Figure 1: Stabilizers
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Section 55-10
Horizontal Stabilizer

1. General
The DA 40 has the usual horizontal stabilizer. The horizontal stabilizer attaches to the top of the vertical stabilizer. The elevator attaches to the trailing edge of the horizontal stabilizer. See Section 55-20 for data about the elevator structure.
2. Description
Figure 1 shows the horizontal stabilizer structure.
The horizontal stabilizer has top and bottom shells. Each shell has GFRP skins. The top shell has no cut-outs. The bottom shell has a large cut-out at the rear for the elevator horn and mass balance. It also has two smaller holes forward and aft of the front spar.
The horizontal stabilizer has 2 spars. The spars have GFRP skins with rigid GFRP inserts at the main mounting points. They also have top and bottom caps. The ends of the front spar turn back to join the aft spar at mid span. The rear spar goes almost to the tip of the horizontal stabilizer. The spars bond to the top and bottom shells with resin.
Each spar has four holes for a mounting bracket. You can get access to the attachment bolts from below. The mounting brackets go down through the cut-outs in the bottom shell. Four more holes in the bottom part of each mounting bracket attach to the vertical stabilizer front web.
Three pairs of ribs give strength to the center area on each side of the access holes. All are rigid GFRP moldings. They bond to the other components with resin. The rear 'box' ribs make a box round the large cut-out in the bottom skin. A short rear rib at mid-span gives strength to the area between the rear spar and the trailing edge web.
The rear box rib has sides with bends and a top face which joins the sides. It closes the sides of the large cut-out in the bottom shell. The aft part has 3 holes on each side for the anchor bracket for the trim-tab mechanism.
Two trailing edge webs close the trailing edges of the top and bottom shells. The outboard end of each web is a 'J' shape which goes round the outboard balance weight of the elevator. It extends aft at the outer side to close the elevator cut-out. The webs also holds the hinges for the elevator. The webs bond to the top and bottom shells and the rear and rear 'box' ribs with resin.
A rigid GFRP fairing goes around the joint between the horizontal stabilizer and the vertical stabilizer. Four screws attach the fairing to the vertical stabilizer.
Doc # 6.02.01 Page 1
Rev. 4 09 Jan 2003

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Figure 1: Horizontal Stabilizer Structure
Page 2 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Maintenance Practices
1. General
These maintenance practices tell you how to remove and install the horizontal stabilizer.
2. Remove/Install the Horizontal Stabilizer
A. Remove the Horizontal Stabilizer
Note: Use 2 persons to remove/install the horizontal stabilizer.
Detail Steps/Work Items  Key Items 
(1)  Remove the horizontal stabilizer fairing. S Remove 4 screws. 
(2)  Release the 2 ball-end fittings from the trim-tab operating links.  Under the elevator. 
(3)  Release the trim-tab mechanism from its mounting bracket.  Refer to Section 27-31. 
(4)  Move the trim-tab mechanism forward through the hole in the vertical stabilizer web, clear of the mounting bracket. 
(5)  Remove the bolt which connects the elevator vertical push rod to the elevator horn. 
(6)  Remove the 8 bolts which attach the horizontal stabilizer to the front and rear mounting brackets.  Hold the horizontal stabilizer. 
(7)  Disconnect the VOR antenna. 
(8)  Lift the horizontal stabilizer clear of the airplane. 
　
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