For this question, use the guidance table posted above.

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 $S($Severity$),$ O $($Occurence$)$ and D $($Detectability$)$ for this effect.

What is the RPN$?$

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

$180$

$90$

$20$

$9$

$10$