Didn't the crew enter the wrong weight?
Therefore any FMC generated speeds would have been incorrect also.
Rubbish in rubbish out as they say.
It needs a weight and balance system like the 747Fs* that way the FMC can tell you what it thinks as opposed to you giving it information.
* With the W&B option installed.
Last edited by SMOC; 14th Dec 2012 at 10:00.