User's Manual Part 1

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
1--35
B. Airplane Personality Module Interface
The Airplane Personality Module (APM) is defined in ARINC Report 607, Attachment 3 --
see Figure 1-- 9. A serial digital interface between the T
2
CAS Computer and the APM
allows the APM to be programmed with aircraft and system configurations during the
initial installation of the T
2
CAS computer. In addition, the serial digital interface allows the
APM to be read during every subsequent power --on to configure the computer for proper
operation. The APM is used to hold/provide information for the T
2
CAS configuration
database, for example, registration number, aircraft type, equipment installed, et cetera.
Moreover, the APM contains the Aircraft Specific Database which defines the
Input/Output definition for the specific aircraft type, the aircraft climb performance data to
support of the TAWS functionality and the windshear algorithm coefficient data.
Figure 1--9. T
2
CAS Airplane Personality Module (APM)
C. Directional Antenna
The T
2
CAS TCAS directional antenna, Figure 1--10, is a four--element, vertically
polarized, monopole array capable of transmitting in four selectable directions at 1030
MHz. The antenna is capable of receiving replies from all directions simultaneously with
bearing information at 1090 MHz, using amplitude--ratio monopulse techniques.
The antenna consists of a molded radome with radiating/receiving elements and is
completely filled with a rigid foam. The antenna assembly uses five or nine screws to
attach the radome and either four or eight screws to attach the antenna to the aircraft
fuselage.