RECORDING SYSTEM COMPONENT LOCATION
SYSTEM OVERVIEW
The Flight Data Interface and Management Unit (FDIMU) has two
primary functions. The first is the Flight Data Interface Unit (FDIU)
function.
To obey the mandatory requirements of crash recording, the FDIU
acquires and formats several important flight parameters and system data
before it supplies them to the Solid State Flight Data Recorder (SSFDR).
The linear accelerometer measures the acceleration of the A/C in all three
axes. The System Data Acquisition Concentrator (SDAC) digitizes the
analog signal of the linear accelerometer and sends it to the FDIU.
For maintenance and performance purposes, the optional Quick Access
Recorder (QAR) records the same parameters as the SSFDR. The
operation of the SSFDR is automatic.
On the overhead panel, there is a GrouND ConTroL P/B, which is on the
ReCorDeR panel. This P/B lets the SSFDR be supplied when the A/C is
on ground for preflight checks before engine start or for tests and
maintenance. On the center pedestal, there is a Digital Flight Data
Recorder (DFDR) EVENT P/B, which can be used to set an event mark
on the SSFDR memory.
COMPONENT LOCATION
The DFDRS and AIDS computers are in the aft avionics rack.
About the QAR/DAR, there are several vendors of optical disk storage
media. The recorder is then called Optical QAR/DAR (OQAR/ODAR).
There is also a version from Teledyne that includes a GSM module for
data transmission called WQAR (Wireless GroundLink QAR).
The FDIMU computer is in the aft avionics rack.
The SSFDR is installed immediately above the Cockpit Voice Recorder
(CVR), in an unpressurized area of the rear fuselage.
The SSFDR stores the data of the last 25 hours collected by the FDIU.
The SSFDR stores these data in a solid state memory which is in a
crash-and-fire-protected housing.
The linear accelerometer is near the A/C center of gravity.
It sends the accelerations in the 3 axes (pitch, roll and yaw) to the DFDRS.
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