3 ms·
Six 9s would be half a minute of downtime per year. I don't see how that is possible given the maintenance required for these planes. Even the simple A checks
by Aloisius 2y ago
Six 9s would be half a minute of downtime per year.
I don't see how that is possible given the maintenance required for these planes. Even the simple A checks ground a plane for hours every couple hundred flights while D checks take months to complete every 6-10 years.
Edit: minute not hour
- csallen 2y agoBy my math, six 9's is 30 seconds, not 30 minutes? (1 - 0.999999) * (60 * 24 * 365) EDIT: This chart agrees: https://en.wikipedia.org/wiki/High_availability#Percentage_calculation https://en.wikipedia.org/wiki/High_availability#Percentage_c...
- Aloisius 2y agoYou are correct. Forgot what my units were in bc.
- echoangle 2y agoThe six 9s are probably meant as catastrophic failure rate, not downtime.
- fnordpiglet 2y agoIt counts any event where the plane has an unplanned event including unscheduled maintenance, unplanned flight deviations, and of course catastrophic failures.
- benhurmarcel 2y ago> I don't see how that is possible given the maintenance required for these planes You normally only count unplanned downtime in those stats for aircraft.