Thanks Da4orce, I realise now what was being asked, but only those that currently work on the fleet can answer to that depth of detail, I can only assume from what was written in the text you posted, and I mearly copied and pasted from the source text you posted at #663, that if the implementation plan had been produced early that the duct replacement programme would already be in progress, though this does not appear to be the case. I can only assume again that it is possible that they are waiting for the BOI findings before deciding where to spend/not spend money, your last paragraph is probably closer to the mark.
It is difficult not to sound like a 'man from the MOD' as DV put it, but I am out of the RAF, allthough I still work within the military environment I am no longer close enough to give up to date in depth knowledge of what is happening in the Nimrod fleet today. Most of my responses have been to try and answer the technical systems info that TD and others have asked, and this is from memory of my days within the Nimrod groundcrew world and from the recent platforms that I have fuel system knowledge of, additionally some comments are my own personnel opinions on what is happening and on responses from other posters. If this means that my inputs are not valid or relevant then I will consider waiting for any official outputs on the findings before posting again.