In other words, feeding the PSX weather into TOPCAT, with the same derate, and same runway, calculating N1 for takeoff might give 102.3% in TOPCAT, whereas the FMC commands 104.1%.
I note that the N1 predictions for the GE engines are off by a percent or two when compared to the N1 commanded by the FMC. But just in case you or someone else does. My second question has to do with TOPCAT and I understand that you may not have any idea here. So my question is this: given what you know about PFPX, should I expect that the fuel burn would be as predicted under ideal circumstances? Or are there any known issues with fuel predictions in the final phase of the flight? Could be any number of factors here - weather, primarily, or unpredicted time spent at intermediate altitudes, the speed schedule in the descent, etc. However, in each case, the approach (starting at TOD and going until landing) took about 6000 more lbs of fuel than predicted by PFPX. I'm using the latest version of your 747-400 passenger GE performance file for PFPX, and the agreement was really excellent throughout the whole cruise portion. Normally I can't finish a full 15-hour flight but I was able to do this a time or two in the last few weeks, and I noticed that PSX and PFPX were basically in full agreement about the fuel consumption enroute. These controls vary by browser, and manufacturers may change both the settings they make available and how they work at any time.Steve, I have two quick questions for you.įirst, I had the pleasure of flying some full long-haul flights in PSX recently. In addition, your browser or device may offer settings that allow you to choose whether browser cookies are set and to delete them. To learn more about the choices that advertisers provide generally for individuals to influence how information about their online activities over time and across third-party Web sites or online services is collected and used, visit the Network Advertising Initiative, the Digital Advertising Alliance, or the European Digital Advertising Alliance. Please note that if you set your browser to disable cookies or other technologies, you may not be able to access certain parts of our Service and other parts of our Service may not work properly. Other ways you can control your informationįollow the instructions provided by your browser (usually located within the "Help", "Tools" or "Edit" facility) to modify your cookie settings. Without cookies you will not be able to log in to your account, manage or buy subscriptions or access any data or content that is not plain text or images. Accept cookies that come from our third party partners, which are used to optimize our services by producing analytics, personalizing content (including ads), measuring ads, and providing a safer experience? If you don't want cookies at all
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