BendixKing KI 525A System KFC 225 - Manual (Page 13)

KFC 225 AUTOMATIC FLIGHT CONTROL SYSTEM
System Operation
7
Rev. 0
Apr/99
10. VERTICAL TRIM ( UP / DN ) BUT-
TONS - The response of these but-
tons is dependent upon the vertical
mode present when pressed. If PIT
mode is active, successive button
presses will move the pitch attitude
hold reference either up or down by
0.5° per press, or at the rate of 0.8°
per second if held continuously, syn-
chronizing the pitch attitude refer-
ence to the current pitch attitude
upon release. If VS mode is active,
the initial button press will bring up
the commanded vertical speed in the
display. Subsequent immediate but-
ton presses will increment the verti-
cal speed command either up or
down at the rate of 100 ft/min per
button press, or at the rate of
approximately 300 ft/min per second
if held continuously. If ALT mode is
active, successive button presses
will move the altitude hold reference
altitude either up or down by 20 feet
per press, or if held continuously will
command the airplane up or down at
the rate of 500 ft/min, synchronizing
the altitude hold reference to the
actual airplane altitude upon button
release. (Note that neither the pitch
attitude nor the altitude hold refer-
ence is displayed. The display will
continue to show the altitude alerter
reference.)
11. ROTARY KNOBS - Used to
set the altitude alerter/altitude prese-
lect reference altitude. Large (outer)
knob changes reference by 1000’s
of feet, and the small (inner) knob
changes reference by 100’s of feet.
When the flight director is engaged,
will automatically arm a preselect
altitude hold capture.
12. VERTICAL SPEED ( VS ) MODE
SELECTOR BUTTON – When
pressed will engage the vertical
speed hold mode. The vertical
speed maintained is the vertical
speed present at the moment the VS
button is pressed. The vertical speed
command reference will initially be
displayed in place of the altitude
alert annunciation, defaulting back in
3 seconds to the altitude alerter
value. Pressing either the UP or DN
button will again cause the vertical
speed command reference to be dis-
played while causing it to increase or
decrease. When the VS button is
pressed again, it will disengage the
vertical speed mode. This button will
engage the flight director.
13. ALTITUDE ARM ( ARM ) BUT-
TON - When pressed will toggle alti-
tude arming on or off. When ALT
ARM is annunciated, the automatic
flight control system will capture the
altitude displayed in the Altitude
Alerter/Vertical Speed Display (pro-
vided the aircraft is climbing or
descending to the displayed alti-
tude). ALT ARM mode is engaged
automatically whenever the selected
altitude is changed via the rotary
knobs. Note that the alerter functions
are independent of the arming pro-
cess thus providing full time alerting,
even when the flight director is dis-
engaged. This button will engage the
flight director.