For those thinking about the N/S FMC input error. Think also that the track solution based on handshake range is valid both north and south. With no other data the solutions in both directions are equally valid and at yesterdays press brief it was said that both routes are being investigated.
N/S FMC error is not very likely for a number of reasons.
Not likely? You're right there.
But mistakes get made all the time. I'm sure all of us have had a
moment at least
once in our lives. If you read accident reports, there are plenty of instances where you're left scratching your head.
It's not a hypothesis that can be discarded out of hand. Could also be a crew under duress that did it deliberately to avoid the aircraft being used for nefarious purposes. Truth is, none of us know yet -- it's all hypotheses, theories and speculation now.