2500
I mentioned this accident in my first posting. It led to the introduction of Flight Engineers into the crew. The basics were that 'Murphy's Law' was in operation on a non-return valve in one of the fuel lines and caused an engine failure. The crew mis-identified the failed engine and shut down the second one on the same side. The reason for the mis-ident was considered to be down to lack of torque meters and these were subsequently introduced as a 'mod' together with FEs to monitor them. The aircraft crashed into the dog pound at Abingdon, killing all on board - crew plus paratroops (I believe).