"Is that one engine or two? Where do they find the second segment climb gradients for the 310?
There is NO REQUIREMENT in part 91 to make IFR climb gradients on one engine."
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OK. I'm going to try and be nice about this. Regarding the one or two enging question first: Cessna does indeed publish single engine rate of climb for the 310R. The pilots that fly N310QS will NOT take off with passengers if they do not EXCEED the required IFR climb rate on ONE ENGINE!
Again, we have a true educator on our hands with this next one. You are indeed correct that there is NO REQUIRMENT in part 91 to make IFR climb gradients on one engine. Not even on two engines for that matter oh regulation Budda. What I am trying to say is that regardless of "regulations" the people that fly this airplane fly it safe and with in all IFR worst case scenario boundries. If they can not make gradients they do not go. I know this for a fact! Yes, they want to build time but they are not stupid. They know more about aircraft performance, TERPS and the capabilities of their little airplane than anything FSI can teach you. Give the guys a break. They are safe and take pride in staying safe. Besides, I don't even know why you continue to bad mouth these guys. Per our good buddy GH noone has to see the inside of the 310 again anyway.