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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-45-00-009
General
The TCAS uses a top and bottom directional antenna. The
antennas are the same and interchangeable.
Physical Description
The directional antenna is a phased array antenna. There are
four array elements on the antenna. Each element has a color
coded connector. The TCAS computer sends transmit
interrogation signals to the array elements with different
phases. This makes the interrogation signal directional.
To attach the antenna cables, connect each coaxial cable with
the array element connector that has the same color band.
Four screws attach the antenna to the airplane. The radiation
side of the antenna shows FWD and DO NOT PAINT.
CAUTION: DO NOT PAINT THE RADIATION SURFACE OR THE
BACKPLATE OF THE ANTENNA. PAINT DOES NOT
PERMIT THE ANTENNA TO RADIATE OR RECEIVE
RF SIGNALS.
CAUTION: TO PREVENT DAMAGE TO THE ANTENNA
CABLES, DO NOT PULL ON THEM.
Training Information Point
An antenna connection includes the coax cable and an antenna
element. The TCAS computer checks the resistance of each
antenna connection at power-up. The TCAS computer reports
an antenna fault when it detects that the resistance of the
connection is out of range. If you do not connect the coax cable
to the correct element, the TCAS computer reports an antenna
fault.
TCAS - TCAS DIRECTIONAL ANTENNA
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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TCAS - TCAS DIRECTIONAL ANTENNA
TCAS - TCAS DIRECTIONAL ANTENNA
EFFECTIVITY
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TCAS - TCAS DIRECTIONAL ANTENNA
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The TCAS computer transmits interrogations to and receives
replies from other airplanes. Airplanes that are tracked by
TCAS are called targets. The TCAS computer uses these
replies and data from other airplane systems to calculate if a
target is a collision threat. The TCAS computer can
communicate with other airplanes that have TCAS. The two
TCAS computers can use the shared data to perform
coordinated maneuvers and avoid potential collisions.
The TCAS computer also gets analog and digital inputs from
other airplane systems. These inputs control TCAS and provide
data for TCAS to track intruders. The TCAS computer sends
display data to the common display system (CDS) display
electronic units (DEUs).
The TCAS computer has these circuits:
* Input/output (I/O)
* Speech Processor
* Central processing unit (CPU) and memory
* Suppression circuit
* Signal Processor
* Receiver
* Transmitter
* Beam steering and attenuator
* BITE.
I/O
The I/O circuit gets this on-board airplane systems data:
* Magnetic heading data from the left ADIRU
* Coordination and control data from the ATC transponder
system
* Barometric altitude from the left or right ADIRU from the
active ATC
* Radio altitude from the radio altimeters
* Resolution advisory status from the DEUs
* Landing gear down discrete from the landing gear lever
switch
* Aural inhibit discrete interface with the GPWC
* Aural inhibit discrete interface with the weather radar
* Air/ground data from the PSEU.
Program pins set these parameters in the TCAS computer:
* Altitude limits
* Aural warning volume levels
* Self test inhibits
* Standby on ground
* Intruders on ground disabled.
The I/O circuits send this data to the CPU.
TCAS - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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CPU
The CPU gets the data from the inputs of the I/O and puts it into
memory. The CPU combines the input data and the data it
receives from the signal processor. The CPU makes the
necessary calculations for the TCAS displays and aural
messages.
The CPU sends TCAS display data to the CDS DEUs. It shows on
these indicators:
* Attitude indicators (AI)
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