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system description is identical to the Garmin GNS 420 described
below.
March 2010
Information Manual 7-95
Cirrus Design Section 7
SR20 Airplane Description
Standard SRV configuration: The airplane is equipped with one GPS
navigator. The Garmin GNS 420 navigator is designated GPS 1, and
is coupled to the airplane’s Multi-Function display. The GPS navigator
is powered by 28 VDC through the 5-amp GPS 1 and 7.5-amp COM 1
circuit breakers on the Avionics Essential Bus.
Communication (COM) Transceivers
Avionics Configuration 2.0, 2.1, 2.2, and PFD:
Two VHF communications (COM) transceivers are installed to provide
VHF communication. The transceivers and integrated controls are
mounted in the Garmin GNS 430, GNS 420 or GNC 250 XL units. The
transceivers receive all narrow- and wide-band VHF communication
transmissions transmitted within range of the selected frequency. The
antennas pick up the signals and route the communication signals to
the transceivers, which digitize the audible communication signal. The
digitized audio is then routed to the audio control unit for distribution to
the speakers or headphones.
COM 1 – The upper Garmin GNS 430 is designated COM 1. The
Garmin GNS 430 control panel provides COM 1 transceiver active and
standby frequency indication, frequency memory storage, and knoboperated
frequency selection. The COM 1 transceiver provides either
720-channel (25 kHz spacing) or 2280-channel (8.33 kHz spacing)
operation in a frequency range from 118.000 to 136.975 MHz. The
COM 1 antenna is located above the cabin on the airplane centerline.
28 VDC for COM 1 transceiver operation is controlled through the
Avionics Master Switch on the bolster switch panel and supplied
through the 7.5-amp COM 1 circuit breaker on the Essential Avionics
Bus.
COM 2 – The lower Garmin GNS 420 or GNC 250 XL is designated
COM 2. The Garmin GNS control panel provides COM 2 transceiver
active and standby frequency indication, frequency memory storage,
and knob-operated frequency selection. The COM 2 transceiver
provides either 720-channel (25 kHz spacing) or 2280-channel (8.33
kHz spacing) operation in a frequency range from 118.000 to 136.975
MHz. The COM 2 antenna is located on the underside of the cabin on
the airplane centerline. 28 VDC for COM 2 transceiver operation is
controlled through the Avionics Master Switch on the bolster switch
March 2010
7-96 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
panel and supplied through the 7.5-amp COM 2 circuit breaker on the
Non-Essential Avionics Bus.
Avionics Configuration SRV:
Optional SRV configuration: An optional Garmin GNS 430 GPS
transceiver is available as an upgrade to the Garmin GNS 420. The
system description is identical to the Garmin GNS 420 described
below.
One VHF communications (COM) transceiver is installed to provide
VHF communication. The transceiver and integrated controls are
mounted in the Garmin GNS 420 unit. The transceiver receives all
narrow- and wide-band VHF communication transmissions transmitted
within range of the selected frequency. The antenna picks up the
signals and routes the communication signals to the transceiver, which
digitize the audible communication signal. The digitized audio is then
routed to the audio control unit for distribution to the speakers or
headphones.
COM 1 – The Garmin GNS 420 is designated COM 1. The Garmin
GNS 420 control panel provides COM 1 transceiver active and
standby frequency indication, frequency memory storage, and knoboperated
frequency selection. The transceiver provides either 720-
channel (25 kHz spacing) or 2280-channel (8.33 kHz spacing)
operation in a frequency range from 118.000 to 136.975 MHz. The
COM 1 antenna is located above the cabin on the airplane centerline.
28 VDC for COM 1 transceiver operation is controlled through the
Avionics Master Switch on the bolster switch panel and supplied
through the 7.5-amp COM 1 circuit breaker on the Essential Avionics
Bus.
Navigation (Nav) Receiver
Avionics Configuration 2.0, 2.1, 2.2, and PFD:
The airplane is equipped with one NAV receiver integrated into the
Garmin GNS 430 GPS Navigators (the GNS 420 or GNC 250XL do
not incorporate a NAV receiver). Mounted in the upper radio rack slot,
this unit is designated NAV 1. The GNS 430 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
　
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