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Page 2
20 Sep 2007 55-40-00 Doc # 6.02.01
Rev. 5
Left Shell
Right Shell
Bottom Mounting Bolts
Top Pivot Pin
Insert
Mass Balance
Figure 1: Rudder Assembly
AIRCRAFT
DA 40 Series
AMM
Stabilizers
Doc # 6.02.01
Rev. 5 55-40-00 Page 3
20 Sep 2007
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 installed in a bearing sleeve attached to the rear web of the vertical stabilizer. On the pivot
% pin a bushing and if necessary for adjustment a washer is bonded with Loctite 680. This bushing is
% installed to adjust the clearance between rudder and bearing.
% Figure 2: Clearance Bushing between Rudder and Rudder Bearing
%
AIRCRAFT
Stabilizers
DA 40 Series
AMM
Page 4
20 Sep 2007 55-40-00 Doc # 6.02.01
Rev. 5
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% Figure 3: Rudder Installation
AIRCRAFT
DA 40 Series
AMM
Stabilizers
Doc # 6.02.01
Rev. 5 55-40-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove and install the rudder. Refer to Section 27-20 for
data on the rudder control setting.
% 2. Remove/Install the Rudder and the Upper Bearing
A. Remove the Rudder
Detail Steps/Work Items Key Items
(1) Remove 2 nuts and washers which attach the
rudder to the rudder lower mounting bracket.
% Refer to Figure 3.
Hold the rudder.
(2) Pull the bottom of the rudder aft to disengage the
bottom bolts.
(3) Lower the rudder to disengage the top pivot.
(4) Put the rudder in a stand or on a padded surface.
% B. Remove the Upper Bearing
% Detail Steps/Work Items Key Items
(1) Remove circlip and spacer of the bearing sleeve
% from the top side.
%
(2) Remove the bearing in an upward direction by
% pushing from the bottom side.
%
% C. Install the Upper Bearing
% Detail Steps/Work Items Key Items
(1) Press bearing into bearing sleeve from the top
% side.
%
(2) Install spacer and circlip into bearing sleeve from
% the top side.
%
AIRCRAFT
Stabilizers
DA 40 Series
AMM
Page 202
20 Sep 2007 55-40-00 Doc # 6.02.01
Rev. 5
% D. Install the Rudder
Detail Steps/Work Items Key Items
(1) Put the rudder in position aft of the vertical
stabilizer rear web.
% (2) Check the bushing is installed and bonded on
% pivot.
(3) Align the top pivot pin with the bearing in the top
face of the rear web. Lift the rudder to engage the
top pivot pin.
(4) Move the bottom of the rudder forward to engage
the bottom mounting bolts in the holes in the
rudder lower mounting bracket.
% (5) Check clearance between top of bushing and the
% bottom of the bearing. Adjust if necessary.
1.6 mm to 3.2 mm (1/16" to 1/8")
(6) Install the washers and nuts on the bottom
mounting bolts.
Torque: 6.4 Nm (4.7 ft.lb).
(7) Do a test for correct range of movement of the
rudder control.
Refer to Section 27-20.
AIRCRAFT
DA 40 Series
AMM
Stabilizers
Doc # 6.02.01
Rev. 5 55-40-00 Page 203
20 Sep 2007
2 34 5 6
9 10
2
9 11
3
4
5
6
Item
No.
Layers Reference No. Type Remarks
2 2 8.4548.60 Glass twill 2/2 ±45º
3 6 8.4548.60 Glass twill 2/2 ±45º, 120 mm x 120 mm
4 4 8.4548.60 Glass twill 2/2 ±45º, 200 mm x 150 mm
5 1 8.4525.60 Glass uni-directional 0º/180º, 100 mm x 920 mm
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