"Capt. Geoffrey Thorpe" The Sea Hawk at wow way d0t com wrote in message
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"karl gruber" wrote in message
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What is B-10, B50 etc?


Karl
Always top post


B-10, B-50... are the expected hours at which 10%, 50%, etc. are expected
to fail. The "B" is from "bearing" - the orignal theorys were developed
to predict the life of ball bearings, but the termanology is now used for
everything. The Weibull distribution is usually used to "fit" durability
data and determine these values.

If TBO is B-10, then, in most cases, it would seem silly to overhaul at
TBO, if it is B-90, then it would be optimistic to expect to make TBO...

Or, TBO could be a number that some engineer pulled out of the air (to put
it politely).


I don't think TBO is a projected or average expected "point of failure". I
believe they'd call that "Expect Life Expectancy".