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Guest SwissMD11

747 Fuel Issue

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Hey Guys,I fave a problem with the fuel on the PMDG 747. For Example : I had started my flight from LHR-MRU with 32.5 (according to the FMC) of fuel remaining at MRU. That time the optimum altitude shown by the FMC was FL298 so I set my cruising altitude to FL290 and using ICAO rules, I step climbed to FL330 when the FMC told me I was ready. The EFOB at MRU increased a little. And some time after that, my EFOB at MRU started decreasing very slowly. I thought that it would be no problem so I left the PC and when I came back , it showed that the EFOB at MRU would be 9.9 ?? SO, I tried some things like descending to the optimum altitude and reducing the speed to Mach .80. They helped for a while but the EFOB started decreasing again slowly. I don't know why this happening ?? I have the latest SP installed.BTW, my Cost Index was 50.

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Did you have wind data programmed in to the FMC? If you didn't then it would have calculated the wind initially on the wind you had at the time. As the flight progressed the wind would have changed which would have meant the FMC would have recalculated the fuel remaining, hence the changes. From what you have said this seems like the situation you may be having. Tom P

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