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View Diary: Airbus vs Boeing (118 comments)

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  •  I think it's a PTU (Power Transfer Unit) (10+ / 0-)

    In order to save gas, it's common to only start one engine until just prior to takeoff.

    I think what you're hearing is the pump that's pressurizing the one hydraulic system until that second engine is started. That's why you don't hear it all the time.

    It kind of sounds like a dog going "woof woof woof".

    If the pilot's good, see, I mean if he's reeeally sharp, he can barrel that baby in so low... oh you oughta see it sometime. It's a sight. A big plane like a '52... varrrooom! Its jet exhaust... frying chickens in the barnyard!

    by Major Kong on Sat Mar 09, 2013 at 01:11:31 PM PST

    [ Parent ]

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