Jetstar Dreamliner grounded after significant lightning damage
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Jetstar Dreamliner grounded after significant lightning damage
This was kept quiet for a while, article below. Doesn't look like the 787 holds up to lightning strikes as well as an aluminium hull. My experience is with metal airframes but I have been involved in assessing lightning strike damage on composite tips and flight controls, usually the copper mesh gets burnt and there are scorch marks on the composite but no perforation. Looks as if the panels are not electrically bonded correctly to provide a path for the lightning through the aircraft and out of the static wicks.
https://www.smh.com.au/business/comp...17-p5am1p.html
https://www.smh.com.au/business/comp...17-p5am1p.html
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Not the first time a 787 has had a splash of lightning like this, won't be the last. The heating effect is probably the main issue as will lead to the delamination of the carbon fiber.
Individual fasteners may be able to be treated fairly similar to metallic aircraft and replaced.
The skin areas can either have a bolted titanium repair or the more expensive option of a composite flush repair.
The area in the video is a full barrel section, no panels to bond essentially in the traditional sense, there is lightning strike protection but if the energy is sufficient damage with eventuate.
Carbon fiber isn't the best conductor of electricity, which is why instead of using the structure for current return as on metallic aircraft the 787 has a Current Return Network as well.
Static wicks by the way are to bleed off static rather than to handle lightning strikes, just so happens sometimes they are blown off when the path the lightning takes is through one.
Individual fasteners may be able to be treated fairly similar to metallic aircraft and replaced.
The skin areas can either have a bolted titanium repair or the more expensive option of a composite flush repair.
The area in the video is a full barrel section, no panels to bond essentially in the traditional sense, there is lightning strike protection but if the energy is sufficient damage with eventuate.
Carbon fiber isn't the best conductor of electricity, which is why instead of using the structure for current return as on metallic aircraft the 787 has a Current Return Network as well.
Static wicks by the way are to bleed off static rather than to handle lightning strikes, just so happens sometimes they are blown off when the path the lightning takes is through one.
Any damage to a composite airframe requires specialist repair and will probably involve input from Boeing. It's a bit more involved than calling in a skin basher with basic sheet metal tools.
Flight crew on the 78 are normally a bit more conservative regarding WX, stuff that you would normally accept with a conventional airframe will have them calling for headings and offsets.
Flight crew on the 78 are normally a bit more conservative regarding WX, stuff that you would normally accept with a conventional airframe will have them calling for headings and offsets.
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you would normally accept with a conventional airframe
During my flying career, there was no acceptable storm.
Originally Posted by Showa Cho
***Not a pilot***
Is a lightning strike test (somehow) part of the certification process for new aircraft?
Is a lightning strike test (somehow) part of the certification process for new aircraft?
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Seen it all before
As a 8 year line engineer on the 787 we have seen hundreds and hundreds of lightening strikes. However real damage to composite structure is minimal. Usually just requiring a fastener replacement as that's where the lightening goes through. We find the metal matrix does it job quite well.
Eidolon
Originally Posted by Gear in transit
Is that regarded as minimal damage??
