When a computer misinterprets altitude as a stall, the plane dives without warning
In short: In 2008, a Qantas flight cruising at 37,000 feet suddenly plunged toward the ocean. The cause was not pilot error or turbulence, but a rare software glitch that convinced the aircraft it was stalling. The resulting uncommanded maneuvers left dozens of passengers and crew with severe injuries from being thrown about.
On 7 October 2008, Qantas Flight 72 was traveling from Singapore to Perth when one of its three air data inertial reference units began feeding erroneous information to the flight computers. This unit, manufactured by Northrop Grumman, suffered a corruption that mislabeled altitude data as an extreme angle of attack. The flight control system, designed to protect the aircraft from stalling, reacted to this false data by forcing the nose down twice in rapid succession.
The Airbus A330's fly-by-wire system relied on an algorithm that could not handle multiple, rapid data spikes occurring at specific intervals. During the development of this system in 1991 and 1992, standard safety assessments and simulations failed to uncover this design limitation. Investigators concluded that the incident resulted from the combination of this software flaw and the specific failure mode of the reference unit, which likely stemmed from a marginal hardware weakness triggered by environmental factors.
The emergency landing at Learmonth Airport in Western Australia followed a chaotic scene where passengers and crew were tossed against cabin fixtures. While the aircraft was repaired and returned to service, the human cost was significant. Many suffered fractures and spinal injuries, leading to complex legal battles over compensation. The incident prompted the European Aviation Safety Agency to issue an emergency directive to address the vulnerability in A330 and A340 models, highlighting the risks inherent in complex, automated flight control systems.
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- Summary by Intellect · source: Qantas Flight 72
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