Garmin GNC 250XL Manuale utente

P/N 11934-S05 1 of 6

Cirrus Design Section 9

SR20 Supplements

Pilot’s Operating Handbook and

FAA Approved Airplane Flight Manual

Supplement

for

Garmin GNC 250XL GPS Navigator

w/ VHF COM

When a Garmin GNC 250XL GPS Navigator with VHF 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.

Original: 3-31-99

2 of 6 P/N 11934-S05

Section 9 Cirrus Design

Supplements SR20

Figure - 1

Section 1 - General

The airplane is equipped with a Garmin GNC 250XL GPS Navigator

with VHF COM, herein referred to as the “Navigator.” The GNC 250XL

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 VHF COM

transceiver facilitates communication with Air Traffic Control.

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 AC 20-138 for VFR flight. Navigation is

accomplished using the WGS-84 (NAD-83) coordinate reference

datum. Navigation data is based upon use of only the Global

Positioning System (GPS) operated by the United States of America.

SR20_FM09_1110

Garmin GNC 250XL Front Panel

Original: 3-31-99

P/N 11934-S05 3 of 6

Cirrus Design Section 9

SR20 Supplements

Section 2 - Limitations

1. The Garmin GNC 250XL Pilot's Guide and Reference, P/N 190-

00067-60, Revision A dated March 1997 (or later appropriate

revision) must be immediately available to the flight crew

whenever navigation is predicated on the use of the GPS

Navigator.

2. The Navigator must utilize software version 2.X (where X is a digit,

0-9).

3. The GNC 250XL is limited to VFR navigation only.

Section 3 - Emergency Procedures

1. If GPS Navigator information is not available or is invalid, utilize

remaining operational navigation equipment as required.

2. If the “RAIM POSITION WARNING” message is displayed,

immediately revert to an alternate means of navigation

appropriate to the route and phase of flight.

3. If the “RAIM NOT AVAILABLE…” 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.

4. In an in-flight emergency, depressing and holding the COM

transfer button for two (2) seconds selects the emergency

frequency, 121.500 MHz, into the active frequency window.

Original: 3-31-99

4 of 6 P/N 11934-S05

Section 9 Cirrus Design

Supplements SR20

Section 4 - Normal Procedures

Normal operating procedures are outlined in the Garmin GNC 250XL

Pilot's Guide and Reference, P/N 190-00067-60, Revision A dated

March 1997 (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, displays the

satellite status page while it acquires position, and then displays

the acquired position on the Navigator’s display.

Deactivate GPS

1. Navigator COM/ Power Switch.......................... Rotate CCW ‘OFF’

Section 5 - Performance

No Change

Section 6 - Weight & Balance

No Change

Section 7 - Systems Description

• Note •

This supplement provides a general description of the Garmin

GNC 250XL, its operation, and SR20 interface. For a detailed

description of the GNC 250XL and full operation instructions

refer to the Garmin GNC 250XL Pilot's Guide and Reference,

P/N 190-00067-60, Revision A dated March 1997 (or later

appropriate revision).

Original: 3-31-99

P/N 11934-S05 5 of 6

Cirrus Design Section 9

SR20 Supplements

GNC 250XL Integrated GPS/NAV/COM System

This airplane is equipped with a GNC 250XL integrated GPS navigator

and COM receiver. The GPS navigator consists of a GPS receiver and

a Jeppesen NavData database all contained in the GNC 250XL

control unit mounted in the center console. The GPS is designated

‘GPS 2.’ Also integrated into the GNC 250XL control unit is a VHF

communications receiver, designated COM 2. All tuning and display

controls for the GPS and COM are located in the GNC 250XL 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 250XL

Pilot’s Guide and Reference.

GPS Navigator

The Garmin GNC 250XL GPS navigator provides backup for the GNS

430 Navigator and is approved for VFR use only. 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 antenna is

located on the underside of the glareshield behind the MFD. All GPS

navigator controls and functions are accessible through the GNC

250XL front control panel located in the center console. The panel

includes function keys, power switches, MSG and Nav status

annunciators, LCD display, two concentric selector knobs, and a

Jeppesen NavData card slot in each panel. The GNC 250XL navigator

is powered by 28 VDC through the 7.5-amp COM2 circuit breaker 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.

Original: 3-31-99

6 of 6 P/N 11934-S05

Section 9 Cirrus Design

Supplements SR20

Communication (COM) Transceiver

The GNC 250XL includes a digitally-tuned integrated VHF

communications (COM) transceiver. The transceiver and integrated

controls are mounted in the Garmin GNC 250XL unit and are

designated COM2. 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). The tuning controls are collocated with the NAV at the

right side of the GNC 250XL 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 active frequency is always displayed at the upper

left corner of the GNC 250XL display. The standby frequency is

displayed below the active frequency in the map mode and to the right

of the active frequency in all other modes. 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.

Original: 3-31-99

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