On an Airbus 380, the toilet is a safety critical system


Airbus A380
Airbus A380 (Photo credit: Wikipedia)

As pointed out at the University of York’s real time systems group meeting yesterday…

The Airbus A380 is the world’s largest passenger airline and it flies long distances. As such its human waste management systems have to handle a large volume of material.

Of course the material that ends up in the system was on the plane from the moment in took off but at the moment of takeoff the weight is distributed throughout the plane while the longer the flight continues the more of that weight gets concentrated in the waste management system.

More than that – the plane is getting lighter all the time – because it is burning fuel – so not only does the weight get shifted to a more confined region of the plane, it is relatively more important.

Hence the software on the A380 that manages the toilets is a safety critical system – and has to meet some quite exacting standards.

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Human error and computer error


Flight path of Air France Flight 447 on 31 May...
Image via Wikipedia

Computer errors are almost always human errors – badly written software. The arguable exception would be the rare (?) cases where cosmic rays or other natural radiation caused a bit to flip.

But computer errors are generally seen as something which arises out of some spirit of the machine – see 2001 for perhaps the most famous and much copied example.

But as this chilling account of the crash of Air France flight 447 in June 2009, shows, humans and not machines are the real dangers.