B.H. I agree in some respects to what you are saying about contaminated calc's being grey in some aspects. The policy and procedures is in the books though for all to read.
The whole purpose of this post though was not to ask technical questions about how you work out contaminated figures.
It was undoubtedly to try and show the Ryanair crew to be acting negligently in some respect unsafe. This is disgusting in my view and I hope this thread has shown the original poster to be lacking in a large amount of cont. experience and knowledge.
The RWY was checked, evidently from what we learn in this thread by airfield ops and then again by the Captain. Cont. figures must have been used in terms of weight and x-wind limits and a V1 reduction made. I would assume that cold weather supplementary procedures was used and that an engine run-up of 70% N1 for 30 sec every 30 min. At this point if the a/c was on the rwy a degree of judgment can again be used to assess the rwy condition.
A JBI meter is useless in these conditions as stated many times over. Hence why you have cont. figures in your manuals!!!
I think this is RYR bashing at its highest and an ideological problem some people have.
I have also noticed KTT has now gone very quite in this post. I think that the Ryanair crew deserve an unreserved apology from you.