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  EE6900 Flight Management Systems “Aircraft Communications and Reporting System”  Dr. Maarten Uijt de Haag  Ohio University  References ãEd Flynn, “Understanding ACARS,” Third Edition . ã“Introduction to ACARS”ã  ARINC 702- 6, “Flight Management Computer System,” June 10, 1994. ãARINC 619, “  ACARS Protocols for Avionic End Systems.”ãSITA, “AIRCOM Services,” Ekaterinburg, October 2009. ã Hugo Teso , “Aircraft Hacking”, April 2013. 2  Data Communication -ACARS ã  Aircraft Communications and Reporting System (ACARS) ã For transmission of data not voice. ã Character-oriented  – Send 7-bit characters  – Maximum message of 220 characters ã Modulation on VHF band:  – 2400 bps (bits-per-second) over AM (amplitude modulation) using MSK (Minimum Shift Keying) in the 25kHz channels. ã Many messages are generated automatically based on discrete events:  – i.e. Doors closed and parking brake released;  – i.e. Weight-on-wheels sensor transition from no weight to weight. ã  ACARS Management Unit (MU) and a Control Display Unit (CDU) 3  ACARS VHF Frequencies 4
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