Maintenance Manual LS4
Issued: May 2011
Copyright DG Flugzeugbau GmbH - any copy or publishing prohibited
Manual valid with the up-to-date cover page only
4.1.3 Rudder
4.1.3.1 Rudder removal
Caution: Rudder cables can be pre-drilled. This must not be changed, otherwise
the rudder neutral position is changed.
- LS4 and LS4-a: Detach inner seals from rudder.
- Disconnect rudder cables, don’t loose spacer bushings.
- remove nut at lower bearing (6 mm thread, LN9348, width over flats 10
mm) using a socket wrench, remember sequence and position of washers.
- Mark rear fin trailing edge with rudder in neutral position at both sides of
upper rudder end using a soft pencil.
- Lift rudder upward from bearings.
- LS4 and LS4-a: Remove internal seals completely,
4.1.3.2 Rudder installation
- LS4-b, LS4 and LS4-a optionally: If necessary install new internal V-
tape seals to both sides of fin analogous to description in section 4.2.5.2.
- Grease bearings according to Lubrication Schedule, see section 3.4.
- Set rudder into bearings from above, do not use force! If both pencil
markings are not visible in neutral rudder position, the upper bearing pin
is located in front of the bearing, not in the bearing!
- Check radial play of upper hinge, max. 0.5 mm <0.02 in.>. If necessary
install a new needle bearing or a new bush. In case a bush is installed
make sure that the possible eccentric position of the bush is kept. Glue in
the bush with Loctite 638.
- Connect rudder cables provisionally, do not forget to insert spacer
bushings into thimbles.
- Check rudder pedal alignment: with pedals in neutral position and rudder
deflected to one side, twist opposite cable clockwise (maximum 5 turns)
until properly aligned.
Should more than 5 turns be required for alignment, replace cables.
Caution: Never turn cables counter clockwise!
- Tighten nuts at rudder cable connection (6 mm thread, LN9348, width
over flats 10 mm) with maximum torque 6.4 Nm (0.64 daNm, 4.7 ft lbs).
- First install the large, then the small washer under the bottom bearing,
then tighten nut with maximum torque of 6.4 Nm (0.64 daNm, 4.7 ft lbs)..
Axial rudder movement should be audible. Maximum axial play 1 mm
(0.04 in).
- LS4 and LS4-a: Fix internal seals on both sides of rudder, see section
4.2.1.
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