C
IRRUS
D
ESIGN
S
ECTION
7: A
IRPLANE
AND
S
YSTEMS
SR20
F
LIGHT
C
ONTROLS
P/N 11934-005
7-9
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.
Roll Trim System
Roll trim is provided by adjusting the neutral position of a compression
spring cartridge in the aileron control system by means of an electric
motor. The electric roll trim is also used by the autopilot to position the
ailerons. It is possible to easily override full trim or autopilot inputs by
using normal control inputs.
A ground adjustable trim tab is installed on the right aileron to provide
small adjustments in neutral trim. This tab is factory set and does not
normally require adjustment.
An electric motor changes the neutral position of a spring cartridge
attached to the left actuation pulley in the wing. A conical trim button
located on top of each control yoke controls the motor. Moving the switch
left will initiate left-wing-down trim and moving the switch right will
initiate right-wing-down trim. Neutral trim is indicated by the alignment
of the line etched on the control yoke with the centering indication marked
on the instrument panel. The aileron trim also provides a secondary means
of airplane roll control in the event of a failure in the primary roll control
system not involving jammed ailerons.
Aileron trim operates on 28 VDC supplied through the 2-amp ROLL TRIM
circuit breaker on ESS BUS 2.
Reissue A
