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nuckolls.bob(at)aeroelect
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 Posted: Fri Jul 19, 2013 9:28 am Post subject: Heathrow 787 fire |
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| Quote: |
ps: The 787 has yet ANOTHER battery problem. Yikes!
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I've been reading some of the un-journalistic babbling
about the Heathrow event. Yes, the ELT was located in
the fire zone. Yes, it contains a lithium battery. But . . .
The history of this design goes back about 8 years
with 6000+ in service. The battery is never 'charged'
hence any triggering event for battery failure is limited
to electronic failure in the ELT or external environmental
effects (temperature, vibration, etc.).
The paper, voice and byteprint pundits are not
known for their sense of history or technical acumen.
A mention of the word 'lithium' in an aviation
context has the effect of an overdose of meth.
I remain skeptical that the ELT battery is
root cause of this event but hopefully, more
level headed investigators will ultimately
prevail.
There is another feature of the 797 construction
that I find more disturbing.
Look through the collection of videos and pictures
for the SFO event. As soon as the wreckage comes
to rest people are exiting the front of the aircraft
on slides, many carrying their bags. Even videos
of trucks spraying water and/or foam are remarkably
clear of visible flames.
Aftermath pictures show little evidence of
active burning outside the fuselage eitehr right
or left side. There is no evidence of burn thru
from outside.
Yet, there are huge holes in the fuselage top
which had to be caused by release of combustion
energy inside the fuselage. Fortunately, by
the time all that stuff was fully involved,
the airplane was largely empty of passengers.
This offers questions about the combustibility
of materials in the cabin.
Check the few pictures of the Heathrow
event airplane. Once again we see evidence of
heat damage to outside of the aircraft no doubt
caused by combustion of stuff inside the airplane
with convection concentrating effects on the
roof of the cabin.
No doubt the ELT was burned. Recall that Swissair 111
suffered a cabin fire that started with arcing of
wires with damaged insulation but PROPAGATED by
combustible materials adjacent to the failed
wires.
I am reluctant to jump onto the lithium wagon
for assigning root cause to this event.
Bob . . .
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mmayfield
Joined: 09 Oct 2009
Posts: 40
Location: NSW Central Coast, Australia
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| Posted: Wed Jul 24, 2013 6:21 pm Post subject: Re: Heathrow 787 fire |
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Only a few days ago the AAIB released this special report, which may be the source of some of the news reports.
It seems that they do indeed hold the ELT as prime suspect. The aircraft was unpowered at the time, and the AAIB notes that the ELT is the only item in the area with enough stored energy to initiate combustion under these circumstances.
http://www.aaib.gov.uk/cms_resources.cfm?file=/S5-2013%20ET-AOP.pdf
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_________________
Mike |
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nuckolls.bob(at)aeroelect
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| Posted: Thu Jul 25, 2013 5:08 am Post subject: Heathrow 787 fire |
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At 09:21 PM 7/24/2013, you wrote:
| Quote: |
<mmayfield(at)ozemail.com.au>
Only a few days ago the AAIB released this special report, which may
be the source of some of the news reports.
It seems that they do indeed hold the ELT as prime suspect. The
aircraft was unpowered at the time, and the AAIB notes that the ELT
is the only item in the area with enough stored energy to initiate
combustion under these circumstances.
http://www.aaib.gov.uk/cms_resources.cfm?file=/S5-2013%20ET-AOP.pdf
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Thank you sir! Much appreciated.
Bob . . .
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