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Supplement
for
Garmin GNS 430 GPS Navigator
When a Garmin GNS 430 GPS Navigator with NAV, ILS, and COM is
installed in the Cirrus Design SR20, this Supplement is applicable and
must be inserted in the Supplements Section (Section 9) of the Cirrus
Design SR20 Pilot's Operating Handbook. This document must be
carried in the airplane at all times. Information in this supplement
either adds to, supersedes, or deletes information in the basic SR20
Pilot's Operating Handbook.
• Note •
This POH Supplement Revision dated May 25, 2005
supersedes and replaces Revision 1 of this supplement dated
January 31, 2000.
Revised: May 25, 2005
2 of 10 11934-S03
Section 05-25-05 Cirrus Design
11934-S03 R2 SR20
Figure - 1
Section 1 - General
The airplane is equipped with a Garmin GNS 430 GPS Navigator with
VHF Nav, ILS, and VHF COM herein referred to as the “Navigator.”
The GNS 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 GARMIN GNS 430 GPS Navigator may be installed in single or
dual installations. If one GNS 430 is installed, it will be designated
‘GPS 1,’ and either a GARMIN GNC 250XLGPS Navigator or a
GARMIN GNC 420 GPS Navigator will be installed as GPS 2. Refer to
applicable supplements for descriptions of these units.
If two GARMIN GNS 430 Navigators are installed, the upper unit will
be designated ‘GPS 1’ and the lower unit will be designated ‘GPS 2.’ In
these installations, the ARNAV ICDS 2000 and the HSI will display
GPS 1 information and the CDI (VOR/LOC/ILS/GS Indicator) will
display GPS 2 information.
• Note •
Refer to GPS 430 INTEGRATION in the NORMAL
PROCEDURES Section of this supplement for a more
detailed description of GPS 430 integration in the various
configurations.
SR20_FM09_1109
Garmin GNS 430 Front Panel
Revised: May 25, 2005
11934-S03 3 of 10
Cirrus Design Section 9
SR20 Supplements
Section 2 – Limitations
Provided the GPS Navigator is receiving adequate usable signals, it
has been demonstrated capable of and has been shown to meet the
accuracy specifications of:
1. VFR/IFR, enroute, terminal, and instrument approach (GPS, VOR)
operations, that is, enroute, terminal, and instrument approach
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.
2. The Garmin GNS 430 Pilot's Guide and Reference, P/N 190-
00140-00, Revision A dated December 1998 (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.
3. The Navigator must utilize software version 2.XX (where X is a
digit, 0-9).
4. 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.
5. 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.
Revised: May 25, 2005
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Section 05-25-05 Cirrus Design
11934-S03 R2 SR20
6. The aircraft must have other approved navigation equipment
installed and operating appropriate to the route of flight.
7. The Garmin GNS 430 meets RNP5 (BRNAV) requirements of
AC 90-96 and is in accordance with AC 20-138, and JAA AMJ
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