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within the U.S. National Airspace System, North Atlantic Minimum
Navigation Performance Specification (MNPS) Airspace using the
WGS-84 (or NAD 83) coordinate reference datum in accordance
with the criteria of AC 20-138, AC 91-49, and AC 120-33.
Navigation data is based upon use of only the global positioning
system (GPS) operated by the United States.
SR20_FM09_1109
GARMIN GNC 420 Front Panel
Revision 02: 08-15-07
P/N 11934-S23 3 of 8
Cirrus Design Section 9
SR20 Supplements
Section 2 - Limitations
1. The GARMIN GNC 420 Pilot's Guide and Reference, P/N 190-
00140-20, Revision B dated August 2002 (or later appropriate
revision) must be immediately available to the flight crew
whenever navigation is predicated on the use of the GPS
Navigator. The software status stated in the pilot's guide must
match that displayed on the equipment.
2. The Navigator must utilize software version 2.XX (where X is a
digit, 0-9) or later.
3. IFR enroute and terminal navigation is prohibited unless the pilot
verifies the currency of the database or verifies each selected
waypoint for accuracy by reference to current approved data.
4. GPS instrument approaches must be accomplished in accordance
with approved instrument approach procedures that are retrieved
from the Navigator’s NavData database. The database must
incorporate the current update cycle.
a. Instrument approaches must be conducted in the approach
mode and RAIM must be available at the Final Approach Fix.
b. Accomplishment of ILS, LOC, LOC-BC, LDA, SDF, and MLS
approaches are not authorized in GPS mode.
c. When an alternate airport is required by the applicable
operating rules, it must be served by an approach based on
other than GPS navigation, the aircraft must have operational
equipment capable of using that navigation aid, and the
required navigation aid must be operational.
5. The aircraft must have other approved navigation equipment
installed and operating appropriate to the route or flight.
6. The Garmin GNC 420 meets RNP5 (BRNAV) requirements of
AC 90-96 and is in accordance with AC 20-138, and JAA AMJ
20X2 Leaflet 2 Revision 01, provided it is receiving usable
navigation information from the GPS receiver.
7. Do not use the TERRAIN Interface for navigation of the aircraft.
The Terrain Display does not provide TAWS capability and is
intended to serve as a situational awareness tool only and does
not provide the accuracy fidelity on which to solely base terrain or
obstacle avoidance maneuvering decisions.
Revision 02: 08-15-07
4 of 8 P/N 11934-S23
Section 9 Cirrus Design
Supplements SR20
Section 3 - Emergency Procedures
1. If GPS Navigator information is not available or is invalid, utilize
remaining operational navigation equipment as required.
2. If "RAIM NOT AVAILABLE…" or “RAIM POSITION WARNING”
message is displayed, continue to navigate using the GPS
equipment or revert to an alternate means of navigation
appropriate to the route and phase of flight. When continuing to
use GPS navigation, position must be verified every 15 minutes
using another IFR approved navigation system.
Section 4 - Normal Procedures
Normal operating procedures are outlined in the GARMIN GNC 420
Pilot's Guide and Reference, P/N 190-00140-20, Revision B dated
August 2002 (or later appropriate revision).
Activate GPS
1. Battery Master Switch ............................................................... ON
2. Avionics Power Switch .............................................................. ON
3. Navigator Com/ Power Switch...................................... Rotate ‘ON’
The Navigator will display a welcome page while the self-test is in
progress. When the self test is successfully completed, the
Navigator asks for NavData database confirmation, acquires
position, and then displays the acquired position on the
Navigator’s display.
• Note •
The Navigator is not coupled to an air and fuel data computer.
Manual fuel-on-board and fuel flow entries must be made in
order to use the fuel planning function of the AUX pages.
The GPS Navigator utilizes altitude information from the
altitude encoder’s altitude digitizer to enhance altitude
information.
Revision 02: 08-15-07
P/N 11934-S23 5 of 8
Cirrus Design Section 9
SR20 Supplements
GPS Course Remote Display
GNC 420 GPS course information is displayed on the airplane CDI.
• Note •
Since the GNC 420 does not provide ILS outputs, the CDI
utilized in this installation does not provide glideslope display.
　
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