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Deactivate GPS
1. Navigator Com/ Power Switch .......................... Rotate CCW ‘OFF’
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 GNC 420, its operation, and SR20 interface. For a
detailed description of the GNC 420 and full operation
instructions refer to the GARMIN GNC 420 Pilot's Guide and
Reference, P/N 190-00140-20, Revision B dated August 2002
(or later appropriate revision).
GNC 420 Integrated GPS/COM System
This airplane is equipped with a GNC 420 integrated GPS navigator
and COM transceiver. The GPS navigator consists of a GPS receiver,
a navigation computer, and a Jeppeson NavData database all
contained in the GNC 420 control unit mounted in the center console.
The GPS is designated ‘GPS 2.’ Additionally, a VHF communications
receiver, designated COM 2, is also integrated into the unit. All tuning
and display controls for the GPS and COM are located in the GNC 420
control/display in the center console. The following paragraphs
describe the GPS and COM functions of this unit. For a complete
description, as well as full operating instructions, refer to the GARMIN
GNC 420 Pilot’s Guide and Reference.
Revision 02: 08-15-07
6 of 8 P/N 11934-S23
Section 9 Cirrus Design
Supplements SR20
GPS Navigator
The GARMIN GNC 420 GPS navigator is the secondary system (GPS
2), is IFR certified, and is coupled to the airplane’s CDI. The GARMIN
GNC 420 GPS navigator 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 2 antenna is located under the glareshield along
the airplane centerline. All GPS navigator controls and functions are
accessible through the GNC 420 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 Jeppesen NavData card slot in
each panel.
Serials 1005 thru 1267; The GNC 420 navigator is powered by 28
VDC through the 5-amp GPS2 circuit breaker on the Avionics
Essential Bus
Serials 1268 and subsequent; The GNC 420 navigator is powered by
28 VDC through the 5-amp GPS2 and 7.5-amp COM 2 circuit breakers
on the Avionics Non-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.
Communication (COM) Transceiver
The GNC 420 includes a digitally-tuned integrated VHF
communications (COM) transceiver. The transceiver and integrated
controls are mounted in the GARMIN GNC 420 unit. The transceiver
receives all narrow- and wide-band VHF communication transmissions
transmitted within a frequency range of 118.000 MHz to 136.975 MHz
in 25.0 kHz steps (720 channels). For European operations, the COM
can be operator configured for 8.33 kHz channel spacing (2280
Revision 02: 08-15-07
P/N 11934-S23 7 of 8
Cirrus Design Section 9
SR20 Supplements
channels). The tuning controls are located at the left side of the GNC
420 front panel. Frequency tuning is accomplished by rotating the
large and small concentric knobs to select a standby frequency and
then transferring the frequency to the active window. The COM
frequency display window is at the upper left corner of the GNC 420
display. Auto-tuning can be accomplished by entering a frequency
from a menu. The COM 2 antenna is located below the cabin on the
airplane centerline. 28 VDC for transceiver operating is controlled
through the Avionics Master Switch and supplied through the 7.5-amp
COM2 circuit breaker on the Avionics Non-Essential Bus.
TERRAIN Interface*
• Note •
*TERRAIN functionality is a standard feature found in GNC
420 units with main software version 5.01 or above and valid
terrain and obstacle databases installed.
　
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本文鏈接地址：西銳20飛機信息手冊 SR22 AIRPLANE INFORMATION MANUAL 1148-126(114)