BendixKing KI 525A System KFC 225 - Manual (Page 19)

KFC 225 AUTOMATIC FLIGHT CONTROL SYSTEM
System Operation
13
Rev. 1
Sep/04
AP
VS ARM
G
KFC 225
HDG NAV APR REV ALT FD DN
UP
YD
P R
ALT SEL
To initiate a climb or descent from
Altitude Hold (
ALT ) mode:
1. VS button - Press. Note ALT
changes to VS and current vertical
speed is displayed.
2. UP or DN button - Select
desired climb or descent rate.
Each button stroke will change the
vertical speed commanded up or
down by 100 ft/min per button
press, or at the rate of approxi-
mately 300 ft/min per second if
held continuously.
Note: VS command value will be dis-
played during Control Wheel
Steering (CWS) and for three sec-
onds following VS engagement or
pressing the UP or DN button. Both
altitude and vertical speed utilize the
same display area. Altitude is always
displayed except during vertical
speed selection. If the VS command
value is not displayed, pressing (and
releasing) the UP or DN button will
not change the indicated altitude ref-
erence but will display the VS com-
mand value.
Note: When operating at or near the
best rate of climb airspeed, at climb
power settings, and using vertical
speed hold, it is easy to decelerate
to an airspeed where continued
decreases in airspeed will result in a
reduced rate of climb. Continued
operation in vertical speed mode
can result in a stall. Pitch Attitude
Hold may provide better operation at
these airspeeds.
Altitude Hold (ALT) Mode
The Altitude Hold ( ALT ) mode
maintains the pressure altitude
acquired upon selection of altitude
hold. The
ALT button toggles
between altitude hold and pitch atti-
tude hold modes.
To operate in the ALT mode:
1. ALT button - Press. Note ALT
is annunciated and autopilot
maneuvers to maintain pressure
altitude acquired at button selec-
tion.
2. UP or DN button - Select to
change altitude. Button strokes will
move the reference altitude by 20
feet per press, or if held continu-
ously will command a 500 ft/min
altitude change, acquiring a new
reference altitude upon button
release.
Note: The system incorporates auto-
matic Baro correction capability. Any
change in Baro setting will be com-
pensated for by the autopilot to con-
tinue holding the reference altitude.
Note: When altitude hold is engaged
and holding an altitude, and the AP
button is depressed to disengage the
AP, the system defaults to FD and
ALT hold. If an altitude change is
made up or down the Altitude mode
must be cycled off th
e n back on, by
cycling the ALT button. If the ALT
mode is not cycled and the AP is
reengaged, the AP will seek the pre-
viously selected altitude.