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protected by 15-amp AVIONICS circuit breakers connected to the
respective bus through relays energized by the AVIONICS switch.
In addition to the individual circuit breakers, 25-amp fuses located on
the primary bus in the Master Control Unit (MCU) protect the Main Bus
1, Main Bus 2, and the Non-Essential Bus. Additionally, 15-amp fuses
protect the landing light and standby vacuum pump circuits. The clock
is continuously powered through a 5-amp fuse connected to the
primary bus in the MCU.
Ground Service Receptacle
A ground service receptacle, located just aft of the cowl on the left side
of the airplane, is installed to permit the use of an external power
source for cold weather starting and maintenance procedures
requiring reliable power for an extended period. The external power
source must be regulated to 28 VDC. The external power control
contactor is wired through the BAT MASTER switch so that the BAT
MASTER must be 'on' to apply external power.
Refer to Section 8, Ground Handling, Servicing, and Maintenance, for
use of external power and special precautions to be followed.
Convenience Outlet
A 12-volt convenience outlet is installed in the center console. The
receptacle accepts a standard cigarette-lighter plug. The outlet may be
used to power portable entertainment equipment such as CD players,
cassette players, and portable radios. Amperage draw through the
outlet must not exceed 3.5 amps. 28 VDC power for the convenience
outlet is supplied through the 5-amp CONVENIENCE POWER circuit
breaker on the Non-Essential Bus and reduced to 12 volts by a power
regulator card in the console.
March 2010
Information Manual 7-55
Cirrus Design Section 7
SR20 Airplane Description
Exterior Lighting
The airplane is equipped with standard wing tip and tail-mounted
navigation lights with integral anti-collision strobe lights. The
separately controlled landing light is located in the left cowl inlet.
Navigation Lights
The airplane is equipped with standard wing tip navigation lights. The
lights are controlled through the NAV light switch on the instrument
panel bolster. 28 VDC for navigation light operation is supplied through
the 3-amp NAV LIGHTS circuit breaker on Main Bus 2.
Strobe Light
Anti-collision strobe lights are installed integral with the standard
navigation lights. Each strobe is flashed by a separate power supply.
The strobe power supplies are controlled through the STROBE light
switch on the instrument panel bolster. 28 VDC for strobe light and
control circuits is supplied through the 5-amp STROBE LIGHTS circuit
breaker on Main Bus 2.
Landing Light
A standard Halogen or optional High Intensity Discharge (HID) landing
light is mounted in the lower engine cowl. The landing light is
controlled through the LAND light switch on the instrument panel
bolster.
In the standard (Halogen) installation, setting the LANDING light
switch 'on' energizes the landing light control relay in the Master
Control Unit (MCU) completing a 28 VDC circuit from the airplane
primary bus to the Halogen lamp. A 15-amp circuit breaker on the
primary bus in the MCU protects the circuit.
In the optional (HID) installation, setting the LANDING light switch 'on'
energizes the landing light control relay in the Master Control Unit
(MCU) completing a 28 VDC circuit from the airplane primary bus to
energize the HID ballast, mounted on the forward firewall, which
powers the HID lamp in the cowl. A 15-amp circuit breaker on the
primary bus in the MCU protects the circuit.
March 2010
7-56 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Interior Lighting
Interior lighting for the airplane consists of separately controlled
incandescent overhead lights for general cabin lighting, individual
lights for the pilots and passengers, and dimmable panel floodlights.
The flight instruments and avionics equipment lights are dimmable.
Instrument Lights
Instrument lighting for the airplane consists of dimmable incandescent
lights in the instrument bezels. The lights are controlled through the
INST lights control on the instrument panel bolster. Rotating the knob
clockwise energizes the lights and increases brightness. The
instrument light circuits operate on 28 VDC and are protected by the 2-
amp INST LIGHTS circuit breaker on Main Bus 1.
Panel Flood Lights
A string of red LEDs mounted under the instrument panel glareshield
provide flood lighting for the instrument panel. The lights are controlled
through the PANEL lights control on the instrument panel bolster.
Rotating the knob clockwise energizes the lights and increases
　
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