Mooneymite Posted January 12, 2017 Report Share Posted January 12, 2017 (edited) On Tuesday, January 10, 2017 at 9:19 PM, cliffy said: The Wash DC 737 had the engine antiice turned off and the pressure tubes on the front of the engines iced over giving a false reading on the EPR (exhaust gas pressure) ratio gauge in the cockpit showing way more thrust than they actually had. I know Cliffy just mis-typed, but EPR is Engine Pressure Ratio. EPR is (simplified) pressure at the tailpipe compared to pressure at the inlet. These used to be used on a lot of jets because they measure thrust, but because of their propensity to give false readings, they have fallen from popularity and most of the time power is set with reference to N1 RPM now. There are exceptions, though. Edited January 12, 2017 by Mooneymite Quote Link to comment Share on other sites More sharing options...
cliffy Posted January 12, 2017 Report Share Posted January 12, 2017 Yup just a typo. EPR was used mostly in earlier jets like 727, early 737 etc. as the primary thrust setting instrument. Many pilots that I taught got into the habit of not even looking at the other gauges once EPR was set. The FL accident woke a lot of them up. 2 Quote Link to comment Share on other sites More sharing options...
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