there is a slow succession of tiny incremental deviations from what previously was the ‘norm [......] ’continually realign themselves and their operations with current interpretations of the balance between profitability and risk
Excellent reminder
safetypee . A similar sentence was also in Perrow's " normal accidents " book if I remember.
We have a saying in French (from Alphonse Allais) that can translate as when you voluntarily exceed the rules/borders , there are no limits anymore on what you can do .. (
une fois passe les bornes il n'y a plus de limites) Those 2 sentences resume well the SFO self separation procedure only aimed to allow more movements in an Airport which runways configuration, according to the rules, would not allow simultaneous approaches.