Japan sending Boeing 787 Dreamliner investigators to United States
TOKYO Japan's Civil Aviation Bureau is sending investigators looking into problems with Boeing 787 batteries to Seattle, where the aircraft are assembled.
The Transport Ministry said members of the team working on the investigation would leave Tokyo on Sunday for Seattle. It provided no further details.
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The U.S. Federal Aviation Administration and Boeing (BA) earlier dispatched investigators to join the probe in Japan.
All 50 Boeing 787s in use were grounded after a lithium-ion battery in a 787 flight by All Nippon Airways on Jan. 16 overheated, forcing an emergency landing. Earlier in January, a 787 operated by ANA's rival Japan Airlines suffered a battery fire while parked at a Boston airport.
Investigators on both sides are trying to determine why the batteries have overheated and how to fix the problem.
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overheated during the operation. Because the temperature goes up to melt down the structure of the battery
And creates a short circuit. The battery pack drives a lighting load and a motor or a group of motor load.
When thes motors start will draw 400.00% of the normal operating current. If the battery is under design, it will getting
Hotter . The way to solve this heating problem is to add more cells to provide 400.00%of the operating current
And reduce charging time by start charging above 80.00%full. Current battery useful life will be shorter if it charging
At lower than 80.00 % full capacity .Manufacturer should have test data to back it up. Find a optimum recharging voltage. Provide heatisink
And a fan to channel heat out of the box. Increase the mass of the battery can dissipate more heat.
Running out battery on my Ipad2
And I must stop.
.
Question: I watched a special on the 787 (before this trouble) and there was no hint of the battery problem. It also did not develop during extensive long distance beta trials. Why not?
Thanks