The pilot wrote an article in the safety magazine for his colleagues how he misheard the heading for flight level clearance. Instead of turning to heading 080 ("Turn right heading zero eight zero"), he CLIMBED his aircraft to flight level 080 (as if he had understood "climb flight level zero eight zero"). Thus his aircraft came into conflict with an aircraft that was descending to FL070 and this had to be solved by ATC. In hindsight, the pilot agreed that he mistakenly took the heading for a flight level and wrote extensively about this in the safety magazine of his airline company.
Examples - how to read
Examples explained
In these sections, you will find a variety of examples that are matching the behaviour described on the home page or in the general purpose navigator. Browse through the examples to get a feel how behaviour could be classified. Notice how seemingly innocent errors can lead to major disasters. And how blatant behaviour may have benign consequences, but should definitely NOT be tolerated. Remember that intent of the behaviour is the qualifying parameter for classification.