Specifications

P/N 11934-S23 5 of 8
Cirrus Design Section 9
SR20 Supplements
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
No change from basic Handbook.
Section 7 - Systems Description
• Note •
This supplement provides a general description of the
GARMIN GNC 420, its operation, and SR20 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 Pilot’s Guide and Reference.
Revision 02: 08-15-07