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Dean_EGTC

Fuel burn query

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Currently at FL370 with a GW of 198t. Engines are showing 6.9t FF. Does a 777-200LR really use nearly 14 tons of fuel every hour? Seems an awful lot but then again it is a big aircraft.

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Dean,You're seeing "kilopounds" - in your case approx. 6900 lbs/hour per engine. I'm getting an average of 13.400 lbs/hour total, using a Cost Index of 0, based on approximately 45 hours of flight so far in the 777-200LR.

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Kilopounds??I use Metric settings with altitude in feet as I do for all other aircraft. If I see 6.9 FF per engine then that should equate to 6,900kg or 6.9 metric tons.

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Dean,Good point, I use the same settings as you... If I look at the fuel totalizer it is indeed expressed in tonnes on my system, whereas the fuel flow is clearly expressed in lbs/hr x 1000 (hence my expression "kilopounds" ;-))Now, the question is - and this one's for PSS - is this by design or a small thing that slipped through?Looking at the illustrations in the manual, it clearly says "Kgs x1000" for the EICAS total fuel indication and on the MFD FUEL page Total Fuel indicator has a similar label. The explanatory text for the individual tank figues on the same page, however, says "Displays tank fuel quantity in selected weight x1000". And as we know, the ENG page of the MFD just says "Engine fuel flow per hour x1000".I'm nowhere near my simming PC, so I can't experiment with settings at the moment, but I'll try later.

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Just a quick follow-up after further testing. As suspected, both EICAS and the MFD FUEL page correctly reflect the selected international settings - it's just the MFD ENG page that shows the FF in lbs/hr x 1000 regardless of the above settings.

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