General
The TCAS transmits to and receives signals from other
airplanes to get altitude, range, and bearing data. The other
airplanes report their own altitudes. The range of the other
airplanes is calculated by measurement of the time between the
transmission of an interrogation and the reception of a
response from the other airplanes. Bearing is calculated by
the use of directional antennas. TCAS uses these data and
inputs from other onboard airplane systems to provide visual
indications of the position of other airplanes and to provide
visual and aural traffic avoidance alerts.
General Description
These are the TCAS components:
* TCAS directional antennas (2)
* TCAS computer
* ATC/TCAS control panel.
TCAS interfaces with these other system components:
* ATC transponders (2)
* Landing gear lever
* PSEU
* Common display system (CDS) display electronic units
(DEUs) (2)
* Remote electronics unit (REU)
* Radio altimeters (2)
* Ground proximity warning computer (GPWC)
* Weather radar
* Left air data inertial reference unit (ADIRU)
* Suppression coax tees
* Flight data acquisition unit (FDAU).
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Electronic Equipment Compartment
The TCAS computer is in the electronic equipment
compartment.
Flight Compartment
These are the components in the flight compartment that
interface with TCAS:
* Left electronic flight instrument system (EFIS) control panel
* Left outboard display unit
* Left inboard display unit
* Right EFIS control panel
* Right outboard display unit
* Right inboard display unit
* ATC/TCAS control panel.
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General
The top TCAS directional antenna is at station 385 on top of the
fuselage. The bottom TCAS directional antenna is at station 305
on the bottom of the fuselage.
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General
The TCAS computer has analog and discrete interfaces with
these components:
* Top and bottom TCAS directional antennas
* Landing gear lever switch
* Proximity Switch Electronics Unit (PSEU)
* Ground proximity warning computer (GPWC)
* Weather radar
* DME/ATC/TCAS suppression coax tees
* Display electronic unit (DEU) 1 and 2
* Remote electronics unit (REU).
Program pins control the configuration of the TCAS computer.
Power
The TCAS computer gets 115v ac from AC transfer bus-1
through the TCAS circuit breaker on the P18 circuit breaker
panel.
Antennas
There are two TCAS directional antennas. The TCAS directional
antennas receive traffic airplane reply signals. They also
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