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Ricardo41

COG/Trim Settings Via FMC - Are These Reliable?

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I was wondering about the accuracy of the takeoff trim settings recommended via the FMC. I tried to do it by the book, but found that at Vr the plane would not lift off, suggesting that the trim I set wasn't the correct one.any suggestions? something I overlooked?ricardo

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Ricardo, I use 5.2 all the time and it lifts off right on the money. I am not sure if the trim settings in the FMC have been modeled.Bob

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Bob, I think you're absolutely right: 5.2 is right on the money, independent it seems of your TOW or COG. Seems weird. If you select any other value, the plane won't rotate at Vr.ricardo

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Well it would help if you gave1] Your *TOW*2] Your VSPDS for this weight3] Your trim setting [h4]Randy J. Smith[/h4]

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