The "black boxes" from an EgyptAir jet that crashed in the Mediterranean Sea last month are expected to stop emitting signals on June 24, investigators said.
The cockpit voice recorder (CVR) and flight data recorder (FDR) likely hold vital information about what caused Flight MS804 to crash on May 19, killing all 66 people on board, NBC News reported.
The task of recovering the devices from the sea floor would be much harder without the battery-powered "pings" indicating their location. Egyptian investigators are also working with the U.S. National Transportation Safety Board because the Airbus' engines were built by a consortium that includes Connecticut-based Pratt & Whitney.
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On Monday the NTSB said it received Egyptian military radar images confirming that the aircraft deviated from its planned course and turned a full circle before disappearing on route from Paris to Cairo.