4. Repair Data for the Elevator Shells
Figure 4 shows the layers of glass fiber cloth in the elevator shells. Use this data when you need to repair the elevator.
The Figures show the main layers of cloth. The cross-hatching on the Figure shows the orientation of the fibers. The orientation is also given in the related table. When you repair the elevator, you must use the same type of cloth with the same fiber orientation.
The numbers in circles beside each drawing give the order in which the layers are applied (‘Stages’). The first stage is a layer of filler and is not shown. Stage 1 is the outer face of the shell.
Always do a burn test on a piece of composite from the damaged area before you do a repair. Refer to Section 51-20 for the burn test.
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Section 55-30
Lower Fin

1. General
The DA 40 has a removable lower fin. The lower fin is a GFRP molding. Screws attach the lower fin to the bottom of the rear fuselage.
2. Description
The lower fin is a GFRP molding. It has a left shell and a right shell. The shells bond together with resin.
The lower fin has a hole at the rear for a tie down rope. It also has a flat area at the bottom for a tail skid.
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Figure 1: Lower Fin
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Maintenance Practices
1. General
These maintenance practices tell you how to remove and install the lower fin.
2. Remove/Install the Lower Fin
A. Remove the Lower Fin
Detail Steps/Work Items  Key Items 
(1)  Remove the sealing tape from the joint between the lower fin and the fuselage. 
(2)  Remove 5 screws which attach the lower fin to the rear fuselage.  Refer to Figure 1. Hold the fin. 
(3)  Remove the lower fin from the airplane. 

B. Install the Lower Fin
Detail Steps/Work Items  Key Items 
(1)  Clean the area of the fuselage where the lower fin attaches. 
(2)  Put the lower fin in position below the fuselage.  Hold the lower fin. 
(3)  Install the 5 screws with washers which attach the lower fin. 
(4)  Apply sealing tape to the joint between the lower fin and the fuselage. 

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Section 55-40
Rudder

1. General
The DA 40 has the usual rudder. The rudder attaches to the rear web of the vertical stabilizer. See Section 27-20 for data about the rudder controls.
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Figure 1: Rudder Assembly
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2. Description
Figure 1 shows the rudder structure. Figure 2 shows the installation of the rudder on the vertical stabilizer.
The rudder has left and right shells. Each shell has GFRP skins with a rigid foam core. The leading edge of each shell has a curve and a flange. The shells bond together at the flanges. The shells also bond together at the top, bottom and at the trailing edge.
The rudder has a flat face at the bottom of the leading edge. The flat face has two bonded bolts. The bolts attach the rudder to the rudder lower mounting bracket. Refer to Section 27-20 for data about the rudder lower mounting bracket.
The rudder has a mass balance weight bonded into the leading edge near the top. You cannot adjust the mass balance.
Two bearings hold the rudder. A pivot pin bonds into the leading edge near the top. It engages with a bearing attached to the rear web of the vertical stabilizer. The rudder lower mounting bracket has the bottom bearing.
　
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