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contains data received during one second.
The SSFDR includes BITE functions. The SSFDR status
signal is sent to the Centralized Fault Display
Interface Unit (CFDIU) through the FDIU and to the
ECAM through the System Data Acquisition Concentrators
(SDACs).
The SSFDR energization is controlled through the power
interlock circuit.
The Underwater Locator Beacon (ULB) located on the
front face of the SSFDR enables the location of the
recorder if the aircraft is immersed in water following
an accident. The ULB is equipped with a battery which
is activated by both fresh and salt water.
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DFDRS: DFDRS DESCRIPTION/OPERATION
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DFDRS: DFDRS DESCRIPTION/OPERATION
QAR
The Quick Access Recorder (QAR) stores the same data
as the SSFDR for on ground performance, maintenance
or condition monitoring tasks.
The data frames stored in the QAR are identical to the
SSFDR data frames.
The QAR includes BITE functions. The QAR status signals
(QAR MEDIA LOW, QAR FAIL) are sent to the lamps on its
front face and to the CFDIU through the FDIU.
The QAR energization is controlled through the power
interlock circuit.
LINEAR ACCELEROMETER
The task of the Linear Accelerometer (LA) is to measure
the acceleration of the aircraft in all three axes.
The range of measurement is:
- Vertical axis (Z) : -3 to +6 g,
- longitudinal axis (X) : -1 to +1 g,
- lateral axis (Y) : -1 to +1 g.
The Linear Accelerometer generates an analog signal
which is sent to the SDACs. This signal is digitalized
and sent to the FDIU through an ARINC 429 bus.
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SELF EXAMINATION
Which one is an FDIU function?
A - To compare the data recorded by the
SSFDR with the data sent by the FDIU.
B - To compare the data recorded by the QAR
with the data sent by the FDIU.
C - A & B.
How is the SSFDR energized?
A - Directly from the busbar.
B - Through the FDIU.
C - Through the power interlock circuit.
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31 - INDICATING/RECORDING SYSTEMS
31-33-00 DFDRS: DFDRS WARNINGS
CONTENTS:
DFDR FAULT
FDIU FAULT
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DFDRS: DFDRS WARNINGS
DFDR FAULT
Flight safety is not affected by the failure of the
Digital Flight Data Recorder (DFDR) although there is
only one.
FDIU FAULT
Flight safety is not affected by the failure of the
Flight Data Interface Unit (FDIU) although there is
only one.
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