The first day of ACARS operations saw about 4,000 transactions, but it did not experience widespread use by the major airlines until the 1980s.Įarly ACARS systems were extended over the years to support aircraft with digital data bus interfaces, flight management systems, and thermal printers. ![]() 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 an automated time clock system. ![]() Doing so also reduced the need for human radio operators to receive the reports. Airlines wanted to eliminate self-reported times to preclude inaccuracies, whether accidental or deliberate. The flight crews reported these times by voice to geographically dispersed radio operators. In many cases, the voice-relayed information involved dedicated radio operators and digital messages sent to an airline teletype system or successor systems.įurther, the hourly rates for flight and cabin crew salaries depended on whether the aircraft was airborne or not, and if on the ground whether it was at the gate or not. Prior to the introduction of datalink in aviation, all communication between the aircraft and ground personnel was performed by the flight crew using voice communication, using either VHF or HF voice radios. ![]() More ACARS radio stations were added subsequently by SITA. The protocol was designed by ARINC and deployed in 1978, using the Telex format. In aviation, ACARS ( / ˈ eɪ k ɑːr z/ an acronym for Aircraft Communications Addressing and Reporting System) is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. CCX said that it aimed to make the new testers easy to understand and replicable of Android and Apple smartphone and tablet graphical user interfaces.Aircraft digital message communication system Example of an ACARS message The testers have an internal antenna and can wirelessly collect data and transfer it to a maintenance repair shop’s internally used servers and electronic work order systems. “The data can be identified by aircraft tail number, work order, and technician, and retrieved as a PDF report for incorporation directly into customer work orders.” The testers “are built for the requirements of today’s modern maintenance shop, collecting data during testing and storing it on a secure server,” CCX said. The small tablets “replace legacy testers with a single, compact unit,” the company said. ![]() Released last year, the T-RX line, including the T-RX radio, T-RX Pulse, and T-RX RP + testers, are 10-inch touchscreen tablets and use proprietary applications to perform more than 100 different tests on “the majority of avionic radio systems,” CCX said – tests ranging from transponder frequency sensitivity to ARINC 429 label encoding and decoding among others.
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