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Japan probe finds miswiring of Boeing 787 battery on ANA flight
TOKYO - 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. (www.startribune.com) Más...Sort type: [Top] [Newest]
An overlooked issue is, even if causation and a fix is found, what authority is willing to approve it? Talk about high profile..
Hardly "overlooked", Emergency AD 2013-02-51 clearly states:
(g) Modification or Other Action
Before further flight, modify the battery system, or take other actions, in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA.
(g) Modification or Other Action
Before further flight, modify the battery system, or take other actions, in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA.
What?The battery of the APU was incorrectly wire to the main battery? There is something else that's not being explained.There is no reason for any interconnect between the two batteries unless they are meant work in series. Something doesn't make sense in that statement.
From what I have heard, all the batteries are wired together in a "gang".
The eight cells in each battery are contained in a "gang" assembly, complete with thermal protection, electrical isolation, and monitoring circuitry.
The main and APU batteries are interconnected in a complex circuit that allows either battery to serve certain essential loads, most notably starting the APU. The default mode is both batteries in tandem (parallel, not series) for starting the APU. In the event of a failure of either battery, the other battery can handle the load on its own (albiet generating quite a bit more heat...)
The main and APU batteries are interconnected in a complex circuit that allows either battery to serve certain essential loads, most notably starting the APU. The default mode is both batteries in tandem (parallel, not series) for starting the APU. In the event of a failure of either battery, the other battery can handle the load on its own (albiet generating quite a bit more heat...)
What are the people at Boeing thinking? I use lipo batteries in my RC planes and you have to charge them in a charging bag. They catch on fire sometimes. I have no people on the planes Boeing should do the same thing.