12.2 Safety requirements
In the introduction to this chapter, I described an air accident at Warsaw Airport where the braking system on an Airbus failed. The inquiry into this accident showed that the braking system software had operated according to its specification. There were no errors in the program. However, the software specification was incomplete and had not taken into account a rare situation, which arose in this case. The software worked, but the system failed.
This episode illustrates that system safety does not just depend on good engineering. It requires attention to detail when the system requirements are derived and the inclusion of special software requirements that are geared to ensuring the safety of a system. Safety requirements ...
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