GTS 8XX/GPA 65 Installation Manual
Page 1-1
190-00587-00
Revision 4TP
1 GENERAL
DESCRIPTION
1.1 Introduction
This manual presents mechanical and electrical installation requirements for installing the
GTS 8XX/GPA 65 Traffic Advisory System (TAS) and Traffic Collision Avoidance System (TCAS I).
1.2 Equipment
Description
The GTS 8XX is a microprocessor-based Line Replaceable Unit (LRU) that uses active interrogations of
Mode S (GTS 820 and GTS 850 only) and Mode C transponders to provide Traffic Advisories to the
pilot. The GTS 820 and GTS 850 include a GPA 65 power amplifier/low-noise amplifier (PA/LNA)
module, which allows for up to 40 nm of active surveillance range as well as Mode S interrogation
capability. When installed with a 1090 MHz ADS-B transmit class of equipment the GTS 8XX also
utilizes passive surveillance. Traffic is displayed on an external MFD via ARINC 429 and/or Ethernet
High Speed Data Bus (HSDB). An aural alert is also provided to inform the crew a traffic advisory (TA)
will be displayed.
A top-mounted directional antenna is used to derive bearing of the intruder aircraft, which is displayed
with relative altitude to own aircraft. Top antenna transmitted interrogations are directional, reducing the
number of transponders that receive the interrogation thus reducing potential garble on the 1090 MHz
band. Optional bottom antenna transmit interrogations are omni directional, using a monopole antenna
(recommended for fixed gear installations) or a directional antenna (recommended for retractable gear
installations). A bottom directional antenna installation gives the benefit of intruder bearing visibility for
targets that are shaded from the top directional antenna.
1.2.1 GTS 8XX Model Differences
The following table summarizes the differences between the various GTS 8XX models documented in
this manual.
Traffic Ad
vis
o
ry System
(TAS
)
Traffic Collision
Avoida
nce S
yste
m
(TCAS I
)
1090 ES ADS-B
Rec
e
iver
GPA 65
PA/LNA
Transm
it Power
(W
at
ts)
GTS 800
011-01356-00
X X 40
GTS 820
011-01446-00
X X X
200
GTS 850
011-01553-00
X X X
200
1.3 Interface
Summary
The GTS 8XX is designed as an open architecture system that uses typical ARINC 429, RS-232, and
Ethernet communications interfaces.