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Page Date: 19. February 2014
Section 7
Description and Operation of Aircraft and Systems
Pilot´s Operating Handbook US
EXTRA 330LX
7.3
WING
The wing is a CRP construction. The dual chamber main spar - being a fail safe design -
consists of carbon roving caps combined with CRP webs. Core foam is a PVC foam. The
wing shell is built by a Honeycomb sandwich with CRP laminates. Wing box ribs are made of
carbon fiber composite with honeycomb core. The ribs in the nose section are made of wood.
The connection to the fuselage is arranged by two bolts piercing through the spar parallel to
the centerline of the fuselage and two brackets at the rear spars.
The ailerons are supported at four points in spherical bearings. In addition the aileron tip has
a shielded horn balance.
The hinge line of the ailerons is positioned 25% of the aileron chord. Furthermore the ailerons
are equipped with "spades" to decrease pilot's forces. The aileron control push-pull rods are
connected to the aileron at the second bearing point (in span-wise direction). To prevent
flutter the ailerons are mass balanced at the leading edge of the shielded horn.
7.4
EMPENNAGE
The EXTRA 330LX possesses a cruziform empennage with stabilizers and moveable control
surfaces. The rudder is balanced aerodynamically at the tip. Spars consist of PVC foam
cores, CRP caps and CRP laminates. The shell is built using honeycomb sandwich with CRP
laminates.
Deviating from the other control surfaces the spar webs of the surfaces of the elevator is built
by CRP. On the R/H elevator half a trim tab is fitted with two hinges. The control surfaces are
mounted in spherical bearings (exception: trim tab). To prevent flutter rudder and elevator are
mass balanced. The balance weight for the rudder is installed in the nose of the rudder horn
while the balance weights for the elevator are mounted near the outside elevator tips and in
the center position.
Summary of Contents for 330lx
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