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B757 cruise phase

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I know that the 757's thrust settings are expressed as EPR values. But what are the N1 readings in the cruise phase at Mach 0.80 ? The PSS model gives a N1 reading of between 77% and 80%. What are real world values? I thought the N1 readings were between 83% and 87%. Is anyone able to shed any light on this?ThanksTrevor

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