document shows the details of Aircraft Communications Addressing
and Reporting System (ACARS) messages sent to and received from
American Airlines Flight 11 (AAL11), United Airlines Flight 93 (UAL93)
and American Airlines Flight 77 (AAL77) on September 11th 2001. It was
obtained via a Freedom of Information Act (FOIA) request to National
Archives and Records Administration (NARA).
I have converted the document to a text
file (version 6). Where
two or more spaces occur together, I have converted them to a single
space. There are quite possibly some errors that I have made in the
conversion and I will update the files as I become aware of them.
If you find any, please let
I have also converted the document to a .CSV file
(version 6) which can be opened in Microsoft Excel or Microsoft
Access as well as other software.
The various parameters in each block appear as columns, for example the
number after FLoc= in each block appears in the FLoc column of the .CSV
file. There are also columns for the Block Type ( DLBLK, DLMSG, ULBLK,
ULMSG or ICPUL ), Media Dump for the section of ICPUL blocks that
starts with the words "Dumping Media" and Message Text for the section
of the block that starts with <CR><LF> or <SOH>.
Parameter values that are expressed both in
decimal and hexadecimal in
the text file are expressed only in decimal in the CSV file.
Each line in the Media Dump section of ICPUL blocks has
<CR><LF> appended to it before being concatenated together
in to a single value and each
line in the Message Text section of blocks are concatenated together in
to a single value.
A separate line appears in the CSV file for each pair of BEPStnName and
SSV values in DLBLK blocks with the other parameters duplicated on each
ACARS RGS Locations
I have converted the North American ACARS
RGS locations from pages 100 to 106 of this
document in to a .CSV
file (version 1). I have changed the longitude of the CPR RGS from
positive to negative. There are also some other RGS locations in the
document that are up to 60 nautical miles from airports with the same
code and so may also be incorrect.
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