A/c slave. .Thanks for the gen regarding the bearing.. .. .I thought it was something like that. There sure was a lot vibration evident in the cabin, followed by a lot of white smoke out of the jet pipe on shut down, not sure if there was any fire though. . .. .Thumbs up to the flight attendant on the p.a. who was determined to carry on flogging off the train tickets and telecom cards above the din of the number 2 engine trying to vibrate itself to peices!!. .. .Thumbs down to Stansted security who would not let pax out of baggage hall (after waiting a couple of hours) into terminal for large brandies, scotches etc.