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CTA-81B
Clockwise
Test
Position
Post Flight
Reports
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ACS-5059 • Rev 5 - 02/2000
Collision Avoidance System User’s Manu a l
Glossary of
TCAS Terms
A b b r e v i a t i o n s
a n d
D e f i n i t i o n s
AFM Airplane Flight Manual.
AGL Above Ground Level.
ATC Air Traffic Control.A federally operated
ground based system that manages aircraft
traffic flow.
ATCRBS ATC Radar Beacon System.A ground
based secondary radar and airborne
transponder system used to monitor
traffic.
Absolute Altitude above terrain.Also called Radio
Altitude Altitude.Absolute altitude is received
from a radio altimeter and used by the
TCAS processor to determine distance
to the surface.
Altitude Tag Data tag shown above or below threat
symbol giving the relative altitude of
the intruder.
BITE Built In Test Equipment.A feature of
TCAS that continually monitors itself for
operational errors.
CPA Closest Point of Approach.Refers to predicted
point at which the intruder will
be closest to your own aircraft.
Crossover The maneuver that TCAS has deter-
Climb, mined to be appropriate is a climb
Crossover or descent through the altitude of the
Descent threat aircraft.The crew is alerted to
the crossover maneuver by an audio
message.
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Collision Avoidance System User’s Manu a l
G-Force The ratio between a given load and the
pull of gravity. For TCAS purposes,
G-forces of an RA could reach ±.35 during
an increase or reversal of the original
command.
Increase An increase maneuver is a change of the
Maneuver original Resolution Advisory command,
either climb or descent, requiring a
greater rate.The increase maneuver
could require G-forces to reach approximately
±.35.
Indicated Altitude shown on the altimeter with
Altitude barometric correction setting set to the
local sea level pressure.Used by the
crew below 18,000 feet but not used
for TCAS processing.
Intruder Any aircraft that is in the surveillance
range of TCAS.
LRU Line Replaceable Unit.A self-contained
avionics component that can be
replaced in the field.
Mode A ATCRBS transponder that replies to ATC
Transponder interrogations sending identification
code but without giving altitude data.
Mode C ATCRBS transponder that replies to ATC
Transponder interrogations giving identification code
or encoded altitude data.
Mode S Transponder that replies to ATC interro-
Transponder gations giving an ATCRBS identification
code,encoded altitude and other data
fields including aircraft discrete address.
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Collision Avoidance System User’s Manu a l
MOPS Minimum Operational Performance
Standards per RTCA document DO-185.
TCAS II Change 6.04a is specified by
DO-185.TCAS II Change 7.0 is specified
by DO-185A.
NAR Non-Altitude Reporting traffic.
Non-Threat An aircraft that has entered the TCAS
Intruder surveillance volume at a greater distance
than 6 miles or altitude greater
than 1200 feet above or below your
own.
Pressure Indicated altitude when barometric
Altitude pressure is set to 29.92”Hg (1013.15
mb).Pressure altitude is used by TCAS
to determine the relative altitude of
traffic.
Proximity An aircraft that is within 6 miles range
Intruder and with 1200 feet above or below our
own aircraft but does not meet the
TCAS definition of a threat.
Rad Alt Radio Altitude.Altitude received from a
radio altimeter and used by TCAS to
determine distance to the surface.See
Absolute Altitude.
RA Resolution Advisory. An audio and visual
indication recommending a vertical
maneuver to achieve or maintain separation
from an intruding aircraft.
RA/VSI Resolution Advisory/Vertical Speed
Indicator. A flight instrument that gives
standard VSI indication plus RA climb
and descend requirements.
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Collision Avoidance System User’s Manu a l
Relative The difference in altitude between two
Altitude aircraft.TCAS calculates relative altitude
as the difference between your own aircraft’s
pressure altitude and the encoded
pressure altitude of the intruder.
Reversal A reversal maneuver is a change of the
Maneuver original Resolution Advisory command
from a climb to a descent or vice-versa.
The reversal maneuver could require
G-forces to reach approximately ±.35.
　
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