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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
　
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