The U.S. Navy has picked up signals from the flight data recorders of an Indonesian jetliner that crashed into the...

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JAKARTA, Indonesia — The U.S. Navy has picked up signals from the flight data recorders of an Indonesian jetliner that crashed into the sea with 102 people aboard, including three from Oregon.

The USNS Mary Sears located signals “on the same frequency of the black boxes associated with the missing airplane,” a statement issued by the U.S. Embassy in Jakarta said.

Data from the flight recorders will be crucial in determining the cause of the crash, but retrieving them from the ocean floor at a depth of more than a mile will likely be a difficult, expensive and lengthy operation.

The Adam Air Boeing 737 went missing on New Year’s Day after reporting heavy winds off the western coast of Sulawesi while on flying from Indonesia’s main island of Java.

Aboard were Scott Jackson and his two daughters, Stephanie, 21, and Lindsey, 18, students at the University of Oregon. Scott Jackson, 54, worked for a wood-products company and lived part time in Indonesia.

Search teams have since found almost 200 pieces of debris — mostly small pieces of the wings, tail, cockpit and cabin — but no bodies.

The embassy did not say when the signals were picked up or where on the ocean floor off Sulawesi they were coming from.

The hull of the aircraft has not yet been recovered, but the statement said the ship “detected heavy debris scattered over a wide area” close to where the signals were coming from.

The devices on commercial jetliners record crucial flight data such as a plane’s speed and altitude as well the voices of the pilots.

The U.S. embassy said that “having completed its mission,” the Mary Sears, a Navy oceanographic survey ship, would depart Indonesian waters.