Specifications

7-94 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
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. The
secondary GPS navigator is powered by 28 VDC through the 7.5-amp
COM 2 circuit breaker on the Avionics Non-Essential Bus.
Avionics Configuration 2.1 and 2.2:
The airplane is equipped with two GPS navigators. The Garmin GNS
430 is designated GPS 1 and the Garmin GNS 420 (Configuration 2.1)
or an additional GNS 430 (Configuration 2.2) is designated GPS 2.
Both Garmin GPS navigators are IFR certified. The primary unit,
designated GPS 1, is coupled to the airplane’s HSI, Autopilot, and
multifunction display. The secondary unit, designated GPS 2, is
coupled to the airplane’s CDI.
The GPS navigators are capable of providing IFR enroute, terminal,
and approach navigation with position accuracies better than 15
meters. Each GPS navigator utilizes the Global Positioning System
(GPS) satellite network to derive the airplane’s position (latitude,
longitude, and altitude) and the altitude encoder to enhance the
altitude calculation.
The GPS1 antenna is located above the headliner along the airplane
centerline. The GPS2 antenna is located below the glareshield and
behind the MFD. All GPS navigator controls and functions are
accessible through the GPS receiver units’ front control panels located
in the center console. The panels include function keys, power
switches, MSG and NAV status annunciators, a color LCD display
(GNS 430), two concentric selector knobs on each panel, and a
Jeppesen NavData card slot in each panel. The displays are daylight
readable and automatically dimmed for low-light operation. The
primary 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.
The secondary GPS navigator is powered by 28 VDC through the 5-
amp GPS 2 and the 7.5-amp COM 2 circuit breaker on the Avionics
Non-Essential 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.
March 2010