
ALT Hold
VA Hold
ALT Preselect
g. Controls and
Figure 3B-17.
(1) Pitch Wheel. Rotation of the pitch wheel
results in a change of pitch attitude proportional to the
rotation of the pitch wheel and in the direction of wheel
movement. Movement of the pitch wheel cancels any
other previously selected vertical mode.
movement of the pitch wheel has no effect with the
autopilot coupled to the glideslope.
(2) BANK LIMIT Push Button. Selection of
the bank limit mode on the autopilot controller provides
a lower maximum bank angle while in the Heading
Select mode. LOW will illuminate on the BANK LIMIT
switch. The lower bank limit is inhibited and LOW is
extinguished during NAV mode captures. If heading
select is again engaged, BANK LIMIT will again be
illuminated. Pressing BANK LIMIT when illuminated
will return autopilot to normal bank limits.
Table 3B-3. Autopilot System Limits (Continued)
CONTROL OF SENSOR
TCS Switch on Control
Wheel
Air Data Computer
Air Data Computer
Air Data Computer
Functions. Refer
However,
PARAMETER
Pitch Altitude Command
ALT Hold Engage Range
ALT Hold Engage Error
Pitch Limit
Pitch Rate Limit
VERT Speed Engage
Range
ALT Speed Hold Engage
Error
Pitch Rate
Pitch Rate Limit
Preselect Capture Range
Maximum Vertical Speed
for Capture
Maximum Gravitational
Force During Capture
Maneuver
Pitch Limit
Pitch Rate Limit
to (3) SOFT RIDE Push Button.
reduces autopilot gains while still maintaining stability
in rough air. This mode may be used with any flight
director mode selected.
(4) TURN Knob. Rotation of the TURN knob
out of detent results in a roll command. The roll angle
is proportional to and in the direction of the TURN
knob rotation. The TURN knob must be in detent,
center position, before the autopilot can be engaged.
Rotation of the TURN knob cancels any other
previously selected lateral mode.
(5) YD ENGAGE Push Button.
autopilot is not engaged, the yaw damper may be
utilized by pressing the YD ENGAGE push button.
(6) AP ENGAGE Push Button.
ENGAGE push button is used to engage the autopilot.
Engaging the autopilot automatically engages the yaw
damper. The autopilot may be engaged with the
airplane in any reasonable attitude.
TM 1-1510-218-10
VALUE
± 20° max
0 to 50,000 ft
± 20 ft
± 20°
Function of (TAS)
0 to ± 6000 ft/min
± 30 ft
± 20°
Function of (TAS)
0 to 50,000 ft
± 4000 ft/min
± .2g
± 20°
Function of (TAS)
Soft ride
When the
The AP
3B-31