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CONTENTS:
General
Control Panel
Transponder
Antennae
Suppressor
ADIRU
FMGC
CFDIU
TCAS
Self Examination
TMUATCA04 LEVEL 3
EFFECTIVITY 34-52-00 Page 1
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 411
ALL
ATC DESCRIPTION/OPERATION
GENERAL
The Air Traffic Control (ATC) system includes:
- 1 control panel (common to both systems and
TCAS),
- 2 transponders,
- 4 antennae.
CONTROL UNIT
A single ATC/TCAS control panel enables system
selection. It provides the selected transponder with
code and function data and,in return, receives status
data.
The ATC control panel converts selected mode and
selected code data into digital data and transmits
this data in ARINC 429 format to the selected
transponder.
The Landing Gear Control and Interface Units (LGCIUs)
provide a ground/flight signal to the ATC transponder
via the ATC control panel for BITE purposes.
TRANSPONDER
In normal operation, one ATC transponder operates and
the other is in standby mode.
The operating mode (A, C or S) of the transponder is
determined by the decoding of the time between the
interrogation pulses.
The main function of the mode S transponder is
surveillance. Each transponder has its own and unique
address coded on 24 bits so that every interrogation
can be directed to a specific aircraft preventing
multiple replies.
The mode S is also used in collision avoidance (TCAS).
ANTENNAE
The ATC antennae transmit replies to interrogations
from the ATC ground station. Top and bottom antennae
provide the antenna diversity features that allow a
better radar coverage.
The antenna operates in the 960 MHz to 1220 MHz
frequency band with an interrogation frequency of
1030 MHz and a reply frequency of 1090 MHz.
SUPPRESSOR
The ATC, the DME and the TCAS operate in the same
frequency range. A suppressor signal is transmitted,
via a coaxial, by the operating system to inhibit the
other systems and to prevent simultaneous
transmission.
ADIRU
ADIRU 1 and ADIRU 2 provide barometric altitude to
associated transponders for mode C.
In case of failure of ADIRU 1 or 2, the pilot can
switch to ADIRU 3 through the AIR DATA selector switch.
FMGC
The Flight Management and Guidance Computers (FMGCs)
provide the flight number.
This data will be transmitted to an ATC ground station
after a mode S interrogation.
TMUATCA04-T01 LEVEL 3
EFFECTIVITY 34-52-00 Page 2
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 412
ALL
TMUATCA04-P01 LEVEL 3
ATC DESCRIPTION/OPERATION
EFFECTIVITY 34-52-00 Page 3
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
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ALL
ATC DESCRIPTION/OPERATION
CFDIU
The Centralized Fault Display Interface Unit (CFDIU)
allows testing and trouble-shooting of the ATC system
through the Multipurpose Control and Display Units
(MCDUs).
The tests are only available on ground.
TCAS
The Traffic Collision Avoidance System (TCAS) allows
individual communications with each TCAS equipped
aircraft through the Mode S transponder.
This enables a coordination of avoidance manoeuvers
by acquisation, at regular intervals, of the relative
altitude and the separation range.
TMUATCA04-T01 LEVEL 3
EFFECTIVITY 34-52-00 Page 4
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 414
ALL
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TMUATCA04 LEVEL 3
EFFECTIVITY 34-52-00 Page 5
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 34 NAVIGATION
UF94200
EFFECTIVITY Page 415
ALL
SELF EXAMINATION
The ATC transponders and DME transponders are:
A - Connected by ARINC buses to exchange
distance data.
B - Connected by a suppressor coaxial which
transmits an analog signal preventing
simultaneous transmission.
C - Not connected.
If ADIRU 2 fails, is the ATC 2 transponder still
able to operate in altitude reporting mode?
A - Yes, because altitude data is
automatically received from ADIRU 3.
B - Yes, because altitude data will be
recovered after manual switching of the
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