Aileron System - Cirrus DESIGN SR22 Pilot Operating Handbook

Section 7 Cirrus Design
Systems Description SR22

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.
7-10 P/N 13772-002
Reissue A