I've flown the first 747-400 tutorial flight five times now and whenever I get to the point at the start of page 16 where I have to enter the value 509 as the zero fuel weight I get an "Invalid Entry" error on the FMC. It's driving me mad as I can't see what I'm doing wrong. I'm using the Virgin Atlantic 747-400 if that's any help and have checked, double-checked and triple checked the loadout in LoadEdit.exe. It's fine and the values all read how the manual says that they should. I've experimented and the highest value that the FMC will permit me to enter as a valid Zero Fuel Weight is 408. Needless to say, that's messing up my V Speeds amongst other things. I really have no idea what I'm doing wrong. Also, whenever I complete the engine start up (lower part of page 18) the tutorial asks that I hit RCL on the lower EICAS and check warnings. I always get the following (shown in yellow): Fuel Press Eng 2 Fuel Press Eng 3 >XFeed Config This hasn't caused any disasters on my short flights, but it's a bit worrying. Any help would be much appreciated. Thanks in advance.

Is it in lbs or kilograms?Its a while since I flew the PSS 747 - still one of the best

The tutorial uses pounds (Lb), your FS is probably set up for kilos (kg).For 509.000 lbs, put in 235.000 kg.I have a nice calculator to do the conversion for me, but dividing by 2.2 gives a good approximation.

Ah! That was it! Fantastic!Thanks, guys. Very much appreciated. :)