Air data computer
An air data computer (ADC) is an essential avionics component found in modern glass cockpits. This computer, rather than individual instruments, can determine the calibrated airspeed, Mach number, altitude, and altitude trend data from an aircraft's pitot-static system.  In some very high speed aircraft such as the Space Shuttle, equivalent airspeed is calculated instead of calibrated airspeed.
The first air data computer patented in the US was developed by John H. Andresen.
In Airbus aircraft the air data computer is combined with altitude, heading and navigation sources in a single unit known as the Air Data Inertial Reference Unit (ADIRU). This has now been replaced by Global Navigation Air Data Inertial Reference System (GNADIRS).
- Air Data Computer, Avionics News, Kim Wiolland, 2015-01
- What Is an Air Data Computer?, Wisegeek.com, Retrieved 2015-06-25
- "United States Patent 3,742,325 – Plural Input Mode Servo Driven Air Data Computer". USPTO Patent Full-Text and Image Database. United States Patent and Trademark Office. June 26, 1973.
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