Figure 4: Layers of Cloth in the Horizontal Stabilizer Top Shell
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Section 55-20
Elevator
1. General
The DA 40 has the usual elevator. The elevator attaches to the rear web of the horizontal stabilizer. See Section 27-30 for data about the elevator controls.
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Figure 1: Elevator Structure
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2. Description
Figure 1 shows the elevator structure. Figure 2 shows the installation of the elevator on the horizontal stabilizer. Figure 3 shows the trim tab installation.
The elevator has top and bottom shells. Each shell has GFRP skins with a rigid foam core. The leading edge of each shell has a curve. The shells bond together where the curves overlap. The shells also bond together at the ends and at the trailing edge.
The elevator has a horn rib in the middle. It is a strong box with an open front. The elevator horn goes into the horn rib. Two bolts attach the horn to the elevator.
The horn has a hole with a bush for the elevator push rod. The front of the horn has elevator mass balance weight. More mass balance weight is attached at the front of the elevator tips.
Five bearings hold the elevator. The elevator horn has a plain bearing. A bolt and spacer attach the elevator horn to the trailing edge webs of the horizontal stabilizer.
A small bearing rib at mid-span on each side holds an elevator hinge assembly. The hinge assembly has an eye-end with a plain shank. The eye-end has a spherical bearing. The shank engages in a bush in the trailing edge web.
The outer end of the elevator on each side has an end bearing. A reinforcing block holds a bonded bush. The bush aligns with a bonded bush in the horizontal stabilizer trailing edge web. A pivot pin goes through both bushes to make the outer bearing. A roll pin locks the pivot pin in the bonded bush.
A GFRP trim tab attaches to the trailing edge of the elevator. The trim tab has six GFRP hinges. The front half of each hinge bonds to the trailing edge of the elevator. The rear half of each hinge bonds to the leading edge of the trim tab. Two hinge rods go through the hinges. Lock wires hold the hinge rods in place.
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Figure 2: Elevator Installation on the Horizontal Stabilizer
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Maintenance Practices
1. General
These maintenance practices tell you how to remove and install the elevator and trim tab. Refer to Sections 27-30 and 27-31 for data on the elevator and trim tab control setting.
2. Remove/Install the Elevator
A. Remove the Elevator
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) Remove the horizontal stabilizer tips.
(4) Remove 2 bolts, nuts and washers which attach the elevator horn rib to the elevator. Refer to Figure 2.
(5) Remove the pivot pins from the end bearings: S Remove the roll pin. S Pull the pivot pin out of the end bearing. Hold the elevator.
(6) Pull the elevator aft to release the elevator horn and hinge assemblies.
(7) Put the elevator in a stand or on a padded surface.
Doc # 6.02.01 Page 201
Rev. 4 09 Jan 2003
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AIRCRAFT AMM
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