Garmin GNS 480 Installation Manual Download

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Limitations

GNS 480 (CNX80) Installation Manual560-0982-01 Rev A

5-1

5 L

IMITATIONS

5.1 O

PERATION

There are no Part 23 aircraft type limitations. All functions of the GNS 480 meets the appropriate design
assurance qualifications for primary or secondary for airplane Class I, Class II, Class III, and Class IV in
accordance with AC 23.1309-1C Figure 2. The TSO authorizations with the RTCA/DO178B software
levels by function are listed in Table 1-1.

TSO-C146a defines loss of function of en route, terminal, nonprecision approach, or precision approach
navigation data as a major failure condition. AC 23.1309-1C provides guidance for IFR airplanes that
classifies total loss of function as a major failure condition, and loss of primary means of function as
minor if two navigation systems are installed. One method to meet the major failure condition for loss of
function is to install redundant systems. It is recommended that the aircraft be equipped with at least two
independent navigation receivers and two independent communication transceivers for IFR use. For

independent navigation systems, two GNS 480 units may be used, or a combination of GNS 480 and an
independent Nav/Com unit may be used

This will support a System Safety Assessment of minor for IFR

operations. Refer to AC 23.1309-1C.

The installation of a GNS 480 into an aircraft does not alter the operational approvals previously granted
to that aircraft. Additional operation approvals may require FAA evaluation of all the systems installed
in a particular aircraft and is outside the scope of the GNS 480 STC.

5.2 I

NSTALLATION

The conditions and test required for TSO approval of this article are minimum performance standards. It
is the responsibility of those installing this article either on or within a specific type or class of aircraft to
determine that the aircraft installation conditions are within the TSO standards. TSO articles must have
separate approval for installation in an aircraft. The article may be installed only if performed under 14
CFR part 43 or the applicable airworthiness requirements.

The GNS 480 WAAS/GPS receiver and antenna are compatible with aircraft equipped with SATCOM.

5.2.1 GPS

NTENNA

The WAAS/GPS receiver is only compatible with the Garmin AT A-33 (590-1104) or A-34 (590-1112)
antennas, or those with equivalent specifications. Refer to section 1.3.10.1 for specifications.

5.2.2 A

NTENNA

NSTALLATION

–

ENERAL

Antenna installation in the pressure vessel of pressurized aircraft is beyond the scope of the GNS 480
STC. Additional manufacturer's data may be necessary and FAA approval may be required to cover the
installation of any antenna in the pressure vessel of a pressurized aircraft.

5.2.3 E

QUIPMENT

NTERFACED TO THE

GNS

480

GNS 480 interfaces to aircraft systems other than those shown in this installation manual are outside the
scope of this manual and may require further evaluation and/or certification approval.

All equipment interfaced to the GNS 480 must be previously or concurrently approved.