User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
3. System Description
The T
3
CAS is a safety system that combines TCAS, Terrain Awareness and Warning System
(TAWS), ADS-B IN and OUT and a Mode S Transponder in a single LRU. The following briefly
describes the functions in each T
3
CAS Type Designation. Refer to Table 1-2 for TSO
compliance.
A. T
3
CAS Functionality by Type Designation
(1) T
3
CAS Standard 1, Standard 1.1, Standard 1.2, Standard 1.3, and Standard 2
TCAS II
The TCAS function is an onboard advisory system designed as a last resort
method of preventing midair collisions or near-midair collisions between aircraft.
By computing the closure rate and altitude of all transponder equipped aircraft in
the surrounding airspace, the TCAS can anticipate a potential midair collision
before it has a chance to occur.
TAWS/GPWS
The TAWS function within T
3
CAS features an innovative design aimed at
preventing CFIT (Controlled Flight Into Terrain) accidents by providing timely
aircrew alerts. The alerts are based upon predicted terrain clearance profiles
calculated with present aircraft climb capabilities. This represents a significant
advance in capability from the present Ground Proximity Warning System
(GPWS) technology, and a significant improvement in CFIT safety margins over
existing Terrain Awareness and Warning System (TAWS) designs:
● By providing warnings based on remaining time before pilot response is
required and not based on remaining time to terrain impact
● By covering more operational situations
● By drastically reducing nuisance alerts.
As another optional part of the TAWS system, T
3
CAS incorporates an obstacle
database in addition to the terrain database for additional safety and awareness.
T
3
CAS also integrates an Eleview function as an optional part of the TAWS
system to display main terrain when above the hazard display altitude. Eleview
incorporates a pair of three-digit MSL elevation numbers, additional green
contours and water depiction (on displays supporting cyan). The top three-digit
elevation numbers respresent the highest colored and textured terrain and the
bottom respresent the lowest colored and textured terrain.
Pub. No. 8600200-001, Revision 004
34-45-29
1-23
04 Nov 2014
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