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MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
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4. System Description
A. General
The Honeywell TCAS system includes the following equipment:
• TPA-100A TCAS Processor
• ANT-81A Directional Antenna
• IVA-81A/D Traffic Advisory/Vertical Speed Indicator (TA/VSI)
• IVA-81B Resolution Advisory/Vertical Speed Indicator (RA/VSI)
• Omnidirectional Antenna
• Mode S Transponder System which includes a Mode S transponder,
transponder/TCAS control unit, and two omnidirectional antennas
• Optional PPI or dedicated TCAS traffic display unit, required aircraft equipment, and
optional aircraft equipment.
NOTE:
The TPA-100A TCAS Processor is examined in this manual. Other TCAS
equipment
is examined to a level necessary for understanding total TCAS operation. Mode S
Transponder System components are included in separate manuals recorded in Table
Intro-1.
B. CAS-100 Functional Overview
The basic CAS-100 system does traffic alert and collision avoidance functions to give safe
separation between own aircraft and other aircraft equipped with Mode S transponders,
ATCRBS Mode C transponders, or ATCRBS Mode A/C transponders.
NOTE:
Mode A/C transponders are Mode A transponders that respond to Mode C
interrogations. CAS-100 operation can be separated into the these primary functions:
(1) Surveillance Function
• Detects the presence of Mode S or ATCRBS Mode A/C transponder equipped aircraft
that are in TCAS surveillance limits.
• Determines initial range, relative bearing (if detection occurs on a directional antenna),
and relative altitude (if aircraft is reporting altitude).
• Calculates closing range rate.
• Determines if the aircraft should be put in track.