User's Manual Part 1

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
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Call-- outs and excessive bank angle
As defined in RTCA DO-- 161A, T
2
CAS produces call -- outs and alerts for
descent below a set of predefined altitudes and for excessive bank angle.
(c) Terrain Display
The T
2
CAS TAWS function provides two outputs to ARINC 708A compatib le
displays to provide terrain--related information to the crew through the weather
radar or EFIS displays in order to enhance flight crew situational awareness.
When no threat is perceived, the TAWS display shows with different levels of
colors, the height of the surrounding terrain relative to the aircraft altitude and
taking into account the aircraft flight path angle. Upon detection of a potential
CFIT threat, the terrain texture is modified on the terrain map in order to identify
the location and level (caution/warning) of the threat.
(3) RWS Functional Description
T
2
CAS may incorporate optionally a Reactive Windshear feature as part of its basic
functionality. This feature conforms to the Windshear Warning capabilities described
in TSO C117a without the guidance feature. The reactive Windshear Warning
algorithm continuously monitors wind factors that affect aircraft performance on both
take-- off and landing approach, in order to identify the presence of a severe
low-- level, downburst/microburst--type windshear.
If these wind factors cause aircraft performance to decrease to a predetermined
level, an audio warning is sounded, indicating to the crew that the aircraft net
performance capability is deteriorating and rapidly approaching a critical state. In
addition to the warning, the Windshear Warning algorithm provides a caution when
an increasing--performance Windshear is detected, thus giving advance warning of
decreasing -- performance windshear.
(4) GPS Functional Description
The T
2
CAS may optionally incorporate a Global Positioning System (GPS) receiver.
The GPS receiver is a CCA that is independent of both TCAS and TAWS/RWS, and
has an independent processor and I/O circuitry. The GPS receiver is manufactured
and supplied to ACSS by CMC Electronics. The GPS receiver is capable of providing
position information to the T
2
CAS a s well as to othe r aircraft systems.
B. System Configurations
The T
2
CAS may be installed in different aircraft configurations depending on the current
TCAS, TAWS/RWS and GPS equipment installed on the aircraft. The T
2
CAS uses an
Airplane Personality Module (APM) to hold aircraft specific configuration data for TAWS
and RWS functions. The APM is used in place of program pin inputs to provide system
configuration. An Aircraft Specific Database (ASDB) provides the aircraft specific
interface requirements for the T
2
CAS System and is loaded into the APM at the time of
system installation.