NoWorries
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Boeing 787 Withstands First Lightning Strike

Thu Jun 17, 2010 1:23 pm

It shouldn't come as any surprise, but the 787 survived its first strike ...

http://www.businessweek.com/news/201...tning-strike-as-tests-advance.html
 
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bikerthai
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RE: Boeing 787 Withstands First Lightning Strike

Thu Jun 17, 2010 1:47 pm

It really depends on where the lighting hit. I mean, if it hit the engine naccelle, the empenage, the radome, trailing surfaces, then the reaction wouldn't be any different than it would if the lightning hit a 777 because the construction of those items are the same (or almost the same).

It will be interesting to follow this development. I'm just tagging this to better track this discussion.

bikerthai
Intelligent seeks knowledge. Enlightened seeks wisdom.
 
BlatantEcho
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RE: Boeing 787 Withstands First Lightning Strike

Fri Jun 18, 2010 3:29 am

It's going to get struck by lightning all the time in service, of course it's going to do fine.

Sure, it's super top secret carbon-fiber....but you think this didn't get planned for?
They're not handing trophies out today
 
NoWorries
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RE: Boeing 787 Withstands First Lightning Strike

Fri Jun 18, 2010 11:16 am

I am a little curious -- the article mentions that there were no signs of any damage. When an inspection is performed after a strike, how often are there no signs of damage vs. signs of some damage vs. serious damage. Would it be safe to say that most of the time there is little or no damage? Many modern planes have at least some parts made of composite -- is the incidence of damage for those parts comparable to more traditional material?

[Edited 2010-06-18 04:20:37]
 
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SEPilot
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RE: Boeing 787 Withstands First Lightning Strike

Fri Jun 18, 2010 7:09 pm

I certainly find this encouraging-this was the biggest worry I had about the 787, even though I had confidence that the Boeing engineers had adequately provided for it. I had no fear that lightning would actually bring the plane down, but I was concerned that it might burn out some of the wire mesh embedded in the composite, which would be a very expensive thing to repair. But it is very good news to me that it actually encountered lightning and survived unscathed.
The problem with making things foolproof is that fools are so doggone ingenious...Dan Keebler
 
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HAWK21M
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RE: Boeing 787 Withstands First Lightning Strike

Fri Jun 18, 2010 8:49 pm

Quoting NoWorries (Reply 3):
the article mentions that there were no signs of any damage

Thats odd,shouldn't there be an Entry & Exit point post lightening strike.
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
planenutok
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Joined: Tue Mar 25, 2008 5:07 am

RE: Boeing 787 Withstands First Lightning Strike

Fri Jun 18, 2010 11:21 pm

Quoting HAWK21M (Reply 5):
Quoting NoWorries (Reply 3):
the article mentions that there were no signs of any damage

Thats odd,shouldn't there be an Entry & Exit point post lightening strike.
regds
MEL.

Every lightening strike that I have worked has had damage to some extend if it was actually hit. The damage varies from discolored paint at entry or exit, to holes in the airframe and blown off static wicks. Now a suspected lightening strike on the other hand may or may not have actually hit the airframe but the crews will still write up a strike if they see a bright flash close by. That's my 2 cents.
 
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HAWK21M
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RE: Boeing 787 Withstands First Lightning Strike

Sun Jun 20, 2010 3:09 pm

Quoting Planenutok (Reply 6):
but the crews will still write up a strike if they see a bright flash close by

Flash visible closeby in Flight would mean a high chance that the Aircraft in question has encountered lightening strike.So there would have to be an Entry & exit point.
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
mrskyguy
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RE: Boeing 787 Withstands First Lightning Strike

Mon Jun 21, 2010 12:20 am

One would imagine this is tested extensively on the ground in controlled lightning generation facilities, no? I'd imagine the effects of a lightning discharge on these materials would be well known and documented, leaving the airborne proving runs for the FAA's requirements.
"The strength of the turbulence is directly proportional to the temperature of your coffee." -- Gunter's 2nd Law of Air
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Boeing 787 Withstands First Lightning Strike

Mon Jun 21, 2010 2:26 am

Quoting MrSkyGuy (Reply 8):
One would imagine this is tested extensively on the ground in controlled lightning generation facilities, no?

They are. Which is why it's so hilarious to watch so many people think this is some kind of huge unknown risk.

Quoting MrSkyGuy (Reply 8):
I'd imagine the effects of a lightning discharge on these materials would be well known and documented

They are. Have been for more than 25 years.

Quoting MrSkyGuy (Reply 8):
leaving the airborne proving runs for the FAA's requirements.

You don't have to prove lightning strike capability by flight test (that would be a stupid way to "prove" it anyway)...you never intentionally get the plane hit by lightning for commercial certification.

Tom.

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