Ok, here is a question for all of you Engineer\'s out there... On the four engine Time, Fuel and Distance to climb charts there is a Temp Dev correction on the third page, I believe, for an all bleed on condition. The baseline is -30. Anyone have any idea why the base line is -30 instead of 0? The three engine climb charts don\'t have this correction, I assume because they assume you are bleeds closed.
Ideas?