January 28, 20188 yr Hi, I was wondering what the usual, and optimal/expected duct pressure should be before an engine start in the B737NG. I've read somewhere that the minimum required is 30psi, which seems to be the case during a crossbleed start, however, every time I start my engines (the normal way, without ground air, or x-bleed), I tend to get around 18psi. Now, this is fully function and I'm always able to start. But hence my question, is it supposed to be that low? And in that case, why does it seems like it is expected to achieve 30psi duct pressure? Thanks in advance! Marcus Haraldsson
January 28, 20188 yr IIRC the 30psi refers to older aircraft. The APU on the NG is demand driven and ramps up the air supply only when there is a demand for it, so the duct pressure does not rise off load. Found this: https://www.pprune.org/tech-log/154000-b737ng-minimum-start-pressure.html
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