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SSFDR
The Solid State Flight Data Recorder (SSFDR) stores,
in a solid state memory located in a crash and fire
protected housing, the data of the last 25 hours
collected by the FDIU.
It is located in the unpressurized area of the rear
fuselage.
LINEAR ACCELEROMETER
The Linear Accelerometer (LA) is located close to the
aircraft Center of Gravity.
The Linear Accelerometer measures the acceleration of
the aircraft in all three axes (X, Y, Z).
The System Data Acquisition Concentrators (SDACs)
digitalize the analog signal of the Linear
Accelerometer and then send it to the FDIU.
DFDR EVENT PUSHBUTTON
A DFDR EVENT pushbutton is installed to record an event
mark in the SSFDR memory.
It is located on the cockpit center pedestal.
GND CTL PUSHBUTTON
The SSFDR is automatically supplied from the first
engine start up to five minutes after the last engine
shutdown.
The GrouND ConTroL (GND CTL) pushbutton enables the
SSFDR to be supplied, via the power interlock circuit,
when the aircraft is on the ground for preflight check
before engine start or for test and maintenance
purposes.
It is located on the ReCorDeR (RDCR) panel of the
overhead panel.
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DFDRS: DFDRS PRESENTATION
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DFDRS: DFDRS PRESENTATION
QAR
The optional Quick Access Recorder (QAR) records the
same parameters and is supplied in the same conditions
as the SSFDR.
The recording is made on a magnetic tape or an optical
disk. In case of an optical disk storage media, the
QAR is called Optical QAR (OQAR).
The QAR is dedicated to ground performance, maintenance
or condition monitoring tasks.
It is located in the aft avionics rack.
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SELF EXAMINATION
What is the purpose of the DFDRS?
A - Condition monitoring of the engines.
B - To record mandatory parameters.
C - To record parameters in a solid state
memory for ground maintenance.
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31 - INDICATING/RECORDING SYSTEMS
31-33-00 DFDRS: DFDRS
DESCRIPTION/OPERATION
CONTENTS:
FDIU
SSFDR
QAR
Linear Accelerometer
Self Examination
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DFDRS: DFDRS DESCRIPTION/OPERATION
FDIU
The Flight Data Interface Unit (FDIU) receives discrete
and digital parameters and processes them.
The functions of the FDIU are:
- Conversion,
- comparison,
- check and Built-In Test Equipment (BITE).
The FDIU converts the input parameters into a
recordable format for recorders:
- HARVARD BIPHASE for the Solid State Flight Data
Recorder (SSFDR),
- 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.
SSFDR
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
　
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