Boeing 787 Battery Was Miswired, Japanese Probe Discovers

DreamlinerTOKYO -- A probe into the overheating of a lithium ion battery in an All Nippon Airways Boeing 787 found it was improperly wired, Japan's Transport Ministry said Wednesday.

The Transport Safety Board said in a report that the battery of the aircraft's auxiliary power unit was incorrectly connected to the main battery that overheated, although a protective valve would have prevented power from the APU from doing damage.

Flickering of the plane's tail and wing lights after it landed and the fact the main battery was switched off led the investigators to conclude there was an abnormal current traveling from the APU due to miswiring.

The agency said that more analysis was needed to determine what caused the main battery to overheat and emit the smoke that prompted the Jan. 16 emergency landing of the ANA domestic flight and the worldwide grounding of Boeing (BA) 787 jets. They said they are consulting Boeing about the issue.

The Federal Aviation Administration and aviation authorities in other countries grounded 787 fleets because of the ANA incident which followed a battery fire earlier in January in a 787 parked in Boston.

The 787, dubbed the Dreamliner by Boeing, is the first airliner to make extensive use of lithium ion batteries, which are lighter weight, charge faster and contain more energy than conventional batteries similar in size. However, the batteries also are more prone to overheating and catching fire.

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You all do realize of course this is all George Bush's fault

February 21 2013 at 3:19 AM Report abuse rate up rate down Reply

+ to+. - to -. Maybe unless it's a series circuit.

February 20 2013 at 7:57 PM Report abuse rate up rate down Reply

Quality Control. More inspections.

February 20 2013 at 7:06 PM Report abuse +1 rate up rate down Reply
In My Opinion Only

Boeing employees are becoming tired and need to retire, young employees have no respect for Boeing while Obama's the President.

February 20 2013 at 5:53 PM Report abuse -1 rate up rate down Reply
Dan King

Put programmed robots on job and that way only engineers have access instead of cheap labor!

February 20 2013 at 4:13 PM Report abuse +1 rate up rate down Reply

I am not a techguy so I better stay out of don't need stupid remarks.

February 20 2013 at 4:01 PM Report abuse rate up rate down Reply

I am an engineer, and would love to get my hands on this problem. Please appreciate that a miswiring in a system is very difficult to identify until something goes wrong. I am aware of LI battery limitations, and have read that Airbus has been replacing their LI's with NiCads. That speaks volumes.

February 20 2013 at 2:51 PM Report abuse +2 rate up rate down Reply

Don't blame the Japanese for this. Blame the line employees who wired it, blame the inspectors who passed it as ok, right here in the USA. I don't care if they were union or not. Somebodies are asleep on the job.

February 20 2013 at 2:32 PM Report abuse +1 rate up rate down Reply
1 reply to jhrooney's comment

Um, it was a Japanese airline in both cases, and they both do their maintenance in Japan, unless it is an emergency. The wiring has about a 95% probability that it was done by a Japanese mechanic in a hanger in Japan. Both ANA and JA have done massive battery replacement programs in the last several months, adding to the strong likelihood that it was the Japanese who messed up the wiring.

February 20 2013 at 6:25 PM Report abuse +1 rate up rate down Reply

Let me guess this is Obama's fault also. pathetic!

February 20 2013 at 2:25 PM Report abuse rate up rate down Reply
1 reply to kafienkarl's comment

No so, kafienkari, it's the Republicians fault. They can't keep blaming things on Bush anymore!!!

February 20 2013 at 2:46 PM Report abuse rate up rate down Reply

sounds like a nipon brain fart to me...a battery has only 2 terminals...and these guys are at the top of the mountain when it comes to anything electrical right?? sounds like too muck saki going around LOL

February 20 2013 at 2:02 PM Report abuse rate up rate down Reply