It is to be hoped that in the near future the authorities will clearly identify the source of the problem and corrective measures so they can minimize the likelihood of future incidents.
A couple questions.
* Is there a significant premium paid for OP free oils?
* Is the oil usage per flight great enough that the premium will make that much of a difference in operating costs?
I know that this could be a difficult question as the economics of running an airline are getting a bit more gloomy, at least in the near term, but flight crew's health should be a prime consideration.
Unfortunately, it doesn't seem that there is a cure and/or effective treatment for the illness yet, and it will be harder to come by if there isn't a direct "smoking gun" so to speak. Nevertheless, it is still difficult to see flight crew losing their livelihood over events they had no control over, regardless of the ultimate cause.
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Modified 747 @ Dunsfold is here (re: dd and bb)
http://www.aerospaceweb.org/question/planes/q0297.shtml