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The airplane is equipped with standard wing tip navigation lights with
integral anti-collision strobe lights. The separately controlled landing
light is located in the lower cowl.
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 5-amp NAV LIGHTS circuit breaker on Non-Essential Bus.
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 Non-Essential Bus.
Landing Light
Serials 1337 and subsequent with SRV standard configuration: The
airplane is equipped with a Halogen landing light.
A 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.
Setting the LAND light switch ’on’ energizes the landing light control
relay in the Master Control Unit (MCU) completing a 28 VDC circuit
from the airplane Main Distribution Bus to the light’s ballast located on
the firewall. The ballast provides boosted voltage to illuminate the HID
lamp. A 15-amp breaker on the Main Distribution Bus in the MCU
protects the circuit
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 instrumentation and avionics equipment lights are dimmable.
March 2010
Information Manual 7-77
Cirrus Design Section 7
SR20 Airplane Description
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 supplied through 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
brightness. The panel lights operate on 28 VDC supplied through the
3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
Reading Lights
• Note •
Serials 1337 and subsequent with SRV standard configuration:
Reading lights are not installed on this airplane.
Individual eyeball-type reading lights are installed in the headliner
above each passenger position. Each light is aimed by positioning the
lens in the socket and is controlled by a push-button switch located
next to the light. The pilot and copilot reading lights are also dimmable
through the PANEL lights control on the instrument panel bolster. The
lights are powered by 28 VDC supplied through the 3-amp CABIN
LIGHTS circuit breaker on Main Bus 2.
Overhead Dome Light
General cabin lighting is provided by a dome light located in the
headliner at the approximate center of the cabin. The dome light is
controlled through the OVERHEAD light control on the instrument
panel bolster. Rotating the knob clockwise from the off position will
illuminate the light and control its intensity. The lights are powered by
28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on
Main Bus 2.
March 2010
7-78 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Environmental System
Cabin heating and ventilation is accomplished by supplying
conditioned air for heating and windshield defrost and fresh air for
ventilation. The basic environmental system consists of a heater muff
(heat exchanger) around the right engine exhaust muffler, fresh air
inlets(s), hot air valve, distribution manifold, air ducting for distribution
windshield diffuser, vent outlets, and required actuators for selecting
temperature and flow. Serials 1637 and subsequent; An optional 3-
speed blower fan is available to supplement airflow when ram air may
be inadequate such as during ground operation.
Description and Operation - Serials 1005 through 1636
　
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