Cabling And Wiring; Air Circulation And; Viewing Angle - Garmin GNS 480 Installation Manaul

Installation Procedures
2.5.4

Cabling and Wiring

Wiring should be installed in accordance with AC 43.13-1B Chapter 11. For dual GNS 480 installations,
care should be taken to ensure separation between wires of redundant systems to reduce the possibility of
loss of navigation due to a single event. When wire separation cannot be achieved, the following issues
should be addressed:
•
It should not be possible for a cable harness to be exposed to wire chafing in a manner that both
GPS units fail simultaneously;
•
The cable harness should not be located near flight control cables and controls, high electrical
capacity lines or fuel lines;
•
The cable harness should be located in a protected area of the aircraft (e.g., isolated from engine
rotor burst); and
•
Do not route cable near high-energy sources
Refer to the Electrical Connections in Appendix D for the appropriate wiring connections to assemble the
wiring connector. Once the cable assemblies have been made, attach the cable connectors to the rear
connector plate. After installing the mounting tube, attach the assembled connector. Route the wiring
bundle as appropriate. Use 22 to 24 AWG wire for all connections except for power. Use 20 AWG for
power/ground. Avoid sharp bends.
2.5.5 Air Circulation and Cooling
The GNS 480 has internal fans for cooling. No external cooling is required. No special provisions are
required during installation to accommodate the fans except to ensure the fan openings are not blocked.
2.5.6 Compass Safe Distance
After reconfiguring the avionics in the cockpit panel, if the GNS 480 is mounted less than seven inches
from the compass, recalibrate the compass and make the necessary changes for noting correction data.
2.5.7

Viewing Angle

The GNS 480 shall be located such that the operator will have easy access to the controls and have
adequate view of the display. The GNS 480 may be adequately viewed from the primary pilot's position
when the following minimums are met:
Up: 60 degrees off pilot's eye center line
Down: 35 degrees off pilot's eye center line
Right: 60 degrees off pilot's eye center line
Left: 60 degrees off pilot's eye center line
2.5.8 Helicopter Installation
The GNS 480 is qualified for helicopter installation – no special mounting hardware is typically required,
if installing in the OEM provided mounting location.
Helicopter installation data is provided in the 560-0999-xx GNS 480 Helicopter Installation Supplement.
Helicopter installations not covered by STC SR01864LA (see "STC data" in the product CD) may be
individually field approved using the data in the GNS 480 Helicopter Installation Supplement, and other
applicable documentation.
2-8 560-0982-01 Rev L GNS 480 (CNX80) Installation Manual