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NTSB hasn't found cause of Dreamliner's battery problem

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    Dan Springer reports from Seattle

  • Duration 2:33
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I -- -- details from federal safety officials investigating battery -- downs -- Boeing 787 dreamliner some serious problems that sparked a fire.

In a plane in Boston last month and force an emergency landing in Japan.

And eventually convinced regulators worldwide to ground the fleet Dan Springer is live in Seattle with more on all of that stand.

Gadget of the bottom line is the -- NTSB is one want in the investigation into what sparked a fire on board of 77 that was part of Boston's Logan Airport they still don't know the cause.

Investigators have made some progress as they run a number of tests on the battery that caught fire that concluded.

That a short circuit in a single -- the eight cell battery led to the overheating.

At so called thermal runaway is not supposed to happen.

Damage in a single cell is supposed to be contained right there in this case -- spread of the whole battery.

The NTSB criticized -- and the FAA for problems in the batteries certification process.

There's been a lot of talk that the FDA trusted Boeing's engineers too much.

Boeing had concluded that thermal runaway in the lithium ion battery would likely happen less than once in ten million flight hours.

So for the -- letters -- flown less than a 100000 hours and it's happened twice.

This investigation has demonstrated.

That a short circuit.

In a single cell.

Can propagate.

To adjacent cells and result in smoke and fire.

The assumptions used to certify the battery.

Must be reconsidered.

Meantime -- Paine field and never Washington Boeing is awaiting the arrival of the first 787 allowed to fly since the grounding January 16.

It's just the Boeing -- -- passengers on board as being called a ferry flight the plane.

Was in Fort Worth, Texas when the fleet was grounded it was there for paint job.

As expected to land back here but 1030 local time.

All -- not officially a test flight -- will take the opportunity to monitor the whole electrical system.

It's offered the FA some fixes that would allow the whole fleet back in the air again among the things of Boeing is looking at is reducing vibration on the batteries.

And a better ventilated relations system in the battery compartments.

The ground he is getting very expensive Japan airlines which has seventeen of these dreamliner -- Says so far it's cost them seven point five million dollars and of course they want -- to pay and the other airlines that have planes are also losing money and they're all -- what Boeing.

For reimbursement gentleman asked for airline in Seattle -- thank you.

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