BendixKing KFC 500 - Manual (Page 16)

Normal Operation Normal Operation
22 23 June 15, 1999 006-18081-0000 006-18081-0000 June 15, 1999
switch determines which pilot is in
control of the single KFC 500 flight
director. L (left) or R (right) will be lit
depending on which position the
switch is in. The KFC 500 will
engage in only one horizontal and
one vertical tracking mode at a time.
Flight Director armed modes do not
conflict with active (capture or track)
modes. For example, selecting a
new course in the NAV ARM mode,
or a new altitude in Altitude Select,
does not affect active tracking modes
such as Heading or Vertical Speed
Hold. It is often useful to engage a
separate mode to provide flight guid-
ance to the capture point for a
course or altitude pre-selected in an
Arm mode. The Flight Director
System will transition automatically to
capture the armed mode, canceling
the previous selected mode.
Examples of this operation are
described in the Operational
Examples section of this Pilot’s
Guide. To cancel a flight director
mode engaged in either capture or
tracking operations, either select an
alternate tracking mode or press and
release the engaged mode’s push-
button on the mode select panel. The
latter method also cancels modes
while in their Arm phases. Go
Around is an exception. The collec- tive mounted push-button provides
the engage function only. To discon-
nect Go Around select another pitch
mode. The Flight Director provides
the basic modes - Roll Attitude
level/Heading Hold and Pitch
Attitude Hold. These default modes
provide basic flight stability and
serve as safety backups in the event
that the flight director cancels an
active mode due to loss of a required
navigation signal or sensor failure.
Engaging the KFC 500 in any track-
ing mode automatically cancels the
corresponding default mode for that
particular axis.
Pitch Attitude Hold & Roll
Attitude Hold (FD)
In the absence of any other selected
Flight Director modes, the system
will provide commands to maintain
current pitch attitude and establish a
level roll attitude. When roll attitude
approaches six degrees or less bank
angle, the flight director will provide
commands to maintain constant
heading.
Desired roll and pitch attitudes may
be selected by several methods. If
the Flight Director is coupled to the
autopilot (AP ON), the helicopter’s
attitude may be manually adjusted
by pressing and holding the Force
Trim Release (FTR) switch on the
cyclic while repositioning the heli-
copter to the desired attitude. Upon
release of the FTR switch, the Flight
Director will provide commands to
maintain the new target pitch and roll
attitude if greater than 6°. If the roll
attitude is less than 6° the system
will provide commands to return to
roll level and hold the existing head-
ing. Alternatively, Attitude Hold com-
mands may be modified by moving
the Cyclic mounted Beep Trim
(CBT) switch in the appropriate
directions. If a target roll attitude of
six degrees or less is selected, the
Flight Director will provide com-
mands to maintain the helicopter’s
current heading. Selecting any hori-
zontal or vertical tracking mode can-
cels Roll Attitude/Heading Hold or
Pitch Attitude Hold, respectively.
Either mode may be used in con-
junction with any Arm mode to pro-
vide flight guidance for course or alti-
tude intercepts. Pressing the FD
switch without any FD modes
engaged will engage the basic
default modes. Pressing FD when
any modes are engaged will disen-
gage all Flight Director modes and if
AP is engaged system will revert to
basic AP Attitude Hold modes. Lateral Command Control
Activated by the Cyclic Beep Trim
(CBT) switch when the Flight
Director is on, Lateral Command
Control modifies the system’s refer-
ence attitude during operations in
Roll Attitude Hold. Operating Lateral
Command Control does not affect
Capture/Track in Navigation (NAV)
mode or Capture/Track in Approach
(APR) mode. To operate Lateral
Command Control with Navigation or
Approach mode in track, the mode
must first be deselected by pushing
the button on the Mode Select
Panel. When the system mode is roll
level or bank angle hold (FD and/or
AP) and the Lateral Command
Control is used, the aircraft will be
commanded to follow the pilot’s
input to roll left or right. If the switch
is held continuously the system will
command a constant roll rate until
the beep trim switch is released. If
the switch is pushed discretely, the
first push will yield 6° of bank if heli-
copter is level and 1° of bank for
each additional push or click. If heli-
copter is greater than +/- 6° the first
click and each subsequent click will
yield 1°. Upon release of the CBT
switch, the flight director will com-
mand the aircraft to maintain the
FD
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