Searey LSA – Pilot’s Operating Handbook Version 5.0, Revision 8
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torque tube which rises vertically, immediately in front of the forward main
pylon structure and is located just aft of the front wing spar attachment.
This torque tube extends from the bottom of the fuselage to a nylon
bearing which is located on the underside of the square aluminum tube
which is attached to the main pylon section and to which the wings attach.
The torque tube has a horn at the upper end. This is connected by a
push-pull tube to a horn that exits the wing. Inside the wing is a torque
tube that runs out to about half the semi-span. This is supported by nylon
bearings. The outer end of the wing torque tube is fitted with another
horn that connects to the aileron horn via a push-pull rod.
7.3.4 VERTICAL FIN
The lower end of the leading edge tube and rudder posts plug into holes in
the end of the tail boom aluminum tube. These are secured with AN bolts.
The vertical fin is secured by tensioned stainless steel cable bracing that
spans from the leading edge and aft vertical post of the fin to the outside
edges of the stabilizer.
7.3.5 RUDDER
The rudder pedals are connected directly to the rudder by a stainless
steel cable system, which runs down each side of the main fuselage tube
structure. The rear sections of the cables run inside pulleys and plastic
sleeves that act as guides.
7.3.6 STABILIZER
The stabilizer is attached to the vertical fin by small brackets,
approximately 6” above the main fuselage tube. Additionally, the
stabilizers are secured by stainless steel cable bracing that is bolted to
the vertical fin and the underside of the main fuselage boom tube. The
leading edge of the stabilizer is also connected to four cables that support
the horizontal stabilizers.
7.3.7 ELEVATORS
An aluminum push-pull tube actuates the elevators. This tube runs
straight back from the control stick assembly to the elevator horn. The
push rod exits the rear of the fiberglass hull where a rubber boot is
provided to seal the opening at the transom. Individual left and right rods
then connect to the elevators.
7.3.8 ELECTRIC TRIM SYSTEM
An electric actuator anchored to the airframe connects to the elevator
push rod through a spring assembly that can put adjustable tension in
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