program checks the Hamming
code and page parities of the raw Flight Data Recorder (FDR
commonly called "black box")
files that were read from Loral Fairchild Model F-2100 FDRs. It is a
modification of the program that checks the
FDR file for American Airlines Flight 77 (AAL77) which was read
from the same make and model of FDR.
Incorrect Hamming codes and page parities indicate data that has either
not been recorded correctly or not recorded completely or has been
corrupted after it has been recorded.
I have checked four FDR files for problems which can be downloaded from
Details of the FDR files are as follows:
The file American 77.fdr
the FDR file from AAL77 which I received in this
Information Act (FOIA) request to the United States National
Transportation Safety Board (NTSB) and is the only one of the four FDR
files that has incorrect Hamming codes and page parities.
The two files DCA02MA001_AAL587_ALL.fdr
are the two FDR files which I received in this
The file UR-DWH from RUAG Raw Data.FDR
is an FDR file that I received from a source other than the NTSB that
has kindly allowed me to make it publicly available.
can download the output text file generated by the program from here.
can download the text headers of the FDR files from here.
Information about the format in which the FDR records the data can be
found in this
post and in
figure 4.2-2 of this
of the program. I
used Microsoft Visual C# 2010 Express Edition to create it. You can
look at the .cs
source files using any text editor, and you can download
Visual C# 2010 Express Edition from Microsoft
it. Alternatively, you may be able to get a DVD with the Visual Studio
Express Editions from your local Microsoft sales office.
As I am providing this program free
of charge, it is provided as is.
I take no responsibility for what the program does or doesn't do.
However, you can email
feedback to me (Warren Stutt).
Change Log detailing the
changes in different versions is available here
Back to Warren Stutt's Home Page