Honeywell KAP 140 Installation Manual page 6

7. BACK COURSE APPROACH (REV) MODE SELECTOR BUTTON
- When pushed, will arm the Back Course approach mode. This mode functions similarly to
the approach mode except that the autopilot response to LOC signals is reversed, and GS
is disabled.
8. ALTITUDE HOLD (ALT) MODE SELECT BUTTON - When pushed will select the
Altitude Hold mode. This mode provides tracking of the reference altitude. The reference
altitude is the altitude at the moment the ALT button is pressed. If the ALT button is
pressed with an established VS rate present, there will be altitude overshoot
(approximately 10% of the VS rate), with the airplane returned positively to the reference
altitude.
9. VERTICAL TRIM (UP/DN) BUTTONS
- The action of these buttons is dependent upon the vertical mode present when pressed.
If VS mode is active, the initial button stroke will bring up the commanded vertical speed in
the display. Subsequent immediate button strokes will increment the vertical speed
commanded 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,
incremental button strokes will move the altitude hold reference altitude either up or down
at 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 the altitude hold reference is not displayed. The display will
continue to show the altitude alerter reference.)
10. ROTARY KNOBS
- Used to set the altitude alerter reference altitude; or may be used immediately after
pressing the BARO button, to adjust the autopilot baro setting to match that of the
airplane's altimeter when manual adjustment is required.
11. BARO SET (BARO) BUTTON
- When pushed and released, will change the display from the altitude alerter selected
altitude to the baro setting display (either IN HG or HPA) for 3 seconds. If pushed and held
for 2 seconds, will change the baro setting display from IN HG to HPA or vice versa. Once
the baro setting display is visible the rotary knobs may be used to manually adjust the baro
setting.
12. ALTITUDE ARM (ARM) BUTTON
- When pushed will toggle altitude arming on or off. When ALT ARM is annunciated, the
autopilot will capture the altitude alerter displayed altitude (provided the aircraft is climbing
or descending in VS to the displayed altitude). When the autopilot is engaged, ALT arming
is automatic upon altitude alerter altitude selection via the rotary knobs. Note that the
alerter functions are independent of the arming process thus providing full time alerting,
even when the autopilot is disengaged.
13. ALTITUDE ALERTER/VERTICAL SPEED/BARO SETTING DISPLAY
- Normally displays the altitude alerter selected altitude. If the UP or DN button is pushed
while in VS hold, the display changes to the command reference for the VS mode in FPM
for 3 seconds. If the BARO button is pushed, the display changes to the autopilot baro
setting in either IN HG or HPA for 3 seconds.
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