Rotor brake?
I've read the initial CAA stuff. It appears that a serviceable helicopter with its rotors stopped crashed onto a pub roof.
I know what happens if the transmission fails (catastrophic in most cases). Engine problems seem ruled out by the initial report (as does fuel starvation) and by the knowledge that pilots train for exactly that.
I'm therefore left with one thing that could conceivably cause the accident as described, and that is the rotor brake. I'm not familiar with the EC135 rotor brake, so I don't know what conditions could cause (or for that matter prevent) rotor brake operation in flight However, On the current evidence (not the tabloid fluff but the CAA) I'm left with a possibility that fits the known circumstances.
Any thoughts out there?