Originally Posted by lomapaseo
99.99966% free of defects I have no idea to what this applies
Congratulations ! Never use a number without to know exactly which reality it covers. specially when it is probality or statistics.
PJ2 gave us unvolontary an opportunity to show that. When he used the number 99.9% it was a synonymous of high safety in his mind
, as it is in horoscope or lottery, and tried to sell us some sterilized speech. In the cockpit, it would have his place, but we are here on the ground, all together, to get a little smarter with higher air safety, after AF447
I immediatly choosed to show what was wrong, and applied 99.9% to flight time, as he was in the defender's position, and the result was 67 hours safe vs 4 min crash, which is very unsafe.
Originally Posted by john_tullamarine
The gold standard is Six-Sigma - 99.99966% free of defects
Continuing this way, with 99.99966% free of defects, it means 3.4 / 1 000 000 defects.
For 4 minutes crash, you have 19 608 hours safe (in his whole life, PJ2 has flown around 20 000 hours)
For 1 minute crash, 4 902 hours are safe...