Like in business. I know that half of advertising expense is wasted; I just don't know which half?
........I would contend that at least 6 configuration-related accidents over a 30 year period (OK, maybe not justified in my earlier statement as "Not infrequent") IS a significant statistic, then please further elucidate? What should be done, in your opinion, to better, or more relevantly, address the issue of the three killers?
we can start with your above statistic. Now consider how many aborts occurred because of misconfigurations annunciated by warnings (horns or lights, etc.) That provides both a crew error rate as well as a safety barrier success rate. (note I'm ignoring checklist caught misconfigurations)
And of interest to me, how many aural warnings or lights failed to warn?
if it's 1 out of 20 or worse than that is way too much and should be addressed as the highest priority.
If on the other hand the crew missed not only the configuration but also the warning light or horn then we have the wrong crews flying planes.
the above is still hypothetical relating to the accident in this thread