supply for the pinger. so in february of next year you cannot manufacture any noncomplying power supply except it's going to be phased in over the years. the difficulty with the most recorder rules is that you are required -- it sounds dreadful when we're facing such horrible losses here but you are required to do a cost benefit. we've never had an unsolved accident with a transport airplane. this could be the first one. >> and maybe the one that changes best practices, as you say. thanks very much to kevin and steve. changes to planes and also this new satellite information. coming up on "the lead," mechanical or intentional? investigators are still working through every possible scenario. which theories are being ruled out as more details come out? plus, another tragedy closer to home. 176 still trapped in the washington landslide. ahead, i'll talk to one emergency worker who has helped rescue several residents,