Cirrus Design SR22

Section 9 Supplements

Pilots Operating Handbook and FAA Approved Airplane Flight Manual Supplement For
Garmin GNC 420 GPS Navigator
When a GARMIN GNC 420 GPS Navigator with VHF COM is installed in the Cirrus Design SR22, this Supplement is applicable and must be inserted in the Supplements Section (Section 9) of the Cirrus Design SR22 Pilots 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 SR22 Pilots Operating Handbook. Note This POH Supplement Revision dated Revision 2: 08-15-07 supersedes and replaces the Revision 1 of this supplement dated 05-25-05.
P/N 13772-104 Revision 2: 08-15-07

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Section 1 - General
The airplane is equipped with a GARMIN GNC 420 GPS Navigator with VHF Com herein referred to as the Navigator. The GNC 420 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 airplanes position (latitude, longitude, and altitude) and the altitude digitizer to enhance the altitude calculation. 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: VFR/IFR, enroute, terminal, and instrument approach (GPS) 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.

SR22_FM09_1285

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Figure - 1 GARMIN GNC 420 Front Panel

Section 2 - Limitations

1. The GARMIN GNC 420 Pilot's Guide and Reference, P/N 19000140-20, 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 Navigators 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. c. Accomplishment of ILS, LOC, LOC-BC, LDA, SDF, and MLS approaches are not authorized in GPS mode. 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 GNS 420 meets RNP5 (BRNAV) requirements of AC 90-96 and is in accordance with AC 20-138, and JAA AMJ 20X2 Leaflet 2 Revision 1, 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.
P/N 13772-104 Revision 2: 08-15-of 8
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 Navigators 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 encoders altitude digitizer to enhance altitude information.

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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.

Deactivate GPS

1. Navigator Com/ Power Switch. Rotate CCW OFF

Section 5 - Performance

No change from basic Handbook.
Section 6 - Weight & Balance
Section 7 - Systems Description
Note This supplement provides a general description of the GARMIN GNC 420, its operation, and SR22 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 Pilots Guide and Reference.

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GPS Navigator
The GARMIN GNC 420 GPS navigator is the secondary system (GPS 2), is IFR certified, and is coupled to the airplanes 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 airplanes 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. 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 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

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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 GNS 430 units with main software version 5.01 or above and valid terrain and obstacle databases installed. Garmin TERRAIN is a terrain awareness system incorporated into GNS 430 units to increase situational awareness and aid in reducing controlled flight into terrain. The TERRAIN function displays altitudes of terrain and obstructions relative to the aircrafts altitude and are advisory in nature only. Individual obstructions may be shown if available in the database, however, not all obstructions may be available in the database and data may be inaccurate. TERRAIN information should be used as an aid to visual acquisition and not use to navigate or maneuver to avoid terrain. For for a more detailed description of the TERRAIN function, refer to the Garmin GNS 430 Pilot's Guide and Reference, P/N 190-00140-00, Revision H dated May 2006 or later revision.

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