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and 2 transceivers although only one input is necessary for
TCAS operation. The data is used by the TCAS computer to
calculate some sensitivity levels.
At approximately 1700 feet, the TCAS computer uses radio
altitude together with barometric altitude to determine intruders
that are on the ground and therefore no threat to the TCAS
airplane.
At 1000 feet radio altitude, the TCAs computer inhibits
resolution advisories and TA ONLY will show on the NDs.
TCAS Inputs from ADIRU
The left ADIRU supplies these inputs to the TCAS computer:
* Airplane roll attitude
* Airplane pitch attitude
* Airplane heading.
NOTE: Airplane heading is the only ADIRU input used by the
TCAS computer.
TCAS - DIGITAL INTERFACES
EFFECTIVITY
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TCAS Outputs to DEUs
The TCAS computer supplies resolution advisory (RA) and
traffic advisory (TA) data to the DEUs. This includes all traffic
data for TCAS displays.
TCAS Outputs to the FDAU
The FDAU receives the same TCAS data that goes to the DEUs.
TCAS - DIGITAL INTERFACES
EFFECTIVITY
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TCAS - DIGITAL INTERFACES
TCAS - DIGITAL INTERFACES
EFFECTIVITY
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Purpose
The TCAS computer is the main component of the TCAS. It
controls these functions:
* Surveillance
* Tracking
* Advisory
* Air-to-air maneuver coordination.
The TCAS computer sends signals which tell the flight crew to
make one of these maneuvers:
* Keep the current flight plan
* Make flight maneuvers to prevent a possible collision with
other airplanes in the area.
Physical Description
The TCAS computer is a 6 MCU size unit. It weighs 28 lbs (11.3
kg).
Functional Description
The TCAS computer transmits 1030 MHz pulse-coded
interrogation signals. It receives 1090 MHz pulse-coded reply
signals from intruder airplanes with an ATC transponder.
Front Panel LED Indications
These are the status light emitting diodes (LEDs):
* A green PASS to show that there is no TCAS computer
failure
* A red FAIL to show a TCAS computer failure
* A red XPNDR to show an ATC transponder interface failure
* A red UPPER ANT to show a top TCAS antenna failure
* A red LOWER ANT to show a bottom TCAS antenna failure
* A red RAD ALT to show no radio altitude data from the RA
* A red HDNG to show no heading data from the ADIRU
* A red R/A to show a DEU display function failure
* The red T/A does not operate.
Front Panel Self-Test
You push the test switch on the front panel to start a test of the
TCAS. The LED indications come on to show system status.
TCAS - TCAS COMPUTER
EFFECTIVITY
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TCAS - TCAS COMPUTER
TCAS - TCAS COMPUTER
EFFECTIVITY
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General
The ATC/TCAS control panel controls the TCAS computer.
Function Select Switch
You use the function select switch to select one of these TCAS
modes:
* TA ONLY mode. This is the TA only mode. The display of RAs
is prevented.
* TA/RA mode. The displays show all targets. This is the
normal mode of operation for TCAS.
You can use the test button in the center of the switch to do a
test of the ATC and TCAS systems.
TCAS - ATC/TCAS CONTROL PANEL
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TCAS - ATC/TCAS CONTROL PANEL
TCAS - ATC/TCAS CONTROL PANEL
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