Have not seen this asked: There is supposed to be an emergency transmitter that automatically begins to ping upon impact. I believe it transmits to satellite if it’s on the surface.
If it sank, can the pings be picked up by sonar? Does the sonar array have to be on a ship or can they drop a buoy?
Our submarines and sonar buoys can hear a mouse fart for miles, point it’s location and tell you what it had to eat.
It’s been asked. The main transmitter can be turned off by the pilot and often is when a hard landing is anticipated, so it doesn’t go off on a normal landing.
The other ones have to be manually turned on by the flight crew when a water landing is anticipated.
So neither of these are likely to be pinging since the flight crew was probably incapacitated and the pilot or copilot would have turned of the main transmitter.
This is all according to one of the “experts” on Fox who has usually made sense when he’s asked a question, answering primarily technical questions.