User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Table 1-13: T
3
CAS Failure Classification
Function
No.
Function Description
Hazard
Classification
T
3
CAS
Development
Level/Rigor
1
TCAS: Incorrect Resolution Advisory
Hazardous
AC20-151A
Hazardous
2
Transponder Mode S Operation:
Incorrect Transponder Response to SSR
Major
TSO-C112/112d
Hazardous
3
Transponder to TCAS Coordination:
Incorrect Transponder Response to
TCAS Interrogation
Hazardous
Hazardous
4
Windshear Detection: Un-annunciated
loss of false annunciation of reactive
windshear alert
Major
AC25-12
Major
5
TAWS/GPWS: Un-annunciated failure,
hazardously misleading information
(HMI), and false alerts.
Major
AC25-23
Major
6
ADSB-OUT: Incorrect Transponder ADS-
B Message Output
Major
AC20-165A
Hazardous
7
ADS-B IN: Corruption of ADS-B IN
Reports
Major
Hazardous
8
ADS-B IN: Incorrect Display of Traffic
(AIRB/VSA)
Major
Hazardous
9
ADS-B IN, ITP: Incorrect ITP Distance
Major
Hazardous
NOTE1:
NOTE2:
NOTE3:
Hazards with classifications less than Major are not listed in this table.
Due to the above Hazard Classifications, the T
3
CAS software was developed to RTCA
DO-178B Design Assurance Levels C (Major) and B (Hazardous) as indicated above.
Due to the above Hazard Classifications, the T
3
CAS airborne electronic hardware was
developed to RTCA DO-254 Design Assurance Level B (Hazardous).
B. System Functional Description
(1) TCAS Functional Description
Situational awareness is provided to the flight crew by aiding in visually acquiring
intruding aircraft and discriminating between the intruding aircraft, threat aircraft,
and other traffic in the airspace.
Vertical guidance to avoid midair collisions is accomplished by interrogating the
Mode A, Mode C, and Mode S transponders of potential threat aircraft, tracking
their responses, and providing advisories to the flight crew to assure vertical
separation.
The first two levels of situational awareness include:
1-26
04 Nov 2014
34-45-29
Pub. No. 8600200-001, Revision 004
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