Flight 370: No pings for days, what now?

NEED TO KNOW
  • Engineering expert: Batteries on black boxes are likely weak or already depleted
  • Officials expanded search area Sunday, looking for signs of missing flight
Flight 370: No pings for days, what now?

Ocean expert: If Flight 370 is found, new troubles await

Ocean expert: If Flight 370 is found, new troubles await

Lawyer: Flight 370 families deserve compensation

Lawyer: Flight 370 families deserve compensation

It has now been five days since the last ping, possibly from Malaysia Airlines Flight 370, was heard.

Crews expanded the search area Sunday, looking for any possible signs of the missing flight. Searchers believe the four pings they heard last week likely came from the so-called black boxes, but they need to find solid evidence.

Watch: Australian PM 'confident' pings are from Flight 370

“They’re being very cautious. They don’t want to come out and say this is definitely the black box until they have a photograph of wreckage at the bottom of the ocean,” said Tom Ballantyne, chief correspondent of Orient Aviation.  “That’s what they want. They want eyes on before they make a definite statement."

Watch: The tools behind the high-tech search for Flight 370

Time is of the essence as the search for Flight 370 has taken longer than 30 days -- the life expectancy of the batteries used to send out signals from the black boxes.

Watch: An hour-by-hour timeline of Flight 370

“More than likely, they are reaching end of life or already have. We’re at Day 37. … If (a beacon) is still going, it is very, very quiet at this point,” Jeff Densmore, director of engineering for Dukane Seacom, told CNN’s Candy Crowley.

Flight 370 vanished March 8 with 239 people aboard en route from Kuala Lumpur to Beijing. Officials said, based on data analysis, the flight “ended" in the Indian Ocean.

CNN Wires contributed to this report.

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Lawyer: Flight 370 families deserve compensation
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