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D. Elevator Trim Handwheel Friction Damper 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)  Loosen the self-locking nut on the handwheel pivot bolt.  On the right of the mounting frame. 
(3)  Loosen the locknut for the handwheel friction damper.  Against the right inner face of the mounting frame. 
(4)  Adjust the friction damper nut.  Against the pack of washers and spring washers on the pivot bolt. 
(5)  Measure the friction force.  The friction force must be 200 N (45 lb.). 
(6)  Do items 4 and 5 as necessary. 
(7)  Tighten the locknut for the handwheel friction damper. 
(8)  Tighten the self-locking nut on the handwheel pivot bolt. 
(9)  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. 
(10)  Install these items: S The pilots' seats. S The center console cover.  Refer to Section 25-10. 

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Section 27-39
Stall Warning System

1. General
The DA 40 has a simple mechanical stall warning system.
2. Description and Operation
% Figures 1 and 2 show the stall warning system.
The stall warning horn is located in the instrument panel. A flexible hose connects the stall warning horn to a hole in the leading edge of the left wing. When the angle of attack of the wing is just less than the stall angle, the airflow through the hole operates the horn. A ball-valve in the tube stops air and water flowing from the outside into the cockpit through the stall warning system.
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AIRCRAFT
Stall Warning Horn 
Attaching Screw 
Retaining Ring 
Attaching Nut  Instrument Panel 

Ball Valve
Ty-wrap
Cotter Pin
Flexible Tube from Wing Leading Edge

% Figure 1: Stall Warning System, Installation in Larger Instrument Panels
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% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % Figure 2: Stall Warning System, Installation in Smaller Instrument Panels
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Trouble-Shooting
1. General
The table below lists the defects you could have with the stall warning system. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
Trouble  Possible Cause  Repair 
Stall warning horn does not operate.  Stall warning horn defective. Water frozen in the stall warning system.  Replace the stall warning horn. Drain the water from the stall warning system. 
Stall warning operates too early during stall.  Stall warning horn defective.  Replace the stall warning horn. 

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Maintenance Practices
1. General
These maintenance practices tell you how to remove/install the stall warning horn. They also tell you how to drain water from the stall warning system.
　
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