Instruction Manual

G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 2-11
190-00716-01 Revision 4
2.1.17 GTS 820/850 Traffic System (optional)
The GTS 820/850 is a traffic surveillance system that uses active interrogation of Mode S and Mode C
transponders to provide traffic advisories to the pilot. The GTS 820 is a TAS unit; the GTS 850 is a
TCAS I unit. The installation includes a top directional antenna (GA 58) paired with a GPA 65 power
amplifier / low noise amplifier (PA/LNA) unit and a bottom, unamplified GA 58 antenna. The GTS
820/850 is located in the nose avionics bay on the top, left shelf. The GPA 65 is located in the left
sidewall area, just in front of the most forward cabin window. The GTS 820/850 traffic system is
powered from Right Gen Avionics Bus.
Figure 2-16, GTS 820/850 Traffic System
2.1.18 GTS Traffic Processor
The GTS Traffic Processor is a microprocessor-based Line Replaceable Unit that uses active
interrogations of Mode S and Mode A/C transponders to provide Traffic Advisories and Resolution
Advisories (GTS 8000 only) to the pilot. When installed, the GTS Processor can be configured as TAS
(GTS 825), TCAS I (GTS 855), or TCAS II (GTS 8000). The GTS traffic processor is installed in the
nose avionics bay. The GTS interfaces to the GA58 traffic antennas which are mounted on the upper and
lower fuselage. The GTS traffic processor also interfaces with the GTX 3000 through ARINC 429 digital
data lines. The GTS traffic processor is powered from the Right Gen Avionics Bus.
Figure 2-17, GTS Traffic Processor