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ALL
BRAKING AND STEERING - BSCU CONTROL INTERFACES
ADIRUs
The aircraft reference speed for nose wheel steering
and anti-skid functions is obtained by processing the
inertial deceleration from the Air Data Inertial
Reference Units (ADIRUs).
SECs
Two of the three ground spoilers extended signals
coming from the Spoiler Elevator Computers (SECs) must
be present to enable automatic braking.
LGCIUs
Inputs from both Landing Gear Control and Interface
Units (LGCIUs) serve for braking and nose wheel
steering functions control logic.
ELACs
The link between the BSCU and the Elevator Aileron
Computer (ELAC) serves for nose wheel steering purposes
with orders coming from rudder pedals and autopilot.
BTMUs
The BSCU changes analog signals from the Brake
Temperature Monitoring Units (BTMUs) into digital ones
for temperature indication on the lower ECAM display
unit.
TACHOMETERS
Tachometers send wheel speed values to the BSCU
enabling reference speed computation and also to the
Spoiler Elevator Computers for ground spoilers
extension logic.
LGCIUs
Landing Gear Control and Interface Units receive wheel
speed indications.
These signals are used for BITE inhibition.
PACK CONTROLLERS
After wheel speed computation the BSCU energizes wheel
speed relays.
The latter send a signal to the Pack Controllers for
pack ram air inlet operation during take-off and
landing phases.
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32 - LANDING GEAR
32-42-00 BRAKING AND STEERING - BSCU
ARCHITECTURE AND MONITORING
INTERFACES
CONTENTS:
Architecture
Monitoring
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BRAKING AND STEERING - BSCU ARCHITECTURE AND MONITORING INTERFACES
ARCHITECTURE
The Braking/Steering Control Unit (BSCU) is made up
of two identical sets of three boards which form the
systems 1 and 2.
At each energization the system supplied first takes
control.
If there is a disagreement between the control and the
monitoring channels, the corresponding system is
disengaged and the system in standby takes over.
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BRAKING AND STEERING - BSCU ARCHITECTURE AND MONITORING INTERFACES
MONITORING
CFDIU
The BSCU sends BITE data to the Centralized Fault
Display System (CFDS) by a bi-directional ARINC 429
link. This link permits transmission of the failure
messages.
SDAC
The System Data Acquisition Concentrators (SDACs)
receive ARINC 429 bus signals for acquirement and
processing of all the data necessary for the generation
of warnings.
FDIU
The Flight Data Interface Unit collects braking system
data (braking pressure, braking pedal position,
autobrake status) in order to send them to the flight
data recorder.
DMU
The Display Management Unit receives maintenance data
for reports used in preventive maintenance. The Display
Management Unit (DMU) is a computer of the Aircraft
Integrated Data System (AIDS)(as an option, AIDS may
not be installed).
FMGC
The BSCU sends 4 availability discretes to the Flight
Management and Guidance Computers (FMGCs). This is to
meet the safety requirements of a category 3B landing.
　
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