no longer able to reach the satellite. >> could the emergency locator transmitters attached to the fuselage probably would have been inaccessible to anyone on board. it could have been tampered with, wolf. >> this whole issue with four signals that were supposed to come from the transmitters and none of them worked, it's really become a source of a major concern for the families of those on board. >> it sure has. recently the families submitted a list of 26 questions to malaysian officials about a whole range of things regarding the investigation. 12 of those questions delved into that issue. >> brian, thanks very much. let's discuss what we heard from brian. once again joining us, cnn aviation analyst, peter goelz