C
IRRUS
D
ESIGN
S
ECTION
7: A
IRPLANE
AND
S
YSTEMS
SR20
L
ANDING
G
EAR
P/N 11934-005
7-25
Landing Gear
Main Gear
The main landing gear are bolted to composite wing structure between the
wing spar and shear web. The landing gear struts are constructed of
composite material for fatigue resistance. The composite construction is
both rugged and maintenance free. The main wheels and wheel pants are
bolted to the struts. Each main gear wheel has a 15 x 6.00 x 6 tubeless tire
installed. Standard wheel pants are easily removable to provide access to
tires and brakes. Access plugs in the wheel pants can be removed to allow
tire inflation and pressure checking. Each main gear wheel is equipped with
an independent, hydraulically operated single cylinder, dual piston, disc
brake.
Nose Gear
The nose gear strut is of tubular steel construction and is attached to the
steel engine mount structure. Nose gear shock absorption is provided by an
oleo strut. The nose wheel is free castering and can turn through an arc of
approximately 170 degrees (85 degrees either side of center). Steering is
accomplished by differential application of individual main gear brakes.
Each nosewheel has a 5.00 x 5 tubeless tire installed.
Brake System
The main wheels have hydraulically operated, single-disc type brakes, indi-
vidually activated by floor mounted toe pedals at both pilot stations. A
parking brake mechanism holds induced hydraulic pressure on the disc
brakes for parking. The brake system consists of a master cylinder for each
rudder pedal, a hydraulic fluid reservoir, a parking brake valve, a single disc
brake assembly on each main landing gear wheel, temperature sensors, and
associated hydraulic plumbing and wiring.
Braking pressure is initiated by depressing the top half of a rudder pedal
(toe brake). The brakes are plumbed so that depressing either the pilot’s or
copilot’s left or right toe brake will apply the respective (left or right) main
wheel brake. The reservoir is serviced with MIL-PRF-87257 hydraulic fluid.
Brake system malfunction or impending brake failure may be indicated by
a gradual decrease in braking action after brake application, noisy or drag-
ging brakes, soft or spongy pedals, excessive travel, and/or weak braking
action. A temperature sensor is mounted to each brake assembly and
provides measured brake temperatures to the avionics system for caution
and warning annunciation.
Reissue A