User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

CAS/Part No.9005000

The TCAS function generates both RAs and TAs when the TA/RA mode is

selected. The two types of advisories correspond to time-based 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 1-3 contrasts the airspace

covered by the two types of advisories.

The onboard equipment listed below must be linked to the TCAS function as

shown in Figure 1-4.

● 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, the static line can be run directly into the Thales

VSI-TCAS.

● ATC/TCAS control panel. A separate control panel is not the only method of

control for the TCAS. Other components, such as a Radio Management Unit

(RMU) can be used.

● Antenna. The TCAS function accepts two types of bottom antennas: A

standard directional antenna or an optional ATC-type 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.

NOTE:

CAS LRU Part Numbers 9005000-10000, -10101, -10202, and -

10204 do not support a bottom omnidirectional antenna.

1-30

04 Nov 2014

34-45-29

Pub. No. 8600200-001, Revision 004

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