General Description; Introduction; Equipment Description - Garmin GNC 420A Installation Manual

1.

GENERAL DESCRIPTION

1.1

INTRODUCTION

This manual describes the physical, mechanical, and electrical characteristics and the installation
requirements for the 400 Series (GPS 400, GNC 420, and GNS 430) Panel-mounted units. After
installation of the 400 Series system, FAA Form 337 must be completed by an appropriately certificated
agency to return the aircraft to service.
1.2

EQUIPMENT DESCRIPTION

The 400 Series units are mark width (6.25" wide) units, and 2.66" high. The display is a 128 by 240 pixel
color LCD. The units include two removable data cards, one with a Jeppesen database, and the second
being reserved for future expansion.
The GPS 400 is a GPS receiver certifiable for IFR en route, terminal, and non-precision approach
operations.
The GNC 420/ (A) includes all the features of the GPS 400, and also includes an IFR certified airborne
VHF communications transceiver. The (A) model is a 28 Vdc unit with a 16 Watt COM transmitter.
The GNS 430/ (A) includes all the features of the GNC 420, and also includes IFR certified airborne
VOR/Localizer and Glideslope receivers. The (A) model is a 28 Vdc unit with a 16 Watt COM transmitter.
GPS signals are received by Garmin's low profile GA 56 antenna (P/N 010-10040-0X).
The GPS 400 Series product lens is coated with a special anti-reflective coating which is
very sensitive to skin oils, waxes and abrasive cleaners. CLEANERS CONTAINING
AMMONIA WILL HARM THE ANTI-REFLECTIVE COATING. It is very important
to clean the lens using a clean, lint-free cloth and an eyeglass lens cleaner that is
specified as safe for anti-reflective coatings.
The use of ground-based cellular telephones while aircraft are airborne is prohibited by
FCC rules. Due to potential interference with onboard systems, the use of ground-based
cell phones while the aircraft is on the ground is subject to FAA regulation 14 CFR
§91.21.
FCC regulation 41 CFR §22.925 prohibits airborne operation of ground-based cellular
telephones installed in or carried aboard aircraft. Ground-based cellular telephones must
not be operated while aircraft are off the ground. When any aircraft leaves the ground, all
ground-based cellular telephones on board that aircraft must be turned off.
Ground-based cell phones that are on, even in a monitoring state, can disrupt GPS
performance.
400 SERIES INSTALLATION MANUAL
P/N 190-00140-02
CAUTION
CAUTION
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