BendixKing KAP 140 - Manual (Page 72)

Two Axis/Altitude Preselect Operations
86 KAP 140 AUTOPILOT SYSTEM
Rev. 2
May/02
AP
G
KAP 140
HDG NAV APR REV ALT DN
UP
ARM BARO
Vertical Speed (VS) Mode
The Vertical Speed (VS) mode
allows variable speed climbs and
descents. The ALT button toggles
between altitude hold and vertical
speed modes.
Note: The KAP 140 engages into VS
mode as a default.
To operate in the VS mode
(with autopilot currently disengaged):
1. AP button - Press. Note ROL,
VS and current vertical speed is
displayed. If no other modes are
selected the autopilot will operate
in the ROL and vertical speed
hold modes. For software version
03/01 and later, the AP button
must be pressed and held for 0.25
seconds to engage the autopilot.
2. UP or DN button - Select
desired climb or descent rate.
Each button stroke will increment
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.
To initiate a climb or descent from
Altitude Hold (ALT) mode:
1. ALT button - Press. Note ALT
System Operating Modes
The lateral modes (HDG, NAV, APR and REV) operate identically as depicted
in the KAP 140 Single Axis Operating Modes section. Please refer to that sec-
tion for text descriptions of lateral mode operation.
changes to VS and current vertical
speed is displayed.
2. UP or DN button - Select
desired climb or descent rate.
Each button stroke will increment
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.