But there has been talk that the Ethiopean plane is different to the standard layout in this area, i.e. the crew compartment is not fitted. This may have changed the way the ELT is mounted/contained in this aircraft. Is it now more enclosed than in other 787's, thus reducing the movement of free air around the ELT? Was any insulation omitted due the absence of the crew compartment, thus reducing or removing any protection the ELT might have normally had?