Honeywell CAS-100 Maintenance Manual page 44

Table 1. TCAS System Components (Honeywell Supplied) (cont)
Equipment Type
Dedicated TCAS Traffic Display
ITA-81A 066-50003
TRA-67 Transponder Subsystem
TRA-67A Mode S 066-01127
Transponder
NOTE 5.
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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
Honeywell
Part Number
The ITA-81A is a front-panel attached cathode ray tube
(CRT) TCAS display unit. The display receives the traffic
and TCAS mode data on a high-speed ARINC 429 bus
from the TPA-100A TCAS processor. The unit displays
an aircraft symbol and range rings with TCAS traffic and
mode.
The ITA-81A receives 115 V 400 Hz primary power and 5
V ac panel lighting power from the aircraft power sources.
The TRA-67A transponder is a tray attached ARINC
718A assembly. The transponder contains a
microprocessor based Mode S/ATCRBS transponder
control and processing unit. The unit also contains an
L-band rf transmitter/receiver, and various synchro
discrete and digital interface networks.
A Mode S transponder transmits 1090-MHz Mode S or
ATCRBS reply messages when it receives appropriate
1030-MHz Mode S or ATCRBS interrogations from other
TCAS equipped aircraft or air traffic control ground
stations. Mode S interrogations contain a unique aircraft
address identification. Only the Mode S transponder
assigned to that address will reply. ATCRBS
interrogations do not contain a transponder address. If
the transponder is connected to equipment that
measures pressure altitude, the Mode S or ATCRBS
Mode C reply will contain the pressure altitude.
Description
34-45-47
Page 10
1 Dec 2003