Why Do Airplanes Crash?
Investigating Air Data Systems


Over the past four decades, hundreds of passengers have died as a result of failures in the
guidance, navigation, and control systems of commercial aircraft. Often, the failures are in the a
fault-tolerant sensor system called the Air Data Inertial Reference Unit (ADIRU). The ADIRU
captures data from airspeed sensors, gyros, GPS, barometers (for altitude), and other sensors.
Indeed, the 2009 Air France Flight 447 crash in which 228 people died is blamed in part on
ADIRU failures

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Galois, Inc. An R&D company in downtown Portland.