Global standards for ACARS were prepared by the Airlines Electronic Engineering Committee (AEEC). It also contained a MSK modem, which was used to transmit the reports over existing VHF voice radios. The original avionics standard was ARINC 597, which defined an ACARS Management Unit consisting of discrete inputs for the doors, parking brake and weight on wheels sensors to automatically determine the flight phase and generate and send as telex messages. Later, it was changed to 'Aircraft Communications, Addressing and Reporting System'. The original expansion of the abbreviation was 'Arinc Communications Addressing and Reporting System'. Teledyne Controls produced the avionics and the launch customer was Piedmont Airlines. In an effort to reduce crew workload and improve data integrity, the engineering department at ARINC introduced the ACARS system in July 1978, as essentially an automated time clock system.
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