ACARS Messages

This 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 me know.

.CSV File
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 e
ach 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 line.

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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