Operating Modes; Ll Co Upled M O Des - Honeywell BENDIX/KING KAP 140 Maintenance Manual

2.10 OPERATING MODES

Normal mode operation will be inhibited until the preflight test has been performed. When the CWS
switch is active, the autopilot control will be momentarily released and the pitch mode reference
will synchronize to the aircraft if engaged in VS or ALT HOLD modes.
2.10.1 ROLL COUPLED MODES
2.10.1.1 Roll Default Mode (ROL)
The ROL mode uses the combined yaw/roll rate gyro sensor to provide a servo command which
will maintain a level roll attitude (by holding yaw rate to zero). This mode is the default roll mode
when all other roll modes have been deactivated. The loss of the required sensor for a particular
roll mode results in a reversion to the default roll mode. This mode is annunciated by displaying
"ROL" in the roll coupled field. The FCC receives roll/yaw rate from the turn coordinator. Invalid
rate for 1.0 second results in an autopilot disconnect.
2.10.1.2 Heading Select Mode (HDG)
The HDG select mode provides roll FD commands to track the heading bug on the DG or HSI.
The heading datum (err from selected heading) is received from the DG/HSI. The HDG select
mode is activated when the HDG button is pressed and HDG select is not already active.
Activating HDG select cancels any other lateral tracking mode. It remains active if an ARM mode
is selected (such as NAV ARM or APR ARM) until the ARM mode is captured. The HDG select
mode can be deactivated by selecting another lateral mode or by pressing the HDG pushbutton
again.
When in the HDG select mode, the FCC displays "HDG" in the roll coupled field. In the event the
DG becomes invalid for 3.0 seconds, the FCC flashes the "HDG" annunciation and revert to the
roll default mode. The flashing of the HDG select annunciation continues until canceled by
pressing the HDG pushbutton or until another lateral mode has been selected. Upon deactivation
of the flashing, the current selected mode is annunciated.
2.10.1.3 NAV Sensor Selection
The KAP 140 recognizes three types of navigation sensors: VOR, Localizer (ILS), and GPS (or
other long--range sensor). This is accomplished by two discrete inputs to the FCC: ILS Energize
and GPS Select, according to the following table. If the selected sensor changes when NAV, APR,
or REV modes are selected (including ARM modes), the mode will be canceled. If the coupled
mode changes due to this cancellation, ROL default mode will be engaged. This forces the new
sensor type to be armed before allowing tracking.
GPS SELECT
Ground
Ground
Open
Open
Revision 2, Dec/2002
CS:15574F02.IDU
BENDIX/KING
KAP 140
ILS ENERGIZE
Ground
Open
Ground
Open
SELECTED SENSOR
GPS Approach
GPS Enroute
Localizer (ILS)
VOR
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