User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
344323
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Page 19
15 Dec 2005
GROUND
STATION
AD53001@
TCAS
CU
MODE S
XPDR
MODE S
XPDR
TCAS
CU
Figure 12. TCAS/Mode S Communication
The TCAS 3000 generates both RAs and TAs when the TA/RA mode is selected. The
two types of advisories correspond to timebased protection zones around the aircraft.
The airspace around the TCAS aircraft where an RA is annunciated represents the
warning area, while the larger airspace which results in a TA being annunciated is the
caution area. Figure 13 contrasts the airspace covered by the two types of advisories.
The onboard equipment listed below must be linked to the TCAS 3000 as shown in
Figure 14.
Mode S transponder with associated antennas
Radio altimeter
Air Data Computer (ADC) (digital or analog). If an ADC does not support vertical
speed rate data, an optional PTM must be used if the display is a ACSS VSI/TRA.
ATC/TCAS control panel. A separate control panel is not the only method of control
for the TCAS. Other components, such as a Honeywell Radio Management Unit
(RMU) as part of a Primus II Integrated Radio System, can be used.
Omnidirectional antenna. The TCAS 3000 accepts two types of bottom antennas: A
standard directional antenna or an optional ATCtype omnidirectional antenna. If an
omnidirectional antenna is installed, it must be supplied by the installer. If a directional
antenna is installed at both top and bottom antenna locations, a bottom
omnidirectional antenna is not needed.