Sorry for asking but what FS version are you using? could it be FS2004?

Make sure you have "display indicated airspeed" and all realism settings maxed out.Tero

FS2002 and indicated was on...Regards,Alexander Martin.http://img33.photobucket.com/albums/v99/wa.../alexbanner.jpg

HiDid you get it sorted ?Tero

I think so.I think Weather Center was corrupt, reinstalled now it's fine.Regards,Alexander Martin.http://img33.photobucket.com/albums/v99/wa.../alexbanner.jpg

Tero-A stupid question, but, how are you supposed to get these ZFWs entered into the FMC? It only allows 245. Am I just supposed to manually calculate the gross weight using the fuel and the ZFW you tell us to use?Sorry if this is a very obvious question that was already asked. I didn't see it in the rest of this thread.Thanks, Mike Catalfamo

Goto the FMC's PERF INIT page and yes, you can change the entry for your ZFW at anytime - either on the ground or airborne. The FMC will then automatically calculate gross weight but for the 757 FDE settings it will be erroneous - this is okay. Tero's technique centers around using the 757 performance tables he mentions and then manually adjusting the ZFW until the Approach page on the FMC displays the correct Vref (flaps 30) approach speed (I. E. the same Vref as displayed on the 757 performance tables). The gross weight the FMC displays is irrelevant in terms of the 757's actual performance for the purpose of using the new FDE, don't worry about it or use it as a reference. When you manually adjust your ZFW to correctly match Vref for your aircraft's actual 757 FDE weight, you will have the correct flaps schedule by pressing the hidden airspeed bug switch on the analog ASI.Using this technique one must manually enter speeds for V1, V2 an Vr. This is done by referencing the tables and using speeds based on the 757 FDE for a fixed 175,000lbs ZFW plus the weight of your fuel load. Again, the FMC will not display the actual correct gross weight of your aircraft but what you're after is the correct Vref display for 175,000lbs ZFW plus the weight of your fuel.

When I enter a diffirent weight than 245, it says invalid entry. WHat do I do about this?

What ZF weights are you entering when you get the invalid entry error? 243,000 to 255,000 lbs for ZFW will yield correct Vrefs for a moderately loaded 757 with this FDE (i.e, wings tanks full, center tank empty), the configuration I most often fly.

Ok, that works. But arent I supposed to use 175 for the FDE?

The goal is to enter an arbitrary ZFW in order to 'fool' the FMC into thinking you are flying a 767-300ER with 757-200 performance characteristics :) In this way you will get accurate flap schedule and Vref settings for a 757 instead of the 767 that PIC was originally programmed for. Use the 175,000lbs ZFW to reference the tables and get your Vref, V1, Vr, V2 speeds. You would add your fuel weight to the 175,000lb ZFW to get your gross takeoff weight. Once you know how much you now weigh for takeoff, look up the correct V speeds for this weight (175,000lbs ZFW + fuel load weight) in the tables that Tero mentions. Find an arbitrary ZFW (by trial and error) that will give you the Vref in the approach init page of the FMC that is equal to the one listed in the 757 tables for your takeoff weight. Remember, you are doing this to fool the FMC in order to get the correct 757 flap schedule. The only thing you will use your actual takeoff weight for is to look up the information in the tables. The ZFW/gross weight programmed into the PIC FMS will be erroneous so don't worry about it. You are fooling the FMS into thinking the 767 it was made for is going to fly like a 757 instead :)

OK.Everybody is talking about the Vref and the flaps and it has been helpfull now what about the CRUISE PAGE ..OPT and MAX altitudes.If we are to use a certain weight for TO/LAND to get correct Vref is the cruise page also correct when it comes to the OPT/MAX altitude or do we need a another weight setting.ThanksNebojsa

Mike,Check out Rugerdog's replies below. He pretty much covers the if's and why's of the ZFW issue. And of course inside the actual V3 FDE ZIP there's the readme.txt which covers the same things. Just read those and you will be fine.Tero

Rugerdog,Thanks for helping out others here. Nice to see that someone has grasped the confusing ZFW issues of this FDE/PIC767 merge so well :).Tero

Nebojsa,I'm afraid we did not test it for the FMC OPT/MAX alts. I suspect the alts will still be pretty close, as you are flying the bird with correct relative (compared to 767) ZFW numbers (in the FMC) to fool the FMC. The 767 is a bit faster in all comparable weights, so the FMC readouts will probably show too high alts. That said, you will need to check the performance tables for exact figures.Tero