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has a tie-down point.
2. Description
Figure 1 shows the lower fin. The lower fin is a rigid GFRP molding. Five screws attach the lower
fin to the bottom of the fuselage. The bottom aft corner has a hole for a tie-down rope. Some lower
fins may be filled with ballast made up of lead shot and epoxy.
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Rev. 9
Attaching Screw Holes
Lower Fin
Tie-Down Hole
Figure 1: Lower Fin
DA20-C1 AMM
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MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install the lower fin.
Note: If the lower fin is being replaced and the lower fin contains ballast. Measure weight of
old lower fin. Add ballast to new lower fin to get same weight. Use lead balls and epoxy.
See chapter 51.
2. Remove/Install the Lower Fin
A. Remove the Lower Fin
Detail Steps/Work Items Key Items
(1) Remove the adhesive tape which seals the
joint between the lower fin and the fuselage.
(2) Remove 5 screws which attach the fin to the
fuselage.
Hold the fin!
(3) Remove the lower fin from the airplane.
B. Install the Lower Fin
Detail Steps/Work Items Key Items
(1) Put the lower fin in position under the rear
fuselage.
(2) Install the 5 screws which attach the lower
fin.
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CHAPTER 55-40
RUDDER AND TAB
1. General
The DA20-C1 has the usual rudder. The rudder attaches to the spar of the vertical stabilizer. See
Chapter 27-20 for data about the rudder controls.
2. Description
Figure 1 shows the rudder structure.
The rudder has left and right shells. Each shell has GFRP skins with a rigid foam core. The shells
bond together all around with bonding paste.
The rudder has two pivots. The top pivot pin bonds to the top face of the shells near the leading
edge. The bottom pivot is part of the rudder support-bracket assembly. The rudder lower mounting
plate (also part of the rudder support-bracket assembly) attaches to the bottom of the leading edge.
The rudder has a mass balance weight inside the top part of the leading edge. The mass balance
weight is bonded to the rudder structure during manufacture.
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19 Dec 1997 55-40-00 Doc # DA201-C1
Rev. 0
Figure 1: Rudder Structure
DA20-C1 AMM
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30 Apr 2009
MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install the rudder. See to Chapter 27-20
for adjustment data for the rudder controls.
2. Remove/Install the Rudder
A. Remove the Rudder
Figure 2 shows the rudder installation.
Note: Use two persons to remove the rudder. Or use supports to hold the rudder in
position while you remove/install the attaching bolts.
Detail Steps/Work Items Key Items
(1) Remove 2 nuts and washers which attach
the rudder to the lower mounting plate.
Hold the rudder.
(2) Remove the rudder from the airplane.
Move the bottom of the rudder aft, then
down to release the top pivot.
(3) Inspect the bushing on the pivot rudder pin. Make sure the bushing is not loose or
damage.
Remove and replace bushing when loose
or damaged.
Apply adhesive Loctite 680 to the
replacement bushing and install.
Make sure the bushing is free of adhesive
on the outside surface.
B. Install the Rudder
Detail Steps/Work Items Key Items
(1) Put the rudder in position on the vertical
stabilizer.
Make sure that the top pivot engages the
rudder bearing plate.
(2) Install 2 nuts and washers which attach the
rudder to the lower mounting plate.
Hold the rudder.
Refer to Chapter 20 for standard torque
values.
(3) Do a test for correct, full and free movement
of the rudder control. If necessary, adjust
the rudder control.
Refer to Chapter 27-20.
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Figure 2: Rudder Installation
DA20-C1 AMM
Windows
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30 Apr 2008
CHAPTER 56
WINDOWS
Windows
DA20-C1 AMM
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DA20-C1 AMM
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钻石20系列AMM 2(55)
