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Wings
The wing structure is constructed of composite materials producing
wing surfaces that are smooth and seamless. The wing cross section
is a blend of several high performance airfoils. A high aspect ratio
results in low drag. Each wing provides attach structure for the main
landing gear and contains a 30.25-gallon fuel tank.
The wing is constructed in a conventional spar, rib, and shear section
arrangement. The upper and lower skins are bonded to the spar, ribs,
and shear sections (rear spars) forming a torsion box that carries all of
the wing bending and torsion loads. The wing spar is manufactured in
one piece and is continuous from wing tip to wing tip. The shear webs
(rear spars) are similar in construction but do not carry through the
fuselage. The main wing spar passes under the fuselage below the
two front seats and is attached to the fuselage in two locations. The
rear shear webs are attached to the fuselage sidewalls just aft of the
rear seats.
March 2010
Information Manual 7-7
Cirrus Design Section 7
SR20 Airplane Description
Empennage
The empennage consists of a horizontal stabilizer, a two-piece
elevator, a vertical fin and a rudder. All of the empennage components
are conventional spar (shear web), rib, and skin construction.
The horizontal stabilizer is a single composite structure from tip to tip.
The two-piece elevator, attached to the horizontal stabilizer, is
aluminum.
The vertical stabilizer is composite structure integral to the main
fuselage shell for smooth transfer of flight loads. The rudder is
aluminum and is attached to the vertical stabilizer rear shear web at
three hinge points.
March 2010
7-8 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Flight Controls
The SR20 uses conventional flight controls for ailerons, elevator and
rudder. The control surfaces are pilot controlled through either of two
single-handed side control yokes mounted beneath the instrument
panel. The location and design of the control yokes allow easy, natural
use by the pilot. The control system uses a combination of push rods,
cables and bell cranks for control of the surfaces.
Roll trim and pitch trim are available through an electric button on the
top of each control yoke.
Elevator System
The two-piece elevator provides airplane pitch control. The elevator is
of conventional design with skin, spar and ribs manufactured of
aluminum. Each elevator half is attached to the horizontal stabilizer at
two hinge points and to the fuselage tailcone at the elevator control
sector.
Elevator motion is generated through the pilot’s control yokes by
sliding the yoke tubes forward or aft in a bearing carriage. A push-pull
linkage is connected to a cable sector mounted on a torque tube. A
single cable system runs from the forward elevator sector under the
cabin floor to the aft elevator sector pulley. A push-pull tube connected
to the aft elevator sector pulley transmits motion to the elevator
bellcrank attached to the elevators.
March 2010
Information Manual 7-9
Cirrus Design Section 7
SR20 Airplane Description
SR20_FM07_1461
Figure 7-1
Elevator Control System
March 2010
7-10 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Aileron System
The ailerons provide airplane roll control. The ailerons are of
conventional design with skin, spar and ribs manufactured of
aluminum. Each aileron is attached to the wing shear web at two hinge
points.
Aileron control motion is generated through the pilot’s control yokes by
rotating the yokes in pivoting bearing carriages. Push rods link the
pivoting carriages to a centrally located pulley sector. A single cable
system runs from the sector to beneath the cabin floor and aft of the
rear spar. From there, the cables are routed in each wing to a vertical
sector/crank arm that rotates the aileron through a right angle conical
drive arm.
March 2010
Information Manual 7-11
Cirrus Design Section 7
SR20 Airplane Description
SR20_FM07_1462
Figure 7-2
Aileron Control System
March 2010
7-12 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Rudder System
The rudder provides airplane directional (yaw) control. The rudder is of
conventional design with skin, spar and ribs manufactured of
aluminum. The rudder is attached to the aft vertical stabilizer shear
web at three hinge points and to the fuselage tailcone at the rudder
control bell crank.
Rudder motion is transferred from the rudder pedals to the rudder by a
　
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