Whatever calculations you make, they can only be based on factors you can think of that have a significant impact in the process.
It takes only a flock of birds or a uncontained engine failure with the pieces all over the place to have significant damage on both engines.
Fly the B 777 or any twin for that matter into some african destinations and you will see that the nine number figure does not stand up anymore.
Good Luck
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Smooth Trimmer
[This message has been edited by Streamline (edited 05 January 2001).]
[This message has been edited by Streamline (edited 05 January 2001).]