Hmm, thanks Mutt. Re-reading the original question I think I mis-understood. Centaurus was not questioning the use of full or reduced EPR-value, but merely the difference between the N1 values at the same EPR but different OAT. So my attempt at answering was a bit gibberish'ish (if that's a word).
The N1 vs. EPR chart in our -200 QRH has a note: "Use actual OAT only", so we enter the chart using the reduced EPR from an assumed temperature, but use actual OAT.
Last edited by Guppy Driver; 12th February 2006 at 09:47.