R **ON A/C 106-149, 216-299, 401-499,
(2) DFDR Functions The DFDR stores digital flight data in a crash protected solid state memory. This solid state memory consists of a number of Flash EEPROM devices which will keep their contents if the power is removed. The DFDR is able to receive 64, 128 or 256 words/s series messages (ARINC 717 format) from the FDIU-part of the FDIMU. The data is recorded in 32K-Word Blocks divided in 512 logical pages of 64 words each. The first two pages contains header information (partition, channel and block number) and a bad page map. The remaining 510 pages stores the flight data.
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 31-33-00Page 69 1201-210, 216-299, 301-399, 401-499, 1Aug 01/05 1 1 1CES 1 1EFF : ALL 1 31-33-00Page 70 1 1 May 01/05 1 1 1CES 1
The SSFDR software monitors the correct recording operation
continuous and an incorrect function will be memorized (BITE).
The recording duration of the recorder is a minimum of 25 hours under
normal flight conditions. After the aircraft has landed, the
memorized data can be down loaded for analysis.
R **ON A/C 211-215, 301-399,
R (2) DFDR Functions
R Data is stored in shock protected solid state nonvolatile memory
R devices. The recorder is able to receive 64, 128 or 256 words/sec
R series messages from the FDIU-part of the FDIMU. The write mode is a
R single channel incremental block recording with inter-record gaps
R between each data block. One data block contains data received during
R one second. Throughout this recording phase the DFDR continuously
R monitors its correct operation. If an abnormality occurs during this
R time it is automatically memorized (BITE function). The recording
R duration of the recorder is 50 hours under normal flying conditions.
R After the aircraft has landed, the memorized data can be transferred
R for analysis.
**ON A/C ALL
(3) Underwater Locator Beacon (ULB)
A ULB is attached directly to the front-panel of the DFDR.
The ULB transmits a radio-signal. The ULB starts its operation if it
gets in contact with water. It has a detection range of 1800 to 3600
meter. The ULB operates in water at a depth of 6000 meter.
You can service the ULB without disassembly of the DFDR. Maintenance
has to be done at set times to replace the battery of the ULB.
D. Linear Accelerometer (LA)
(Ref. Fig. 014, 015)
The task of the LA is to measure the acceleration of the aircraft in all
three axis. The acceleration force moves a pendulum in the sensing
mechanism. A proximeter senses the movement which generates a signal
proportional in amplitude to the movement. A servo-amplifier amplifies
the signal to excite a torque coil installed on the pendulum. The current
which flows through the torque coil produces a force which is directly
proportional to the acceleration force. The voltage drop across a load
resistor connected in series with the torque coil is an accurate analog
signal of the acceleration and gives the input signal to the SDAC. The
null offset circuit lifts the null output signal to the required level.
At no acceleration, the lateral and longitudinal axis output signal is
2.6 V DC and the vertical axis output signal is 1.8 V DC.
Linear Accelerometer Figure 014
R 1EFF : 1 1 1CES ALL 1 111 31-33-00 Page 71 May 01/05
LA - Functional Block Diagram Figure 015
R 1EFF : 1 1 1CES ALL 1 111 31-33-00 Page 72 May 01/05
Range of measurement: - Vertical axis (z) = -3g to +6g - Longit. axis (x) = -1g to +1g - Lateral axis (y) = -1g to +1g
R **ON A/C 001-049, 051-099, 101-105,
E. Quick Access Recorder (QAR)
R **ON A/C 001-049, 101-105,
R (Ref. Fig. 016)
R **ON A/C 051-099,
R (Ref. Fig. 016A)
R **ON A/C 001-049, 101-105,
R (Ref. Fig. 017)
R **ON A/C 051-099,
R (Ref. Fig. 017A)
R **ON A/C 001-049, 051-099, 101-105,
R (Ref. Fig. 018) The purpose of the QAR is to store serial data on a optical disc for on-ground performance, maintenance or condition monitoring tasks (equivalent to the DFDR). The QAR can store data on an on-board rewritable optical disk. The quick access to the disk and the EJECT pushbutton is through a door, which is in the front panel of the QAR. The disk medium is a standard of 3 1/2" and a large storage capacity of 128M bytes per disk. The data are transmitted from the FDIU in RZ bipolar code with 64 or 128 words per second and 25 sectors per track. The standard is 128 words per second. The QAR complies generally with ARINC 591 and is connected to the FDIU.
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