I don't believe it is lining loss, not being an engineer but a mere driver I don't know the exact details but it has been described to us as I stated. I appreciate the possibility of a fast change but unfortunately there doesn't seem to be an engine complete or otherwise on the face of the planet. We got one "loaner", I believe from RR but it was far from complete and had to have all the ancilleries strapped on in the field on change. Also it is a non Trent core and it constantly runs 30C hotter than the rest with a potential over temp over 24C MSL. Possibly G rating is the answer but unfortunately we have some destinations that wont handle it either because of high altitude ot short runway at our normal operating weights.
I well remember in BA when the "good" engines were transferred to the 767 and the ones with low margins were hung on an inboard position on the 744!
Thanks for the info.
Flightwatch