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Old Jan 25, 2013, 09:08 AM
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Read up-the 787 has the least pressure differential of any aircraft.
Old Jan 25, 2013, 09:23 AM
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Originally Posted by Cap_n_Dave View Post
Another thing mentioned in some of the media coverage was the lack of a monitoring/warning system for the aircrew.

Additionally, the FAA was (supposedly) concerned about the batteries and worked with Boeing to develop "mitigations" (I am not familiar with what these mitigations are) ... evidently the FAA has some serious concerns that the mitigations failed.

It will be interesting to read the NTSB report when it is published.
Like I said, Boeing (or their subcontractor) was probably pushing the performance envelope too far. They probablyporposed some "band-aid" solutions to NTSB which didn't wash. IMO, Air Japan reacted properly and lit a fire under the Feds. The earlier fuel leaks were also worrisome.

PPRuNe, a UK pro pilot's discussion board, has a good thread on this issue:

http://www.pprune.org/rumours-news/5...unds-787s.html

The Dreamliner is a international project-- here is a graphic from the above thread:



--Bill
Old Jan 25, 2013, 09:33 AM
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A bridge too far....
Old Jan 25, 2013, 09:56 AM
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Originally Posted by The Tug View Post
Possibly they were using HK equipment.
When I saw the title I was going to say "I guess they're using hobbyking batts".

Beat me to it!
Old Jan 25, 2013, 09:58 AM
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When I saw the title I was going to say "I guess they're using hobbyking batts".

Beat me to it!
Can't you just see the Boeing warranty claim and the reply: NTSB report, which the on-line support rejects!
Old Jan 25, 2013, 11:01 AM
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Like I said, Boeing (or their subcontractor) was probably pushing the performance envelope too far.
What does this have to do with a battery monitoring and disconnect system?

BTW thank you for the link to the PPRune forum. Interesting and informative discussion.
Old Jan 25, 2013, 11:37 AM
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Originally Posted by JohnathanSwift View Post
Read up-the 787 has the least pressure differential of any aircraft.
What I've read is a difference of 500 feet from others. They say it makes a difference in comfort. Something was wrong with that battery, but what and why. Who knows, maybe it was damaged before ever leaving the battery factory. It'd be useful if they can trace it and repeat it in testing.
Old Jan 25, 2013, 11:43 AM
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Well, that's not the spec I've read: seems it is much closer to 29.92 than any other system.

"Comfort" is the natural, but not the only consequence of being closer to sea level pressure.
Old Jan 25, 2013, 01:46 PM
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Thanks for posting that graphic, Bill.

Interesting how the corporation has apparently decided to exchange an offshore component supply chain, requiring a huge overhead of middle management and inspectors for domestic worker wages.
I don't think it will fare well for us, here in the states.
Old Jan 25, 2013, 01:53 PM
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Hm. A LiPO caught fire...gee, that's NEVER happened before.



They should refit for SLABs, until they get this issue figured out.
Old Jan 26, 2013, 12:50 PM
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Quote:
Originally Posted by Cap_n_Dave View Post
Another thing mentioned in some of the media coverage was the lack of a monitoring/warning system for the aircrew.

Additionally, the FAA was (supposedly) concerned about the batteries and worked with Boeing to develop "mitigations" (I am not familiar with what these mitigations are) ... evidently the FAA has some serious concerns that the mitigations failed.

It will be interesting to read the NTSB report when it is published.

I my own considerable experience with the FAA, "mitigations" come in the form of a mountain of reports, studies and committee results that can be piled up sufficiently high to cover any potentially responsible FAA employees ass from being directly observed and/or targeted.
Old Jan 28, 2013, 05:15 PM
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I my own considerable experience with the FAA, "mitigations" come in the form of a mountain of reports, studies and committee results that can be piled up sufficiently high to cover any potentially responsible FAA employees ass from being directly observed and/or targeted.
Indeed.

Are you familiar with the mitigations that were supposedly put in place (regarding the battery)? I am curious.

"Mountain of paper" doesn't count, lol.
Old Jan 28, 2013, 05:18 PM
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Originally Posted by Cap_n_Dave View Post
Indeed.

Are you familiar with the mitigations that were supposedly put in place (regarding the battery)? I am curious.

"Mountain of paper" doesn't count, lol.
Not specifically, but I am quite sure that Boeing wanted to use those batteries and provided the ample butt cover to the FAA in form of said heap of documents.
Old Jan 28, 2013, 05:32 PM
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... I am quite sure that Boeing wanted to use those batteries and provided the ample butt cover to the FAA in form of said heap of documents.
I wouldn't be surprised, lol.
Old Jan 28, 2013, 07:43 PM
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...I'd be reluctant to say Boeing was set on any specific batteries...

They have experience and a track record...
Concerns are reliability, power to weight ratio, size, and cost efficiency.
rc


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