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AMM
DA 40 Series
Detail Steps/Work Items Key Items/References
(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.
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Flight Controls
AMM
B. Elevator Trim Control Adjustment Procedure
DA 40 Series
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.
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AMM
C. Elevator Trim Friction Damper Adjustment Procedure
DA 40 Series
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 ball-stud. 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 adjusted. S If necessary for your airworthiness authority, do a second inspection of the controls.
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