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March 2010
Information Manual 7-97
Cirrus Design Section 7
SR20 Airplane Description
receivers and integrated controls are mounted in the Garmin GNS 430
control display. The receiver controls provide active and standby
frequency indication, frequency memory storage, and knob-operated
frequency selection. IDENT audio output for VOR and LOC is provided
to the audio system. The Nav antenna, mounted on top of the vertical
tail, provides VOR/LOC input for both Nav receivers.
NAV 1 – The upper GARMIN GNS 430 is designated NAV 1. 28 VDC
for navigation receiver operation is controlled through the Avionics
Master Switch on the bolster switch panel and supplied through the 5-
amp GPS1 circuit breaker on the Avionics Essential Bus row.
Avionics Configuration 2.2:
The airplane is equipped with two NAV receivers integrated into the
Garmin GNS 430 GPS Navigators. The upper unit is designated NAV
1 and the lower unit is designated NAV 2. The Nav receiver controls
are integrated into the Garmin GNS control mounted in the center
console. Each unit has VHF Omnirange/Localizer (VOR/LOC)
capability. The VOR/LOC receiver receives VOR/LOC on a frequency
range from 108.000 Mhz to 117.950 Mhz with 50 kHz spacing. The
GNS 430 has glideslope capability. Glideslope is received from
329.150 to 335.000 in 150 kHz steps. The receiver control provides
active and standby frequency indication, frequency memory storage,
and knob-operated frequency selection. IDENT audio output for VOR
and LOC is provided to the audio system. The Nav antenna, mounted
on top of the vertical tail, provides VOR/LOC input for both Nav
receivers.
NAV 1 – The upper GARMIN GNS 430 is designated NAV 1. 28 VDC
for navigation receiver operation is controlled through the Avionics
Master Switch on the bolster switch panel and supplied through the 5-
amp GPS1 circuit breaker on the Avionics Essential Bus row.
NAV 2 – The lower GARMIN GNS 430 is designated NAV 2. 28 VDC
for navigation receiver operation is controlled through the Avionics
Master Switch on the bolster switch panel and supplied through the 5-
amp GPS 2 circuit breaker on the Avionics Non-Essential Bus row.
March 2010
7-98 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Transponder
The airplane is equipped with a single Garmin GTX 327 ATC Mode C
(identification and altitude) transponder with squawk capability. The
transponder system consists of the integrated receiver/transmitter
control unit, an antenna, and an altitude encoder. The receiver/
transmitter receives interrogations from a ground-based secondary
radar transmitter and then transmits to the interrogating Air Traffic
Control Center. Digitized altitude information, provided by the altitude
encoder, is plumbed into the airplane static system. The transponder
and integrated controls are mounted in the center console. The
transponder control provides active code display, code selection,
IDENT button, and test functions. A FUNC (function) key allows for
selection of pressure altitude, flight time, count-up timer and
countdown timer modes. The display is daylight readable and dimming
is operator controlled through the INST lights control on the instrument
panel bolster. The transponder antenna is mounted on the underside
of the fuselage just aft of the firewall. 28 VDC for transponder
operation is controlled through the Avionics Master Switch on the
bolster switch panel. 28 VDC for receiver, transmitter, and altitude
encoder operation is supplied through the 2-amp ENCODER/
XPONDER circuit breaker on the Avionics Non-Essential Bus.
Audio System
The airplane is equipped with a Garmin GMA 340 Audio Panel.
Refer to the Garmin GMA 340 Audio Panel Pilot's Operating
Handbook, P/N 190-00149-10 Rev C or later, and the applicable POH
supplement for a more complete description of the autopilot, its
operating modes, and additional detailed operating procedures.
Headset/Microphone Installation
The airplane is equipped with provisions for four noise-canceling
headsets with integrated microphones. The forward
microphone-headsets use remote Push-To-Talk (PTT) switches
located on the top of the associated control yoke grip. The rear
headsets do not have COM transmit capabilities and do not require
PTT switches. The microphone (MIC), headset, and automatic noise
reduction (ANR) power jacks for the pilot and front seat passenger are
located in the map case and similar jacks for the aft passengers are
located on the aft portion of the center console. Audio to all four
March 2010
Information Manual 7-99
Cirrus Design Section 7
　
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