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- Recording of parameters in an internal memory
(SAR) and on an external recorder (DAR).
AIRCRAFT SYSTEMS
Various aircraft systems are connected to the DMU.
These input sources provide the DMU with approximately
13000 parameters fed from 35 computers through 50 ARINC
429 buses.
FDIU
The Flight Data Interface Unit (FDIU) sends various
parameters to the mandatory flight data recorder.
The same parameters are sent by the FDIU to the DMU
so that they can be recorded on the DAR, if installed.
DAR
The Digital AIDS Recorder (DAR) records parameters,
delivered by the DMU, on a magnetic tape or an optical
disk.
In case of an optical disk storage media, the DAR is
called Optical DAR (ODAR).
The data is transmitted from the DMU to the DAR in
HARVARD BIPHASE format as from the FDIU to the
mandatory flight data recorder.
SAR
The Smart AIDS Recorder (SAR) is an integrated part
of the DMU.
The purpose of the SAR is to record parameters relating
to particular flight events detected by the DMU.
The recording of parameters is performed in a
compressed form on the 2 Mbytes of the SSMM reserved
for SAR memory.
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PDL
The test connector mounted on the front panel of the
DMU enables a Portable Data Loader (PDL) to be
connected.
The PDL is used to:
- upload data into the DMU (DMU operational
software, DMU customer database),
- download data on a 3.5 inch floppy disk for
GSE analysis (SAR data, reports).
PCMCIA INTERFACE
The Personal Computer Memory Card International
Association (PCMCIA) interface is an integrated part
of the DMU. This interface accepts high capacity and
removable PCMCIA disks.
Independently from the recording in the DAR and the
DMU, the DAR and SAR data as well as the reports can
be automatically recorded in the inserted PCMCIA disk.
A PCMCIA disk space ratio reserved for DAR, SAR and
reports recording is programmable by the GSE. As a
default, the whole disk space is allocated for DAR
recording.
The PCMCIA interface can also be used as a portable
data loader to upload the DMU operational software and
customer database and to download the SAR data and
reports.
GSE
The Ground Support Equipment (GSE) is based on a
compatible personal computer able to read 3.5 inch
floppy disks and, as an option, PCMCIA disks.
The GSE software provides the following main functions:
- Reconfiguration function: Generation and
edition of the DMU customer database (trigger
conditions, layout of print reports, DAR and
SAR recording map, ...).
- Read out function: Display, print out and
analysis of the SAR data and reports.
The GSE also allows the output of reports in
a format compatible with external programs such
as trend monitoring programs.
NOTE: The Analysis Ground Station (AGS) software is
another tool providing the same analysis
features for DAR data as the GSE for SAR data.
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MCDU
Both Multipurpose Control and Display Units (MCDUs)
are connected to the DMU to display data, program and
also control the system.
Compared to the GSE, the programming facilities offered
by the MCDU are very limited.
The main functions of the MCDU within the AIDS are:
- online display of selected aircraft parameters,
- display of the list of the stored reports and
SAR files,
- manual request of reports and SAR/DAR
recording.
PRINTER
The printer is used to print reports generated by the
DMU as well as most of the AIDS MCDU displays.
The printer can be automatically controlled by the
DMU, manually controlled from the MCDU or activated
using the AIDS PRINT pushbutton.
ATSU
The Air Traffic Service Unit (ATSU) can be used to
send reports and to broadcast parameters generated by
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