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Brazil - France Flight

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Brazil - France Flight

Lolita said:
http://news.bbc.co.uk/1/hi/world/americas/8076848.stm

tis a lot of ocean to search... do you think they'll find it? any survivors?

bit friggin scary :eek:

http://news.bbc.co.uk/1/hi/world/2008892.stm



it's not lookign good at all so my thoughts go to those on the plane and those who have family and friends on it. hope it's found safe and sound but looking doubtful:(
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Fingers X'd but I doubt the plane will be safe sadly, talking lightning strike & automated system failure transmission in turbulence. I think aircraft do have a signal beacon so the location may be found and floating wreckage. Been a while since we had serious air crashes to think about... hope they dont come in 3's.... :(
 
I saw mention of a missing plane and someone called Ben in the same thread and immediatley thought of "Lost".

I must watch less TV!
 
Ffoxy said:
I think aircraft do have a signal beacon so the location may be found and floating wreckage. Been a while since we had serious air crashes to think about... hope they dont come in 3's.... :(
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Aircraft emit several signals while they're functioning and airborne. This plane isn't though. The Flight Data Recorder and Cockpit Voice Recorder emit signals so they can be found in the event of a crash, but they only have a limited range and battery life (30 days), They have a very large area to search as it is, and it's not like it's that close to the coast either... :(
 
hmm tough call...personally if lightning strikes aircraft (very rare in the first place) but usually everything goes up in flames...(jet fuel masses of electricity = kerblamo...)
As with the black box (actually dynamo orange in colour) not sure as to wether it will be found as it will be at the bottom of the sea by now...
 
pk090 said:
hmm tough call...personally if lightning strikes aircraft (very rare in the first place) but usually everything goes up in flames...(jet fuel masses of electricity = kerblamo...)
As with the black box (actually dynamo orange in colour) not sure as to wether it will be found as it will be at the bottom of the sea by now...
Click to expand...

no it doesn't. it normally just leaves a tiny burn where it hits, and then a bigger burn where it exist. it isn't very rare, just very rare it causes a problem!
 
pk090 said:
hmm tough call...personally if lightning strikes aircraft (very rare in the first place)...
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No it's not.
pk090 said:
...but usually everything goes up in flames...(jet fuel masses of electricity = kerblamo...)
Click to expand...
Bull****. Plenty of aircraft get struck by lightning, and there are very few incidents as a result of it. Aircraft are designed with lightning strikes in mind.
pk090 said:
As with the black box (actually dynamo orange in colour) not sure as to wether it will be found as it will be at the bottom of the sea by now...
Click to expand...
It's not a single black box. The FDR and CVR are separate. These things are designed to be are locatable as possible in the event of an accident - it's just that not only is there are large area to search, they don't know the exact area to search, as they don't know how far it kept going from the last known communication point.
 
well according to our lecturers at uni if the lighting hits the fuel tanks then the aircraft explodes. Aircraft fly though thunderstorms frequently (although not recomended) but its rare for large hits from thnder.
 
pk090 said:
well according to our lecturers at uni if the lighting hits the fuel tanks then the aircraft explodes. Aircraft fly though thunderstorms frequently (although not recomended) but its rare for large hits from thnder.
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i would say he is wrong. there is no spark, the electricity would travel around the tank and exit out the bottom. google faraday cage
 
arc said:
no it doesn't. it normally just leaves a tiny burn where it hits, and then a bigger burn where it exist. it isn't very rare, just very rare it causes a problem!
Click to expand...

Yep It's very common really, and only exacerbated by the fact youre throwing a big chunk of metal through the air. Under FAR-25 and CS-E (aeroengine cert regulations, US and EEC) it's necessary to perform EMC testing on pretty much any kit that's bolted onto an engine, although the same in theory applies at an airframe level - but that's satisfied through testing the components within the system and not doing full integration testing.

Whatever happened to that was a damn good common cause failure. It reminds me of something I heard of on a Boeing product a while back - where gray water could leak onto an electrical union box and disable 2 channels of a 3 channel system (which by definition is probably a safety critical system) . Equally there was a A320 that got struck by a missile in Iraq a few years ago and that managed to disable all 3 hydraulic systems - they landed it using differential thrust control and some awesome guesswork - that sort of failure should be so remote it's deemed to be impossible (1x10-9/engine flying hour), but common causes exist and forever will do...and until they happen we wont know theyre there.
 
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