R **ON A/C 106-149, 211-299, 301-399, 401-499,
C. Digital Flight Data Recorder (DFDR) (Ref. Fig. 011A, 012A) The DFDR is a solid-state flight-data recorder in compliance with ARINC
717. The DFDR stores all aircraft information in CMOS bulk erasable EEPROM (Flash Memory IC) devices. Being a solid state device, the DFDR has no moving parts. The recorder can store all data which the FDIMU has collected over the last 25 hours. It is possible to store more than 25 hours of data if the correct combination of DFDR capacity and data rate are used.
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Digital Flight Data Recorder
Figure 011
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Digital Flight Data Recorder
Figure 011A
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DFDR - Functional Block Diagram
Figure 012
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DFDR - Functional Block Diagram
Figure 012A
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**ON A/C 001-049, 051-099, 101-105, 151-158, 201-209,
(1) Interface (Ref. Fig. 013) The data input/output is connected to the FDIU (ARINC 429). The DFDR transmits a time synchronization signal (GMT) once every 4 sec. at the rate of 768 bits/sec (64 words/sec.) or every 2 sec at the rate of 1536 bits/sec (128 words/sec). An optional interface allows to recover data by an airborn data loader (ADL) via ARING 615. Recovery of stored data occurs at 10 or 100 K/BIT as specified by ARING 615. Real time data is available at 9600 baud rate.
R **ON A/C 106-149, 211-299, 401-499,
(1) Interface
(Ref. Fig. 013A) The data-input and data-output are connected to the FDIU-part of the FDIMU via the rear connector. The format on this line is coded in HARVARD BIPHASE with 128 or 256 words/s.
The DFDR STATUS-signal and the DFDR BITE-signal, which indicates the correct operation of the DFDR, is continuously monitored by the FDIU-part. The result can be checked via the CFDS-function.
It is possible to download recorded data on ground via the front-connector of the DFDR.
**ON A/C 159-199, 210-210,
R R R R (1) Interface (Ref. Fig. 013) The data input/output is connected to the FDIU (ARINC 429). The DFDR transmits a time synchronization signal (GMT) once every 4 sec. at a rate of 1536 bits/sec (128 words/sec.). An optional interface allows to recover data by an airborne data loader (ADL) via ARING 615. Recovery of stored data occurs at 10 or 100 K/BIT as specified by ARING 615. Real time data is available at 9600 baud rate.
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DFDR - Interface
Figure 013
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DFDR - Interface Figure 013A
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**ON A/C 301-399,
(1) Interface
(Ref. Fig. 013A)
The data-input and data-output are connected to the FDIU-part of the
FDIMU via the rear connector. The format on this line is coded in
HARVARD BIPHASE with 128 words/s.
The DFDR STATUS-signal and the DFDR BITE-signal, which indicates the
correct operation of the DFDR, is contiuously monitored by the
FDIU-part. The result can be checked via the CFDS-function.
It is possible to download recorded data on ground via the
front-connector of the DFDR.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
(2) DFDR Functions Data is stored in shock protected solid state nonvolatile memory device (CMOS). The recorder receives 64 words/sec or 128 words/sec series messages from the Flight Data Interface Unit (FDIU). The write mode is a single channel incremental block recording with inter-record gaps between each data block. One data block contains data received during one second (768 BITS). Throughout this recording phase the DFDR continuously monitors its correct operation. If an abnormality occurs during this time it is automatically memorized (BITE function). The recording duration of the recorder is 25 hours under normal flying conditions. After the aircraft has landed, the memorized data can be transferred for analysis.
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