Our aircraft have two ELTs one situated in flight deck as a portable unit ,the other above the ceiling panels (just forward of the fin),the ELT is attached to the airframe, for locating the aircraft if lost etc.This unit would be almost impossible to locate in flight let alone realise the unit was on fire and take appropriate actions.Its hard enough to get to when doing a simple 'ping' test for maintenance purposes.One things for sure the 'silence is deafening'from Boeings
PR department.