Cirrus Design
SR20
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 F dated July 2000 (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) or later.
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.
P/N 11934-S22
Revision 2: 08-15-07
Section 9
Supplements
3 of 10
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