Honeywell CAS-100 Maintenance Manual page 47

Table 1. TCAS System Components (Honeywell Supplied) (cont)
Equipment Type
TRA-67 Transponder Subsystem (cont)
TRA-67A Mode S (cont)
Mode S Transponder
/TCAS Control Units
CTA-81A
CTA-81B
CTA-100A
NOTE 6.
Two Transponder
Omnidirectional Antennas
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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
Honeywell
Part Number
066-01127
071-01477
071-01503
071-01480
071-01492
1042000-101 through
-499 for Keypad entry
models.
1042000-501 through
-999 for Rotary
Control entry models.
Description
The Mode S transponder receives 115 V 400 Hz from
an aircraft power source. If a synchro altitude source
input is used, the transponder receives 26 V ac
synchro reference power from an aircraft power
source.
The transponder is connected to the aircraft
suppression bus.
The Mode S Transponder/TCAS Control Units are
panel-mounted ARINC 718/735A assemblies. The
units contain a front mounted transponder/ TCAS
mode control, altitude reporting on/off control,
transponder ATC identification code select controls,
and a special identifier pushbutton. The unit also
contains a transponder failure indicator and ATC
IDENT code display.
The Mode S transponder/TCAS control unit moves the
control data and failure status data to the Mode S
transponder. The control unit FAIL annunciator
receives the failure status from the Mode S
transponder through a discrete monitor signal line.
The Mode S transponder/TCAS control unit receives
115 V 400 Hz and lighting power from the aircraft
power sources. A separate fault lamp source is
necessary and cannot be turned fully off (day/night).
The CTA-100A is designed to be a drop-in functional
replacement for the Honeywell CTA-81A, 81B, 81C,
and 81D controllers. The controller provides data from
the front panel to the system using ARINC 429
databuses and discrete interface signals.
The antennas are attached directly to the top and
bottom of the aircraft. The units have an L-band blade
type dipole antenna. The antennas are connected to
the Mode S transponder through rf cables. Omni
antennas must be approved to a minimum one of
these TSO specifications: C66b, C74, C112, C119
34-45-47
Page 13
1 Dec 2003