I've got a question concerning the thrust reversers of the A340.
I think I read that the "newer" versions of the A340-300 only have trust reversers on engines no.2 and no.3.
This picture would support this thesis:
Photo © Simone Kuemer
A340-313X with 2 thrust reversers deployed
Photo © Rajesh Changela
"older" A340-300 with 4 thrust reversers (great shot BTW!!)
However, this "new" A340-313X also has 4 thrust reversers:
Photo © Darcy Stevens
And finally an A340 with thrust reversers deployed on engines no.3 and no.4 only!?
Photo © Matthew Lee
Could anyone please enlighten me?
Is it up to the airline customer to choose 2 or 4 thrust reversers or can each thrust reverser be deployed as the crew wishes it (like no.1 and no.4 or no.2 and no.4 etc.)?
Any help appreciated!