CHAPTER 27
PAGE 16
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 16. June 2008
27-20-00 RUDDER
Description and Operation
(Refer to Figure 14) The rudder pedals (1) are connected via
a cable system (2) to the bottom hinge bellcrank (3). The
cables are guided by fairleads. Pedal retracting springs keep
the cables under tension when they are not operated. Adjust-
ment is made by an electrical actuator. The rudder (4) is
mounted at three points in spherical bearings pressed into a
aluminium hinge resp. into aluminium hinge arms. For light-
ning protection reason each hinge (arm) is grounded to the
corresponding attachment bracket at the rudder by bonding
leads. A travel stop plate is located at the bottom hinge
bracket. A second safety stop is located at the rudder pedal
bearing having the only purpose of protecting the lower
brake system fitting in case of rudder cable failure.
C A U T I O N This second stop must not be reached under normal
operation conditions. Missallignment or exessive elon-
gation of the rudder cabels will result in misuse of this
second stop and a subsequent overload of the rudder
bearing. An subsequent inflight failure of the footrest
could occur.
To prevent flutter the rudder is mass balanced. The mass
balance weight of the rudder is installed in the rudder horn.
Maintenance Practices
I M P O R T A N T Perform checks 10-11 of "Flight Controls" presented
in Chapter 05-20-04 after each maintenance work af-
fecting the rudder control cables.
Removal/Installation
1 Disconnect the rudder control cables from the bottom hinge
bellcrank.
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