B747-400 FMS problem/explanation!!!

[ehasanov1 1]

HiI installed update 1.2 and now I have a question about FMS/MCDU.Is it normal that after I press EXEC on MCDU, screen goes black (screen of MCDU) and after few seconds return to normal condition?.I see route (magenta) on ND, so command is executed.ThanksEdin

[Chaos81 110]

Yes. It's always done that to my knowledge.Don't worry, the real thing does that too. I'm guessing it has something to do with processing power, or lack thereof.

[ehasanov1 1]

Thanks Mike.I'm engineer on Airbus and ATR42 a/c, and this is not a case on real Airbus MCDU so I was a little surprised :-)How ever, thanks on your quick replyEdin

[Tabs 2,790]

Yeah the CPU used in the older Boeing FMCs are slooooow. We're simulating the processing delay caused by that.

[Qavion 19]

...and sometimes it's so slow, you get a warning message in the scratchpad telling you it's still computing :("STANDBY ONE" tells you that the FMC requires more than 4 seconds to display the data.Cheers.Q> イアン

[downscc 1,327]

I've always wondered why ATC says "STANDBY ONE" when they really mean "wait until I'm ready to deal with you," which might be in two or three whatevers?

[shortspecialbus 13]

No, they just mean one. One unit of "until we're ready."-stefan