BendixKing KFC 500 User Manual

Page 20

YD (yaw damper)

The lamp above the YD pushbutton
illuminates and a green “YD”
appears on the EADI when yaw
damp is engaged. The YD pushbut-
ton alternately engages and disen-
gages yaw damper functions inde-
pendently of autopilot operation. The
yaw damper will automatically
engage when the autopilot is
engaged. Autopilot disengagement
will NOT, however, disengage the
yaw damper. Yaw damper disen-
gagement is annunciated by a flash-
ing red “YD” on the EADI.

The yaw damper augments rotor-

craft stability by opposing uncom-
manded yaw motion, while also offer-
ing turn coordination and ball
centering. In case of hydraulic power
loss, consult the Rotorcraft Flight
Manual Supplement for the proce-
dures specified for yaw damper oper-
ation. Loss of #1 hydraulic system
automatically disconnects the YD.

AP (autopilot)

The lamp above the AP pushbutton
illuminates when the autopilot is
engaged. The AP pushbutton alter-
nately engages and disengages the
autopilot. Pressing the Autopilot
pushbutton initiates autopilot control
of the pitch, roll and yaw axes. The
yaw damper, if not previously
engaged, engages automatically
upon autopilot activation. In the
absence of any selected flight direc-
tor modes, the autopilot will follow
basic Roll Attitude Hold and Pitch
Attitude Hold commands synchro-
nized to the aircraft attitude current
upon activation.

KMS 540 Autopilot and Yaw Damper Mode Selection

☛

Autopilot pushbutton engages all
three axes with trim; pitch, roll, and
yaw.