On Mon, 25 Feb 2013 14:49:34 -0600, Richard
wrote:
On 2/25/2013 1:06 PM, Spehro Pefhany wrote:
On Mon, 25 Feb 2013 13:08:16 -0500, wrote:
On Mon, 25 Feb 2013 07:46:01 +0000, wrote:
On Sat, 23 Feb 2013 22:53:02 +0000 (UTC), (Bradley K.
Sherman) wrote as underneath my scribble :
Thanks for the mini updates here . appreciated. C+
|
| After meeting with Boeing executives, top federal aviation
snip
--bks
Appartently on at least one plane the APU was miss-wired.
No indication that I've seen (so far) that it was significant to the
problem. Could have been a shield grounded at the wrong end, a
different wire gauge than the drawings or something like that.
And it MIGHT have been the battery voltage sense wire.
Why are we guessing at this?
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Japan's Transport Ministry said that an investigation into the
overheating of a lithium ion battery in an All Nippon Airways (ANA)
Boeing 787 discovered it had been improperly wired.
The Transport Safety Board said that the battery of the aircraft's
auxiliary power unit (APU) was incorrectly connected to the main
battery that overheated.
However, it added that a protective valve would have prevented power
from the APU from doing any damage.
The safety board said that more analysis was needed
Perhaps they should have stated "a protectiive valve SHOULD have
prevented power from the APU from doing any damage"