The photo below of an A340-300 appears in an article on EK in last week's Aviation Week magazine.
I'm just curious if anyone can speculate why the thrust reversers are deployed on the inboard engines only. Are they designed to deploy sequentially, first on the inboard and then on the outboard? In that case perhaps the outboard reversers just haven't opened yet since the aircraft has obviously only just touched down.
Or would there be a reason why they would intentionally only deploy the inboard reversers?
P.S. Just before I was ready to post the above I spotted the following thread from 3 years ago, so I think my question is answered. It sounds like the outboard reversers on the 343 don't deploy until the nosegear touches down.