Diamond DA 42 NG, Maintenance Manual

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AIRCRAFT
DA 42 NG AMM Stabilizers
Doc # 7.02.15
Rev. 4
55-20-00
Page 3
15 Mar 2018
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.