Cargo is not really my thing, but in my mind wouldnt it be a lot more practical /cheaper/effective to make sure that potentially combustible cargo is not loaded on the aircraft in the first place? I appreciate that there is a calculated risk with everything, but the possibility of such an occurance happening again could be minimised by all the operators without the complex and expensive process of installing on board fire suppresants, which seem to have limited effectiveness anyway. Seems to me what is needed here is not technology, but discipline to do the right thing before the aircraft even moves off the gate. Siiiiimples.....?