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Section 5 - Performance
No change from basic Handbook.
Section 6 - Weight & Balance
No change from basic Handbook.
Section 7 - Systems Description
• Note •
This supplement provides a general description of the Garmin
GNS 430, its operation, and SR20 interface. For a detailed
description of the GNS 430 and full operation instructions refer
to the Garmin GNS 430 Pilot's Guide and Reference, P/N 190-
00140-00, Revision F dated July 2000 (or later appropriate
revision).
The following paragraphs describe a single GARMIN GNS
430 unit and its functions. In the event a second GNS 430 is
installed, the second unit will function as described below
except that the GPS navigator is designated GPS 2, the NAV
receiver is designated NAV 2, and the VHF communications
receiver is designated COM 2. The GPS 2 GPS navigator and
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Supplements SR20
VHF NAV is powered by 28 VDC through the Avionics Master
Switch and the 5-amp GPS2 circuit breaker on the Avionics
Non-essential Bus. 28 VDC for transceiver operation is
supplied through the Avionics master Switch and the 7.5-amp
COM2 circuit breaker on the Avionics Non-Essential Bus.
GNS 430 Integrated GPS/NAV/COM System
This airplane is equipped with a GNS 430 integrated GPS navigator,
NAV receiver, and COM transceiver. The GPS navigator consists of a
GPS receiver, a navigation computer, and a Jeppeson NavData
database all contained in the GNS 430 control unit mounted in the
center console. The GPS is designated ‘GPS 1.’ A VHF NAV receiver
and tuner for receiving VHF Omnirange (VOR), Localizer (LOC), and
Glideslope (G/S) is also integrated into the control unit. The NAV
receiver is designated ‘NAV 1.’ Additionally, a VHF communications
receiver, designated ‘COM 1,’ is also integrated into the unit. All tuning
and display controls for the GPS, NAV, and COM are located in the
GNS 430 control/display in the center console. The following
paragraphs describe the GPS, NAV, and COM functions of this unit.
For a complete description, as well as full operating instructions, refer
to the Garmin GNS 430 Pilot’s Guide and Reference.
GPS Navigator
The Garmin GNS 430 GPS navigator is the primary system (GPS 1),
is IFR certified, and is coupled to the airplane’s HSI (or HSI) and MFD.
Normally, the second GPS Navigator provides backup and is approved
for VFR use only. If the second GPS is also a Garmin 430, it will be
coupled to the CDI and is also approved for IFR use. The Garmin GPS
430 is capable of providing IFR enroute, terminal, and approach
navigation with position accuracies better than 15 meters. The system
utilizes the Global Positioning System (GPS) satellite network to derive
the airplane’s position (latitude, longitude, and altitude) and the
altitude digitizer to enhance the altitude calculation. The GPS 1
antenna is located beneath the cabin roof along the airplane centerline
and the GPS 2 antenna is located under the glareshield. All GPS
navigator controls and functions are accessible through the GNS 430
front control panel located in the center console. The panel includes
function keys, power switches, MSG and Nav status annunciators,
color LCD display, two concentric selector knobs on each panel, and a
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SR20 Supplements
Jeppesen NavData card slot in each panel. The GNS 430 navigator is
powered by 28 VDC through the 5-amp GPS1 circuit breaker on the
Avionics Essential Bus.
The Jeppesen Navigation Database provides access to data on
Airports, Approaches, Standard Instrument Departures (SIDs),
Standard Terminal Arrivals (STARs), VORs, NDBs, Intersections,
Minimum Safe Altitudes, Controlled Airspace Advisories and
Frequencies. North American and International databases are
available. Database information is provided on a card that can be
inserted into the card slot on the GPS unit. Subscription information is
provided in a subscription packet provided with each system.
Navigation (Nav) Receiver
The Garmin GNS 430 provides an integrated Navigation (NAV)
receiver with VHF Omnirange/Localizer (VOR/LOC) and Glideslope
(G/S) capability. The VOR/LOC receiver receives on a frequency
range from 108.000 Mhz to 117.950 Mhz with 50 kHz spacing.
Glideslope is received from 329.150 to 335.00 in 150 kHz steps. The
Nav receiver controls are integrated into the Garmin GNS 430 control
mounted in the center console. The receiver control provides active
and standby frequency indication, frequency memory storage, and
　
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