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Table 17. ITA-81A Traffic Display Inputs and Outputs
Source Or
Destination
TCAS PROCESSOR RELATED I/O
TCAS Processor
POWER RELATED I/O
Own Aircraft Power
Supplies
Own Aircraft Dimmer
Bus
C. TCAS Failure Monitoring
The TCAS system includes extensive Built-In-Test Equipment (BITE) monitoring. BITE does
full-time monitoring of the TCAS system components. Primary failures are shown on the
screen of the PPI or dedicated traffic display, and on different FAIL lamps and flags throughout
the system. BITE monitoring is totally transparent to the pilot and does not effect the TCAS
operation unless a failure is found. When a primary system failure is found, specified LRU
(line replaceable unit) failures are shown on the PPI or dedicated traffic display. If a PPI
weather/traffic display is used in a weather mode, TCAS FAIL will be annunciated. When the
display is set to TCAS mode, the specified LRU failure(s) is shown.
BITE monitors the internal operation of the system components and I/O data links.
When a TCAS FAIL condition is found, TCAS stops all surveillance and tracking functions.
NOTE: A complete description of BITE monitoring operations and their failure annunciations
and indicators, is contained in the TESTING AND FAULT ISOLATION and in the
MAINTENANCE PRACTICES sections of this manual.
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
I/O Signal
Name and Type
TCAS Data High-Speed ARINC
429
Display Status No. 3 Discrete
Traffic Alert Display Enable
Discrete
115 V 400 Hz
5 V ac
General
Description
Traffic display data from TCAS
processor to dedicated TCAS traffic
display.
Supplies dedicated display failure
status to TCAS processor.
TCAS processor discrete output sets
the power supply of dedicated display.
Supplies the primary power to
dedicated TCAS traffic display.
Controls panel background lighting on
dedicated display.
34-45-47
Page 81
1 Dec 2003
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