CNN CNN Newsroom March 31, 2014 00:06:00
Voice recorder in the sully flight, the one that handed in the hudson river, which was of course exposed to water and of course was recovered with no problem, never pinged. so they dont always ping. theres a lot of reason to believe the air france 447 devices never pinged because they sent the hydro foam pretty much right over where they found it two years later and didnt hear anything. a shred of evidence, theyll put it in the water and hope they hear something. >> they dont know. they dont kno...
Source: archive.org