AIRPLANE
OPERATIONS
MANUAL
CREW
AWARENESS
REVISION 39
2-04-40
Page
1
Code
01
AOM-145/1114
TRAFFIC AND COLLISION AVOIDANCE
SYSTEM
GENERAL
The EMB-145 is equipped with a Traffic and Collision Avoidance
System (TCAS), which provides the flight crew with an indication of
possible in-flight traffic conflict. The system is based upon transponder
signals and provides visual and aural warnings, as well as
recommended evasive action.
The EMB-145 may be equipped with TCAS software version 6.04A,
with TCAS software version 7.0 or with TCAS software version 7.1.
The TCAS 2000 presents the same operational characteristics of the
TCAS II.
The TCAS software version 7.0 presents the following differences
when compared to the TCAS software version 6.04:
− The altitude separation thresholds for issuing Traffic Advisory
(TA) and Resolution Advisory (RA) between FL300 and FL420
are reduced for compatibility with RVSM flight operations.
− The thresholds for issuing RA for airplanes closing in altitude
are reduced between the FL200 and FL420.
− Reduction in the numbers of RA eliminating those airplanes that
are expected to pass with sufficient horizontal range separation.
− Allows RA direction reversion, i.e., change a CLIMB to a
DESCENT and vice-versa in coordination with another TCAS
equipped airplane.
− Introduction of three additional RA.
− Different set points and range of actuation, as presented in the
following text.
The difference presented by TCAS software version 7.1 when
compared to the TCAS software version 7.0 is the replacement of the
corrective RA voice message “Adjust Vertical Speed, Adjust” with a
single “Level Off, Level Off” RA.
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