Pitch Arm Modes - Honeywell BENDIX/KING KAP 140 Maintenance Manual

2.10.4 PITCH ARM MODES

2.10.4.1 ALTITUDE ARM MODE (ALT ARM)
The Altitude Arm mode determines when Altitude Capture mode should automatically activate,
which captures the selected altitude. The flight crew must initiate a maneuver to fly toward the
preselected altitude (using the VS mode). Upon reaching the altitude capture point, the VS mode
is canceled automatically and the system engages Altitude Capture. The Altitude Arm mode is
activated when the ARM button is pressed and the Altitude Arm mode is not already active. The
Altitude Arm mode also activates automatically after any change in the selected altitude.
Activating Altitude Arm does not cancel any existing pitch coupled mode. When activated, the
Altitude Arm mode can be deactivated by pressing the ARM pushbutton. When in the Altitude Arm
mode, "ALT ARM" is displayed in the pitch arm field.
2.10.4.2 GLIDESLOPE ARM MODE (GS ARM)
When the GS ARM mode is activated, if the GS deviation exceeds the forced capture requirements
of the GS mode, then the GS ARM mode is activated and a compatible pitch coupled mode (i.e.,
VS) can be used to intercept the glidepath. If the GS deviation is sufficiently small, or if the rate
of closure is sufficiently high, GS coupled mode is initiated immediately. When ALT ARM and GS
ARM are both active at the same time, if the altitude capture point is reached first, the altitude
capture and hold mode is activated leaving GS ARM active. However, if glideslope is captured
first, the ALT ARM mode is canceled. The GS Arm mode is activated when the APR coupled mode
is active, GS deviation is valid, and GS coupled mode is not active. The GS arm mode can be
deactivated by disengaging the AP or by canceling the APR coupled mode (see 3.4.3.2.4.1).
When in the GS ARM mode, "GS ARM" is displayed in the roll arm field. In the event the Glideslope
becomes invalid for 10 seconds or the APR coupled mode is deactivated, the GS Arm mode
cancels, leaving the current active pitch coupled mode unchanged.
Revision 2, Dec/2002
CS:15574F02.IDU
BENDIX/KING
KAP 140
Page 2--19