From: firstname.lastname@example.org (George Hull) Organization: DirecTell L.C. - Park City, UT. - 1.801.647.0214 Date: 07 Apr 95 03:09:13 References: 1 2
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In article <airliners.1995.350@ohare.Chicago.COM>, email@example.com (FMCDave) wrote: > Fuel at destination is calculated by the FMC Performance function. It > uses the cruise altitude, wind profiles, and calculated speed (such as > ECON) to perform the integration. It uses the lateral flight plan for the > distance and if there are any discontinuities then a direct line distance > between the discontinuous parts are used. This probably happens most when > you have not entered an arrival. > > The biggest impact to the fuel at destination is the accuracy of the wind > model. Additionally, if the calculated fuel differs from the indicated amounts by a predetermined amount the pilots must choose which value is most accurate . . it might be the first indication of a leak in the fuel system. And the FMC uses a "cost index" to determine the speed to use for cruise flight. That value is supplied by the company and is a way to prioritize the relative costs of fuel and other costs such as the crew. Geo.