GIA 63 Installation Manual
190-00303-05
Page 2-6
Rev. Y
2.2 Installation Considerations
The GIA 63(X) interfaces with the G1000 system and with various avionics equipment. Fabrication of a
wiring harness is required. Sound mechanical and electrical methods and practices are required for
installation of the GIA 63(X).
2.2.1 Antenna Considerations
Antenna installations on pressurized cabin aircraft require FAA approved installation design and
engineering substantiation data whenever such antenna installations incorporate alteration (penetration) of
the cabin pressure vessel by connector holes and/or mounting arrangements. For needed engineering
support pertaining to the design and approval of such pressurized aircraft antenna installations, it is
recommended that the installer proceed according to any of the following listed alternatives:
1. Obtain approved antenna installation design data from the aircraft manufacturer.
2. Obtain an FAA approved STC, pertaining to, and valid for the antenna installation.
3. Contact the FAA Aircraft Certification Office in the appropriate Region and request identification
of FAA Designated Engineering Representatives (DERs) who are authorized to prepare and
approve the required antenna installation engineering data.
4. Locate an appropriate consultant FAA DER by reviewing the “FAA Consultant DER Directory”,
which can be found at the FAA “Designee and Delegation” web page.
5. Contact an aviation industry organization such as the Aircraft Electronics Association for
assistance.
2.2.2 GPS Antenna Location
The GPS antenna is a key element in the overall system performance and integrity for a GPS/WAAS
navigation system. The mounting location, geometry, and surroundings of the antenna can affect the
system performance and/or availability. The following guidance provides information to aid the installer in
ensuring that the most optimum location is selected for the installation of the GPS antenna. The installation
guidelines presented here meet the intent of AC 20-138A section 16. The greater the variance from these
guidelines, the greater the chance of decreased availability. Approach procedures with vertical guidance
are the most sensitive to these effects. LNAV only approaches, terminal operations, and enroute operations
may also be affected. Because meeting all of these installations guidelines may not be possible on all
aircraft, these guidelines are listed in order of importance to achieve optimum performance. Items 4 below
are of equal importance and their significance may depend on the aircraft installation. The installer should
use their best judgment to balance the installation guidelines.
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