Bendix/King KFC 400 - Yaw Damper (YD); Half Bank (HB); Soft Ride (SOFT RIDE); Roll Attitude Control

Hold commands synchronized to the
aircraft attitude current upon activa-
tion.
System integrity is ensured by
automatic self-monitoring tests con-
ducted by the KFC 400 during auto-
pilot operation. In the unlikely event of
autopilot or servo motor malfunction
the Flight Control System automatical-
ly disengages the servo motor clutch
and drive power to the affected axis.
The
"R", "P" or "Y" LEDs on the
KMC
440 illuminate to alert the flight
crew to axis decoupling and AP FAIL
will flash for
2 seconds, then remain
on solid.
Pressing the Autopilot key a
second time cancels its operation.
The flight director and yaw damper,
however, remain engaged until they
are cancelled individually.
Yaw Damper (YD)
The Yaw Damper key alternately
engages and disengages yaw damper
functions independently of autopilot or
flight director operation.
If the yaw
damper was previously engaged
through autopilot activation, pressing
the key cancels the function.
The yaw damper augments
aircraft stability by opposing uncom-
manded motion about the yaw axis
and provides turn coordination. In
case of engine power
loss consult the
aircraft flight manual supplement for
the procedures specified for yaw
damper operation.
Half .Bank (HB)
With the Half Bank mode engaged
the flight director reduces its maxi-
mum roll attitude command to one-
half of the normal limit.
Roll com-
mands of lesser magnitude are not
affected.
Half Bank may be engaged in
conjunction with any flight director
tracking mode with the exception of
Approach. Half Bank may be em-
ployed at the same time as Approach
Arm, but will cancel automatically
upon initiation of the Approach
Capture sequence.
Soft Ride (SOFT RIDE)
With the Soft Ride mode engaged
the flight director reacts more slowly
than normal
to deviations from the
planned flight track or aircraft attitude.
Most useful to reduce command
activity in turbulent air, Soft Ride may
be engaged any time a generally
smoother flight is more desirable than
immediate corrections of slight
altitude, heading or airspeed devia-
tions.
The specific degree of command
softening employed in the Soft Ride
mode is determined for each aircraft
type during KFC
400 certification.
any mode as long as the autopilot is
engaged, with the exception of
approach. Soft Ride may be em-
ployed at the same time as Approach
Arm, but will cancel automatically
upon initiation of the Approach
Capture sequence.
Soft Ride may be engaged with
Roll Attitude Control
Activated by the rotary, return-to-
center control knob on the KMC
440,
Roll Attitude Control modifies the flight
director's reference attitude during
operations in
Roll Attitude Hold.
Turning the
Roll Attitude Control knob
in either direction cancels any selec-
ted flight director horizontal mode and
engages
Roll Attitude Hold. Operating
Roll Attitude Control does not affect
Arm operations in Nav or Approach
modes, nor does it affect flight director
vertical modes, with the exception of
A1