Consider the following failure mode for a turbine:

"A technical error in the turbines, which occurs only extremely rarely (1 in 1 Million) and which has only a very remote chance of being detected, causes the engine to catch fire and the entire plane to explode eventually."

Here, the Severity (S) for this effect is equal to 10.

Using the guidance table, determine the values for O and R for this effect.

What is the RPN?

[Note: for this question, please refer to the exact ratings given guidance table.]

Severity of Effect Probability of Occurrence 10 May result in safety issue or regulatory violation without warning 101 in 2 9 May result in safety issue or regulatory violation with warning 9 1 in 10 8 Primary function is lost or seriously degraded 8 1 in 50 7 Primary function is reduced and customer is impacted 7 1 in 250 6 Secondary function is lost or seriously degraded $ Secondary function is reduced and customer is impacted 6 1 in 1,000 Loss of function or appearance such that most customers would 5 1 in 5,000 return product or stop using service 4 1 in 10,000 Loss of function or appearance that is noticed by customers but 31 in 50,000 would not result in a retum or loss of service 21 in 250,000 Loss of function or appearance that is unlikely to be noticed by 1 1 in 1 Million customers and would not result in a return or loss of service Little to no impact Likelihood of Detection 10 Absolutely uncertain that failure will be detected 9 Very remote chance that failure will be detected 8 Remote chance that failure will be detected 7 Very low chance that failure will be detected 6 Low chance that failure will be detected 5 Moderate chance that failure will be detected 4 Moderately high chance that failure will be detected 3 High chance that failure will be detected 2 Very high chance that failure will be detected 1 Almost certainty that failure will be detected