Section 7 - Systems Description - Garmin 400W-Series Operating Handbook

Section 9
Supplements

Section 7 - Systems Description

This section provides general description and aircraft
integration information for the Garmin GNC 420W and GNS
430W 400W-Series Navigators. For detailed descriptions and
operational instructions, refer to the Garmin 400W-Series
GPS Navigator Pilot's Guide and Reference, P/N 190-00356-
00, Revision A or later revision
GNC 420W
The GNC 420W, designated as the secondary navigator (GPS 2), is a
GPS Navigator and VHF communications transceiver. The GPS
Navigator consists of a GPS receiver, a navigation computer, and a
Jeppeson NavData database all contained in the GNC 420W control
unit mounted
communications receiver, designated COM 2, is also integrated into
the unit.
GPS Navigator
The GNC 420W navigator is coupled to the airplane's CDI. The GPS 2
antenna is located on top of the fuselage slightly aft of the rear window
along the airplane centerline. The 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.
Communication (COM) Transceiver
The GNC 420W
communications (COM) transceiver. 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 COM 2 circuit
breaker on the Avionics Non-Essential Bus.
6 of 10
• Note •
in the center
includes
console.
a digitally-tuned
Cirrus Design
Additionally,
integrated
P/N 11934-S38
Revision 02: 10-29-13
SR20
a VHF
VHF