Luftfahrt Club Braunschweig Forum

On Jul 18th 2013 the AAIB reported in their special bulletin with respect to ET-AOP, that fire fighters encountered a fire above the ceiling panels close to the rear of the cabin, a halon extinguisher was not effective, only after a panel was moved and the fire was doused with water and foam the fire was extinguished. The origin of the fire coincided with the emergency locator transmitter (ELT), with no other systems in the vicinity storing sufficient energy to initiate a fire. The ELT is powered by a set of Lithium Manganese Dioxide Batteries, which showed disruptions of cells. It is unclear however whether the combustion started as result of energy release within the battery cells or by an outside event like a short circuit. Some 6000 units of this transmitter have been produced, ET-AOP is the only such incident so far. The AAIB recommended to the FAA to "inert" (deactivate) the ELTs in Boeing 787s until appropriate airworthiness actions can be taken and to conduct a safety review of all Lithium battery powered ELTs on all aircraft types.