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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
brakes with the rudder-pedal toe brakes, and then pull the PARK
BRAKE knob aft.
March 2010
7-66 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Figure 7-12
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)
Brake System
March 2010
Information Manual 7-67
Cirrus Design Section 7
SR20 Airplane Description
Electrical System
The airplane is equipped with a two-alternator, two-battery, 28-volt
direct current (VDC) electrical system designed to reduce the risk of
electrical system faults. The system provides uninterrupted power for
avionics, flight instruments, lighting, and other electrically operated
and controlled systems during normal operation.
• Note •
Serials 1337 and subsequent with SRV standard
configuration: The airplane is equipped with a single
alternator, dual battery electrical system. This configuration is
identical to the dual alternator system described below except
components used in conjunction with the secondary alternator
are removed.
Power Generation
Primary power for the SR20 is supplied by a 28-VDC, negative-ground
electrical system. The electrical power generation system consists of
two alternators controlled by a Master Control Unit (MCU) mounted on
the left side of the firewall and two batteries for starting and electrical
power storage.
Alternator 1 (ALT 1) is a belt-driven, internally rectified, 75-amp
alternator mounted on the right front of the engine. Alternator 2 (ALT 2)
is a gear-driven, internally rectified, 20-amp alternator mounted on the
accessory drive at the rear of the engine. ALT 1 is regulated to 28 volts
and ALT 2 is regulated to 28.75 volts. The output from ALT 1 is
connected to the Main Distribution Bus in the MCU through an 80-amp
fuse. The output from ALT 2 is connected to the Essential Distribution
Bus in the MCU through a 40-amp fuse. Both alternators are selfexciting
(not self-starting) and require battery voltage for field
excitation in order to start up - for this reason, the batteries and
alternators should not be turned off in flight.
Battery 1 (BAT 1) is an aviation grade 12-cell, lead-acid, 24-volt, 10-
amp-hour battery mounted on the right firewall. BAT 1 is charged from
the Main Distribution Bus in the MCU. Battery 2 (BAT 2) is composed
of two 12-volt, 7-amp-hour, sealed, lead-acid batteries connected in
series to provide 24 volts. Both BAT 2 units are located in a vented,
acid-resistant container mounted behind the aft cabin bulkhead (FS
March 2010
7-68 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
222) below the parachute canister. BAT 2 is charged from the circuit
breaker panel Essential Bus.
The Master Control Unit (MCU) is located on the left firewall. The MCU
controls ALT 1, ALT 2, starter, landing light, external power, and power
generation functions. In addition to ALT 1 and ALT 2 voltage
regulation, the MCU also provides external power reverse polarity
protection, alternator overvoltage protection, as well as alternator fail
and overcurrent annunciations. Power is distributed to the airplane
circuit panel buses through Main and Essential Buses in the MCU.
During normal operation, the alternators feed their respective
Distribution Bus independently (ALT 1 feeds Main Distribution Bus and
ALT 2 feeds the Essential Distribution Bus). The distribution buses are
interconnected by two 50-amp fuses and a diode. The diode prevents
ALT 2 from feeding the Main Distribution Bus. Additionally, since ALT 2
/ Essential Distribution Bus voltage is slightly higher than ALT 1 / Main
Distribution Bus voltage, ALT 1 will not feed the Essential Distribution
Bus unless ALT 2 fails.
Power Distribution
The power distribution system for the SR20 consists of the Main
Distribution Bus and the Essential Distribution Bus in the MCU and
associated buses in the Circuit Breaker panel. The circuit breaker
panel is located on the left side of the console next to the pilots right
knee.
For normal operation, the Essential Buses in the circuit breaker panel
are powered from the Essential Distribution Bus in the MCU through
25-amp circuit breakers. BAT 2 is connected directly to the Essential
　
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