Going forward industry-wide, could another pound of weight be invested in doubling the life of the flight data recorder's pinger from 30 to 60 days?
I think I suggested doubling or tripling the underwater locator beacon battery size already in one of the AF447 threads. One Dukane ULB only weighs 7 ounces (200 grams), battery included, so the amount of added weight would not be much more than a pound or so for two slightly larger ULBs. Besides, they are located on the outside of the recorder boxes, so finding space for them might be easy.