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20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to test the elevator trim control system. They also tell you how
to adjust the system. Refer to Section 55-20 for data on how to remove and install the elevator and trim
tab.
2. Elevator Trim Control System Test for Correct Range of Movement
A. Equipment
Item Quantity Part Number
Control clamp. 1 Commercial.
Inclinometer. 1 Commercial.
Fuselage trestle. 1 Commercial.
B. Elevator Trim Control Test Procedure
Note: Make sure that the airplane does not move in pitch during the procedure. It will cause
errors in the test.
Detail Steps/Work Items Key Items/References
(1) Make a copy of the Control Surfaces Adjustment
Report.
Refer to Section 06-00.
Use it to record the measurements.
(2) Put a trestle under the rear fuselage. To prevent movement in pitch.
(3) Hold the trailing edge of the elevator in line with
the horizontal stabilizer
Use a clamp at the tips.
(4) Set the trim handwheel to neutral.
Note: Use an inclinometer to make all measurements at the trim tab surface. Make the
measurement at the center.
(5) Put the inclinometer on the top surface of the trim
tab. Set the inclinometer to zero.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Detail Steps/Work Items Key Items/References
Page 202
20 Sep 2007 27-38-00 Doc # 6.02.01
Rev. 5
(6) Set the trim handwheel to fully NOSE DOWN.
(7) Measure the angle of the top surface of the trim
tab.
Record the angle of the top surface of
the trim tab.
The angle must be as shown in the
Control Surfaces Adjustment Report.
(8) Set the trim handwheel to fully NOSE UP.
(9) Measure the angle of the top surface of the trim
tab.
Record the angle of the top surface of
the trim tab.
The angle must be as shown in the
Control Surfaces Adjustment Report.
(10) Remove the trestle under the rear fuselage.
3. Elevator Trim Control System Adjustments
If you cannot get the correct range of movement of the elevator trim control system, use this procedure
to adjust the system.
A. Equipment
Item Quantity Part Number
Inclinometer. 1 Commercial.
Control clamp. 1 Commercial.
Fuselage trestle. 1 Commercial.
Spring balance. 1 Commercial.
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-38-00 Page 203
20 Sep 2007
B. Elevator Trim Control Adjustment Procedure
Detail Steps/Work Items Key Items/References
(1) Remove these items for access:
S The pilots’ seats.
S The center console cover.
Refer to Section 25-10.
(2) Put a trestle under the rear fuselage. To prevent movement in pitch.
(3) Hold the trailing edge of the elevator in line with
the horizontal stabilizer.
Use a clamp at the tips.
(4) Set the trim indicator to neutral.
(5) Adjust the flexible cable:
S Loosen the nuts which hold the outer sheath
of the flexible cable to the mounting frame for
the trim handwheel.
S Turn the nuts to move the outer sheath
forward of aft as necessary.
S Tighten the nuts.
Refer to Figure 1.
Move the outer sheath forward to move
the trim tab down. Move the outer
sheath aft to move the trim tab up.
(6) Do a test for the correct range of movement of
the trim tab.
Refer to Paragraph 2.
(7) Do an inspection of all the controls that you have
adjusted.
S If necessary for your Airworthiness Authority,
do a second inspection of the controls.
(8) Install these items:
S The pilots' seats.
S The center console cover.
Refer to Section 25-10.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 204
20 Sep 2007 27-38-00 Doc # 6.02.01
Rev. 5
C. Elevator Trim Friction Damper Adjustment Procedure
Detail Steps/Work Items Key Items/References
(1) Remove the horizontal stabilizer fairing. Refer to Section 55-10.
(2) Disconnect the right actuator lever from the
friction rod:
S Release the spring locking clip from the ballstud.
S Pull the end fitting away from the stud.
(3) Measure the force needed to move the damper
rod.
Use a spring balance.
The friction force must be 15 - 30 N (3.4
- 6.7 lb).
(4) If necessary, adjust the friction force:
S Tighten or loosen the clamping screw a small
amount.
(5) Do items 3 and 4 again as necessary.
(6) Connect the right actuator lever to the friction rod:
S Push the end fitting onto the stud.
S Install the spring locking clip in the ball-stud.
(7) Do an inspection of all the controls that you have
　
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