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Author Topic: Southwest flight diverted to Yuma after sudden pressure loss  (Read 10759 times)
avalon
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« on: April 01, 2011, 09:43:57 PM »

http://www.azcentral.com/news/articles/2011/04/01/20110401southwest-flight-diverted-cabin-pressure-drop-abrk01-ON.html

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cptbrw
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« Reply #1 on: April 02, 2011, 08:07:50 AM »

http://avherald.com/h?article=43a4ac26&opt=0
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kyle172
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« Reply #2 on: April 02, 2011, 10:54:34 AM »

http://
« Last Edit: April 02, 2011, 10:58:06 AM by kyle172 » Logged

If you don't see it first then I probably will..
ferg2k
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« Reply #3 on: April 02, 2011, 12:24:21 PM »

http://flightaware.com/live/flight/SWA812/history/20110401/2225Z/KPHX/KNYL/tracklog
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avalon
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« Reply #4 on: April 02, 2011, 01:13:38 PM »

Southwest Grounds 81 Planes

http://www.nytimes.com/2011/04/03/us/03plane.html
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atkinsonwilliam
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« Reply #5 on: April 02, 2011, 01:34:17 PM »

Is there any audio out on this yet?HuhHuh

I saw one news here in Dallas reported that a passenger sent a txt to his wife that said "PLANE IS GOING DOWN, I LOVE YOU".....can you even imagine what was going on in that cabin......thank god everyone was ok...

« Last Edit: April 02, 2011, 01:36:42 PM by atkinsonwilliam » Logged
alltheway
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« Reply #6 on: April 02, 2011, 04:18:00 PM »

Not to be a smart*ss, but I'll try it anyway...

There are more cases known for crown breaching holes where most cases was blown out somewhat. Might be a little cabin over pressure? This one looks like the pressure came from outside (bad weather?) with a little less cabin pressure?

I know of the severe testing with the BBJ (737-700) to set the cabin pressure at 7000 feet instead of 8000....

reason for thinking this is the weather in the USA, where one jetstream comes from Canada and the second from Mexico and merge over the USA and then over the Atlantic ocean...

There is just some more weather issue than elsewhere in the world there....
« Last Edit: April 02, 2011, 04:20:35 PM by alltheway » Logged
avalon
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« Reply #7 on: April 02, 2011, 10:02:06 PM »

NTSB “Go Team” investigating Southwest Airlines flight 812


http://www.yumasun.com/articles/http/11200okdate:sun-68911-03apr201101:28:06gmtserver:apache/1337%28unix%29php/525xpoweredby:php/525pragma:nocachecachecontrol:nocacheconnection:closecontenttype:text/plain;charset=iso88591plane-yuma.html
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NoMad
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« Reply #8 on: April 03, 2011, 08:22:52 AM »

Not to be a smart*ss, but I'll try it anyway...

There are more cases known for crown breaching holes where most cases was blown out somewhat. Might be a little cabin over pressure? This one looks like the pressure came from outside (bad weather?) with a little less cabin pressure?

I know of the severe testing with the BBJ (737-700) to set the cabin pressure at 7000 feet instead of 8000....

reason for thinking this is the weather in the USA, where one jetstream comes from Canada and the second from Mexico and merge over the USA and then over the Atlantic ocean...

There is just some more weather issue than elsewhere in the world there....

That makes absolutely no sense at all.  What's more likely is the wind from the aircraft going 300mph pushed that piece of the ceiling material down. The exterior skin of the aircraft IS pushed up and out. 
« Last Edit: April 03, 2011, 11:52:34 AM by NoMad » Logged
alltheway
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« Reply #9 on: April 03, 2011, 12:33:54 PM »

Quote
The exterior skin of the aircraft IS pushed up and out.

I can't see that, but to clarify why I think it's a weather related pressure from outside is that I read at the Avherald site this is a 6 foot gap, so it's not just a hole....

So if you would push one side of an airplane hard enough a gap would occur, if there's overpressure from inside it would create a hole, but not a 6 foot gap...
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avalon
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« Reply #10 on: April 03, 2011, 04:06:19 PM »

"Clear evidence that the skin separated at the lower rivet line" -  NTSB member Robert Sumwalt

http://www.cnn.com/2011/TRAVEL/04/03/arizona.flight.diverted/index.html?hpt=T1
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joeyb747
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Nothing Like A 747!


« Reply #11 on: April 03, 2011, 07:18:51 PM »

The aircraft involved is Boeing 737-3H4 N632SW (cn 27707/2799), delivered 06/13/96. Not a very old aircraft, but a well used aircraft, with lots of short cycles on her. I think it is possible that this is more a case of metal fatigue then anything else, given statements like in avalons post:

"Clear evidence that the skin separated at the lower rivet line".

Read the opening paragraph of the article avalon linked to:

"Investigators found "widespread cracking" on the skin of a Southwest Airlines Boeing 737 that made an emergency landing in Arizona after a hole opened on top of the aircraft during flight Friday, a National Transportation Safety Board member said Sunday."
« Last Edit: April 03, 2011, 07:21:54 PM by joeyb747 » Logged

Aircraft Mechanic
avalon
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« Reply #12 on: April 04, 2011, 05:48:13 PM »

FAA will issue emergency directive on Tuesday, requiring inspections of certain Boeing 737-300, -400 and -500 aircraft that have more than 30,000 flight cycles. 

http://www.reuters.com/article/2011/04/04/us-southwest-faa-idUSTRE73362V20110404
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NoMad
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« Reply #13 on: April 04, 2011, 07:06:54 PM »

Quote
The exterior skin of the aircraft IS pushed up and out.

I can't see that, but to clarify why I think it's a weather related pressure from outside is that I read at the Avherald site this is a 6 foot gap, so it's not just a hole....

So if you would push one side of an airplane hard enough a gap would occur, if there's overpressure from inside it would create a hole, but not a 6 foot gap...
That still makes ABSOLUTELY no sense at all.  Not the "weather related pressure" and not this gap vs hole thing you've come up with.  I don't think you understand how weather, atmospheric pressure, and cabin pressure work nor do you understand how aircraft are constructed.  And besides that, the actual facts of the incident (which is what everyone else suspected would be the case) show it was clearly not what you're theorizing.
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joeyb747
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Nothing Like A 747!


« Reply #14 on: April 04, 2011, 08:39:55 PM »

FAA will issue emergency directive on Tuesday, requiring inspections of certain Boeing 737-300, -400 and -500 aircraft that have more than 30,000 flight cycles.  

http://www.reuters.com/article/2011/04/04/us-southwest-faa-idUSTRE73362V20110404

Opening line:

"The government will order emergency checks of certain older model Boeing Co 737s for the kind of fatigue cracks that prompted Southwest Airlines Co to cancel hundreds of flights."

I reference my previous post. Metal fatigue is the most likely culprit here in my mind. Let us recall a couple other incidents in which metal fatigue was the cause of an incident.

Aloha 243 comes to mind:

http://en.wikipedia.org/wiki/Aloha_Airlines_Flight_243

Also Air China 611:

http://en.wikipedia.org/wiki/China_Airlines_Flight_611
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Aircraft Mechanic
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