Returned from Narita a few years back (A340). While taxiing out we overran just about every taxiway light between the apron and the threshold creating a thud, thud, thud through the airframe. During the take off roll the RAT unlocked message came up on the ECAM followed by full deployment in the climb. 11 hours later we arrived back at LHR with the RAT having spun at about 6000rpm all the way. The bearings must have been shagged!
regards
wizzy