.  
BIPOLAR RZ for the optional Quick Access Recorder (QAR).

The FDIU compares the data that it sends with the data recorded by the SSFDR. The recorded
data is transmitted back to the FDIU through the playback data bus.
The FDIU checks the integrity of the mandatory parameters during the flight. After the flight,
engines shutdown, only the Linear Accelerometer signal check is done. The FDIU includes BITE
and monitoring functions.

The Solid State Flight Data Recorder (SSFDR) stores data which the FDIU has collected during
the last 25 hours. The data is recorded in data frames. Each frame 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.

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 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 power up is
controlled through the power interlock circuit. The QAR is not crash protected. This unit is
designed to provide quick and easy access to a removable medium, such as an optical disk or
PCMCIA card, on which flight information is recorded.

QARs have now been developed to record an expanded data-frame, sometimes supporting
2000+ parameters at much higher sample rates than the FDR. The expanded data-frame greatly
increases the resolution and accuracy of the ground analysis programs.

FOM OVERVIEW

Aircraft Integrated Data System
The Aircraft Integrated Data System (AIDS) is used to monitor various aircraft system parameters in order to make maintenance easier and to allow formulating operational recommendations. The AIDS consists of a Data Managements Unit (DMU) connected as shown below. An optional Digital AIDS Recorder (DAR) may be installed.
The Data Management Unit (DMU) is basically equipped with 2 microprocessor boards:
.  
The first one (master) is in charge of the data input/output and the processing of reports.

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The second one (slave) is in charge of the Digital AIDS Recorder (DAR) and Smart AIDS Recorder (SAR) processings. The SAR memory is part of this board.
　
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