AIRPLANE
OPERATIONS
MANUAL
FLIGHT
INSTRUMENTS
REVISION 33
2-17-35
Page
1
Code
01
FLIGHT DATA RECORDER SYSTEM
The Flight Data Recorder System (FDRS) has been designed to
automatically acquire and record several airplane and system
parameters, without pilot action, from engine start to engine shutdown
on every flight.
The FDRS comprises the following units and components:
− One solid-state Flight Data Recorder.
− One underwater locator beacon attached to the Crash Survivable
Memory Unit (CSMU) case.
− One triaxial accelerometer.
− Five wirewound precision potentiometers.
− One impact switch.
− Two Data Acquisition Units (DAUs).
− One Auxiliary Flight Data Acquisition Unit (AFDAU) (optional).
− Five surface position sensors (optional).
− Eight load cells sensors to measure the pilot/copilot force into control
commands (optional).
− One Analog Digital Converter dedicated to load cells sensors
(optional).
An FDR malfunction is detected by means of the power-up built-in test
or the continuous self-checking test. An EICAS message is generated
to indicate the failure.
The CSMU is a shock-and-heat-resistant container, which records all
inputs in the last 25 hours, in a high-density solid-state memory.
The DAUs interface with various airplane systems, in order to supply
data to the FDRS.
The AFDAU is solely used for the FDR system and is the unit
responsible for receiving all airplane inputs (data to be acquired DAU's,
etc.) and sending them to the FDR unit.
An AFDAMU is an AFDAU plus a DMU. The function of the DMU is to
process data acquired by the DAU and additional parameters in order
to store them in a manner that can be easily accessed for analysis by
the operator. AFDAMU performs the function of AFDAU and QAR
equipment.
Operational data is recorded when the Red Beacon is switched ON or
the airplane is airborne.
The setting of the required flight number to be recorded, along with the
system data, is made on the clock as described in this section.
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