dghiggins
Topic Author
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Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 5:27 am

What might have caused this .....?


http://nz.totaltravel.yahoo.com/a/-/...e-loses-cabin-pressure-mid-flight/

An Emirates plane carrying 184 people lost cabin pressure yesterday and had to turn back to Dubai.

The incident occurred on Monday afternoon during the flight from Dubai to Kolkata, India.

An Emirates spokesperson told the Associated Press the airline is investigating the incident and "taking all steps to minimise any inconvenience to its passengers".

No one was hurt and passengers were put on a replacement flight on a different aircraft later in the day.
 
KDTWflyer
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 5:50 am

A multitude of causes can lead to an in-flight depressurization from the very remote (in-flight meteor strikes) to the more common (metal-fatigue failures etc. ) so who knows at this point.
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Auchmithie
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 5:57 am

Aircraft was A330-200 A6-EKQ operating EK572 DXB-CCU.
 
HiJazzey
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 6:00 am

Quoting KDTWflyer (Reply 1):
in-flight meteor strikes

I'm intrigued by this. When did it happen? Any links?
 
ABpositive
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 6:43 am

Or even more common worn out seals on doors.

[Edited 2011-10-17 23:43:36]
 
TravellerPlus
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 7:09 am

LAN flight coming into Auckland had a close encounter with a meteor. Needless to say, a meteor would cause more than a loss of cabin pressure...

http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10431624
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Tomescu
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 11:13 am

Quoting HiJazzey (Reply 3):

I highly doubt it that anything falling from the orbit, like satellite debris, would ever hit an aircraft in mid-air.
 
SAAFNAV
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 12:03 pm

Quoting KDTWflyer (Reply 1):


A multitude of causes can lead to an in-flight depressurization from the very remote (in-flight meteor strikes) to the more common (metal-fatigue failures etc. ) so who knows at this point.

We had the flight deck Air-Con turbine pack up the other day... Not good hearing something that spins at 80 000rpm start making metallic noises.

Erich
On-board Direction Consultant
 
ASA
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 1:57 pm

Quoting Tomescu (Reply 6):
I highly doubt it that anything falling from the orbit, like satellite debris, would ever hit an aircraft in mid-air.

But theoretically, it's possible right? Or if you put it the other way, you CAN'T say that it's IMPOSSIBLE (theoretically) 

Now, that would be a cool bonehead Hollywood movie!   
 
Stabilator
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 2:44 pm

Quoting Tomescu (Reply 6):

When that piece of space junk was forecast to fall out of the sky, there was a special NOTAM warning of falling space debris. Heard it every time I called for my weather briefing until it came down."Pilots are urged to report any falling space debris and remain well clear" or something like that haha.
So we beat on against the current, borne back ceaselessly into the past.
 
sw733
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 2:49 pm

Quoting Stabilator (Reply 9):
When that piece of space junk was forecast to fall out of the sky, there was a special NOTAM warning of falling space debris. Heard it every time I called for my weather briefing until it came down."Pilots are urged to report any falling space debris and remain well clear" or something like that haha.

Big difference, though. Natural space materials fall on to the earth many times each day.
 
redflyer
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 2:51 pm

Quoting ABpositive (Reply 4):
Or even more common worn out seals on doors.

Or even more common: a rupture or leak in the plumbing associated with the pressurization system.
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VgnAtl747
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 3:05 pm

Quoting Stabilator (Reply 9):
"Pilots are urged to report any falling space debris and remain well clear" or something like that haha.

Like that's something to easily avoid when you're traveling along at 500mph and something is falling from space at terminal velocity.
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YYZYYT
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 3:16 pm

Quoting Tomescu (Reply 6):

I highly doubt it that anything falling from the orbit, like satellite debris, would ever hit an aircraft in mid-air.

Hey, didn't you hear - there's a 5% chance of that happenning... at least according to this article.

I especially love the part about "reports" that a meteor actually brought down AF447!   

http://blogs.discovermagazine.com/co...-meteor-bring-down-air-france-447/
 
roseflyer
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 3:30 pm

I can't open the article, but the majority of cases involving the airplane not being able to maintain pressurization are caused by failed PACs (DXB-CCU is not ETOPS, so they can dispatch with an INOP PAC), failed seals, or a form of cabin breach (most common is damage due to ground loading causing a small rupture or dent and as the airplane pressurizes it opens further and not a meteor!).

Not sure what happened, but I'd be curious if it was a rapid decompression or a slow decompression. Most airplanes will maintain adequate cabin pressure for 4-5 minutes after a failure of the pressurization system, so that masks are not needed.
If you have never designed an airplane part before, let the real designers do the work!
 
SEA
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 3:37 pm

AV Herald article doesn't shed much light on what happened, but at only 100 miles out, I wonder if it's a mechanical issue: http://avherald.com/h?article=444b03fb&opt=0
 
YULWinterSkies
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 4:36 pm

Quoting Tomescu (Reply 6):
I highly doubt it that anything falling from the orbit, like satellite debris, would ever hit an aircraft in mid-air.

It is extremely unlikely, but if they cross paths, impact will happen, like for any two objects in movement.

Quoting TravellerPlus (Reply 5):
Needless to say, a meteor would cause more than a loss of cabin pressure...

It could be a big one able to basically perforate either a wing or the fuselage, but most meteors are going to be smaller pieces, either because the initial meteor impacting the Earth has already fragmented in multiple pieces in the upper atmosphere or has largely disintegrated by the time it reaches jet flight altitude. (most will have in fact completely disintegrated by then)
Most of these objects falling on Earth are very small and are generally unnoticed, and these probably would not fatally damage a flying airplane, perhaps gradual loss of pressure could happen it the fuselage is impacted but not perforated in full, but I'm not expert.
Antarctica is the place of choice to study meteorites, because they remain preserved in ice basically forever and are easy to find when entrapped in ice, and yes, most of them are really small (gravel size)

However, as previously stated, sealing and metal fatigue are by far most likely.
When I doubt... go running!
 
yyzame
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 7:20 pm

This isn't that big of a deal .. happen's a lot more than you think it would!
 
Motorhussy
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 8:37 pm

What does a sudden cabin depressurisation feel like? Would you notice it if it weren't for the popping ears and the oxy masks dropping from the ceiling?

Regards
MH
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skysurfer
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 9:19 pm

Could it be that the outflow valve simply failed?
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virginson937
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Tue Oct 18, 2011 10:19 pm

Quoting RoseFlyer (Reply 14):
Most airplanes will maintain adequate cabin pressure for 4-5 minutes after a failure of the pressurization system, so that masks are not needed.

I believe depending on the height of the aircraft, the masks drop down at an approx. cabin pressure of 14,000ft. And the time of useful conciousness is decreased as the aircraft altitude increases. What height was the aircraft at when the depressurisation occurred?

Will
 
737tdi
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Wed Oct 19, 2011 12:06 am

Quoting motorhussy (Reply 18):
What does a sudden cabin depressurisation feel like? Would you notice it if it weren't for the popping ears and the oxy masks dropping from the ceiling?

Regards
MH
Quoting motorhussy (Reply 18):
What does a sudden cabin depressurisation feel like? Would you notice it if it weren't for the popping ears and the oxy masks dropping from the ceiling?

Regards
MH

MH: I have never experienced one in flight but have done them multiple times on the ground. Yes your ears go nuts and you can even feel it in your eyes, plus it gets pretty cold.

As a mech. a few years back we used to pressurize DC-8 freighters to about 8psi differential pressure and then manually dump the pressure (it has a "lollipop" that can be lifted to manually open the outflow valve to full open). The cabin would fog up like the worst night in London. Don't worry it doesn't hurt anything! except your ears and it is loud if you are outside the aircraft.
 
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Wed Oct 19, 2011 12:20 am

Quoting motorhussy (Reply 18):
What does a sudden cabin depressurisation feel like? Would you notice it if it weren't for the popping ears and the oxy masks dropping from the ceiling?

When it happened to me 10+ years ago on an EK 772 (told it was an issue with the air con system freezing up) I don't recall feeling any loss of ear pressure- but I do remember an awfully high pitched whistling noise in the cabin- just when it was becoming unbearable the oxygen masks dropped ("emergency! emergency! emergency!") and we dived to 10,000 feet.
 
wn700driver
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Wed Oct 19, 2011 12:27 am

Quoting motorhussy (Reply 18):

What does a sudden cabin depressurisation feel like? Would you notice it if it weren't for the popping ears and the oxy masks dropping from the ceiling?

It would become very hard to hear, and the cabin would likely fog to the point that you'd have a hard time seeing the person next to as well. I imagine it would be a little disconcerting, but not outright terrifying or anything...
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BE77
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RE: Emirates Plane Loses Cabin Pressure Mid-flight

Wed Oct 19, 2011 12:58 am

Quoting YULWinterSkies (Reply 16):
It is extremely unlikely, but if they cross paths, impact will happen, like for any two objects in movement.

And of course, if the sucker that caused this one hit within say 1000 nm of where you were flying it would ruin your day...
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