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the altitude alerter reference.)
ARM ) (altitude arm) button (only if altitude preselect option is installed). It toggles altitude arming on
or off. When ALT ARM is annunciated, the autopilot will capture the altitude alerter displayed
altitude (provided the airplane is climbing or descending in VS to the displayed altitude). ALT
hold arming when the autopilot is engaged 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.
AIRCRAFT
Auto Flight DA 40 Series
AMM
Page 8
20 Sep 2007 22-10-00 Doc # 6.02.01
Rev. 5
) BARO (baro set) button (only if Altitude Preselect Option is installed). When pushed and
released, it 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, it 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 if the system configuration
does not employ automatic correction.
The flight control computer is connected to these controls on the control sticks:
) AP DISC (autopilot disconnect) switch on pilot´s and co-pilot´s stick. When pressed, it will
disengage the autopilot, and interrupt electric trim power.
) Manual electric trim switches on the pilot´s stick. When both switches are pressed in the same
direction, they will activate pitch trim in the selected direction. If only one switch is moved, the
trim system will not operate. If one switch fails or is moved and held for 3 seconds, the trim
monitoring system will detect a switch failure resulting in a PT annunciation on the autopilot
display and the disabling of the electric trim system. Autopilot power will have to be cycled to
clear the fault. Use of manual electric trim during autopilot operation will disengage the autopilot.
) CWS (control wheel steering) mode button on the pilot´s stick. When pressed and held, it
disengages the pitch, roll, and pitch trim clutches allowing the pilot to maneuver the airplane by
hand. Pressing the CWS button will also sync the autopilot ALT or VS commands to the actual
altitude or vertical speed present at the time the button is released.
The following controls on the HSI (refer to Section 34-28) are also used for autopilot operation:
) Omni bearing select knob. It selects the desired course to be tracked by the autopilot.
) Heading select knob. It positions the heading bug on the compass card.
AIRCRAFT
DA 40 Series
AMM
Auto Flight
Doc # 6.02.01
Rev. 5 22-10-00 Page 9
20 Sep 2007
B. KCM 100 Configuration Module
The data which is specific to the DA 40 (for example: gain settings) is stored in the KCM 100
configuration module. It is located on the instrument panel floor, between the instrument panel and
the firewall.
C. KS 271C Roll Servo
The roll servo is located behind the rear main bulkhead on the right side. It is mounted on a
mounting plate which is made from sheet aluminum. Two aluminum clamps connect a bridle cable
to the aileron push-rod.
D. KS 270C Pitch Servo
The pitch servo is located aft of the baggage compartment frame. It is mounted on a mounting plate
which is made from sheet aluminum. Two aluminum clamps connect a bridle cable to the elevator
push-rod.
E. KS 272C Pitch Trim Servo
The pitch trim servo is located under the co-pilot's seat. It is mounted on a mounting plate which
is made from sheet aluminum and mounting bracket which is made from GFRP. Servo movement
is transmitted to the trim wheel through a chain gear on the servo, a cardan shaft, and a chain gear
next to the trim wheel on the right side.
AIRCRAFT
Auto Flight DA 40 Series
AMM
Page 10
20 Sep 2007 22-10-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Auto Flight
Doc # 6.02.01
Rev. 5 22-10-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to install the components of the autopilot system. They also
tell you how to test and adjust the autopilot system.
2. Remove/Install the Flight Control Computer
A. Remove the Flight Control Computer
Detail Steps/Work Items Key Items/References
(1) Open the AUTO PILOT circuit-breaker.
(2) Put a 3/32 Allen wrench into the access hole for
the locking screw. Engage the screw.
(3) Turn the screw counter-clockwise until the unit
disengages from the mounting rack.
　
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