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A Pratt and Whitney engineer once told me that EPR is better because a 1% error in EPR indication is a 1% error in thrust. Using N1, a 1% error in rotational speed could be as much as a 4% error in thrust depending on actual engine speed. The Potomac crash was not caused by faulty EPR, but a whole host of other problems which caused, among other things, incorrect power being set.
GF
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