Black box

The news that a pinger locator has detected signals consistent with transmissions from an aircraft black box is “very encouraging” but the mystery of missing Flight MH370 remains far from being solved, an aviation expert said Monday.

“It’s taken everybody by surprise that they have managed to find a ping,” Adrian Gjertsen, of U.K.-based Airsupport Aviation Services Limited, told NBC News “It’s very encouraging but even if it is from the plane, it will be extremely difficult to recover from the ocean.”

While the black box is a useful tool it is not like a video recorder and it only provides raw data that allows investigators to build a scenario of what might have happened, he added.

"The cockpit voice recorder is unlikely to be of any use," Gjertsen said. "They are recorded on a continuous loop so after around two hours it will have recorded over what was on there earlier. So it’s of less interest, because the period that is of most importance is when it lost communication up to seven or so hours earlier."

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