User's Manual

GTS Processor Installation Manual Page 2-3
190-00587-50 Revision A
2.2 Installation Considerations
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
required for installation of the GTS Processor.
2.2.1 Antenna Considerations
Refer to GA 58 Installation Manual 190-00587-20 for antenna installation information.
For GTS 855/GTS 825 installations, either a monopole antenna or directional
antenna may be used if installing an optional bottom mounted antenna. For GTS
8000 installations, a bottom monopole or directional antenna is required. A
bottom directional antenna installation (recommended) gives the benefit of
intruder bearing visibility for targets that are shaded from the top directional
antenna. The target bearing accuracy may be degraded for bottom directional
antenna installations on aircraft with fixed gear.
2.2.1.1 TAS/TCAS Antenna Location
Refer to GA 58 Installation Manual 190-00587-20 for antenna installation information
2.3 Electrical Bonding
Electrical equipment, supporting brackets, and racks should be electrically bonded to the aircraft’s main
structure. Refer to SAE ARP 1870 section 5 when surface preparation is required to achieve electrical
bond. The electrical bond should achieve direct current (DC) resistance less than or equal to 2.5 milliohms
to local structure to where the equipment is mounted. Compliance should be verified by inspection using a
calibrated milliohm meter. An equivalent OEM procedure may also be substituted. There may be OEM-
specific reasons for electrically isolating equipment or having a higher bond resistance. These reasons
should be rationalized upon installation approval. In general, Garmin recommends that all GTS Processor
equipment be electrically bonded.
Refer to GA 58 Installation Manual 190-00587-20 for antenna installation information.
For composite aircraft, the antenna baseplate must be electrically bonded to the common ground of other
installed equipment for lightning purposes. This can be achieved through the antenna mounting screws.
NOTE
DRAFT