June 1994 crash of A330-300 during testing of new flight control software. Airbus blamed it on "pilot error" which was bought by the French investigators. The actual cause was quite interesting, hence my knowledge of the case. The A330 was configured for extreme aft center of gravity, and they were testing engine out on takeoff. The autopilot performed the programmed ascent to 2000 feet but due to errors in software prioritized altitude over speed, and speed fell to 100 knots -- below the minimum control speed of 118 knots. This resulted in the plane starting to roll, which the crew tried to recover by reducing thrust since they thought the roll was from asymmetry with the engine out (true for older flight control software versions). The nose pitched down and it flew into the ground. The error is a classic problem: how to prioritize and integrate multiple problems, that can be parallel, orthogonal, converging or diverging. In 1994 Airbus got it wrong (but fixed it quite well, with no A330 crashes for the next decade). On the A380, there is the same problem but in different form: the many ECAM messages, many of them irrelevant or even conflicting with other messages. The software has to do better to prioritize and act on the most important factors first; still it is left as an exercise for the pilots to do, often by the seat of their pants and unaided by the ops manual. And this is 15 years later, with tens of thousands of man years of effort.