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If the FUEL caution light comes on in flight, refer to the Fuel Quantity
gages to determine fuel quantity. The light is powered by 28 VDC
through the 2-amp ANNUNC circuit breaker on the Essential Bus.
Boost Pump Switch
Boost pump operation and engine prime is controlled through the Fuel
Pump BOOST-PRIME switch located adjacent to the fuel selector
valve. The PRIME position is momentary and the BOOST position is
selectable. A two-speed prime allows the fuel pressure to rapidly
achieve proper starting pressure.
Serials 1005 thru 1227 before SB 20-73-02: For engine starting,
pressing PRIME causes the boost pump to operate at high speed until
the fuel pressure reaches 2-4 psi. When the fuel pressure reaches the
2-4 psi range, a pressure switch in the fuel injection line switches the
boost pump to the low-speed mode to provide a 4-6 psi fuel pressure
boost. Selecting BOOST energizes the boost pump in low-speed
March 2010
Information Manual 7-45
Cirrus Design Section 7
SR20 Airplane Description
mode to deliver a continuous 4-6 psi boost to the fuel flow for vapor
suppression in a hot fuel condition.
Serials 1228 and subs, 1005 thru 1227 after SB 20-73-02: An oil
pressure based system is used to control boost pump operation. The
oil pressure/oil temperature gauge provides a signal to the starting
circuit to generate a ground for the oil annunciator and the fuel system.
This system allows the fuel pump to run at high speed (PRIME) when
the engine oil pressure is less than 10 PSI. Whenever the engine oil
pressure exceeds 10 PSI, pressing PRIME will have no effect.
Selecting BOOST energizes the boost pump in low-speed mode
regardless of oil pressure to deliver a continuous 4-6 psi boost to the
fuel flow for vapor suppression in a hot fuel condition.
The boost pump operates on 28 VDC supplied through the 7.5 amp
FUEL PUMP circuit breaker on Main Bus 1.
March 2010
7-46 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Brake System
The main wheels have hydraulically operated, single-disc type brakes,
individually activated by floor mounted toe pedals at both pilot stations.
A parking brake mechanism holds induced hydraulic pressure on the
disc brake 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, and associated hydraulic
plumbing. 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-H-5606 hydraulic fluid.
Brake system malfunction or impending brake failure may be indicated
by a gradual decrease in braking action after brake application, noisy
or dragging brakes, soft or spongy pedals, excessive travel, and/or
weak braking action. Should any of these symptoms occur, immediate
maintenance is required. If, during taxi or landing roll, braking action
decreases, let up on the pedals and then reapply the brakes with
heavy pressure. If the brakes are spongy or pedal travel increases,
pumping the pedals may build braking pressure.
Refer to Section 10, Safety Information, for Brake System operational
considerations.
March 2010
Information Manual 7-47
Cirrus Design Section 7
SR20 Airplane Description
CALIPER
ASSEMBLY
CALIPER
ASSEMBLY
RUDDER
PEDAL(4)
SR20_FM07_1015
PARKING BRAKE
VALVE
PARKING
BRAKE
KNOB
MASTER CYLINDER(4)
RESERVOIR
MIL-H-5606
FLUID ONLY
ROTOR
(DISK)
ROTOR
(DISK)
Figure 7-9
Brake System
March 2010
7-48 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Parking Brake
• Caution •
Do not pull the PARK BRAKE knob in flight. If a landing is
made with the parking brake valve set, the brakes will maintain
any pressure applied after touchdown.
The main wheel brakes are set for parking by using the PARK BRAKE
knob on the left side of the console near the pilot’s right ankle. Brake
lines from the toe brakes to the main wheel brake calipers are
plumbed through a parking brake valve. For normal operation, the
knob is pushed in. With the knob pushed in, poppets in the valve are
mechanically held open allowing normal brake operation. When the
handle is pulled out, the parking brake valve holds applied brake
pressure, locking the brakes. To apply the parking brake, set the
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