I was'nt working at the time of the incident but i was told that it was infact a 742 operated by the saudi's which usually comes in and parks over the North Side of the airport near the inflight jet centre.
I thought at first it may have been a FX MD-11 as they seem to like landing as hard as they can!
Infact one the other day hit so hard he bounced back into the air a good 3 or 4 feet then hit again with just as much smoke as the first time!!
They must go through some tyres!
Matt.