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Is The Cargo Area In The A330F Unpressurized?

Sun Apr 21, 2013 5:57 pm


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This photo got me thinking. The door between the cargo area and the front cockpit/galley area in the A330F seems to be quite thick. Is this because it is a pressurization door? Does this mean that the cargo area is unpressurized? I always thought that the cargo area is pressurized on modern freighters.
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RE: Is The Cargo Area In The A330F Unpressurized?

Sun Apr 21, 2013 6:29 pm

Of course NOT. Does appear to be quite secure though. Probably has more to do with dealing with pressurization failure.
 
Dufo
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RE: Is The Cargo Area In The A330F Unpressurized?

Sun Apr 21, 2013 8:49 pm

In order to have the cargo compartment properly classified (Class A to F if I am not mistaken), there has to be sufficient isolation from flight deck regarding smoke and fire extinguising capabilities.
Some cargo planes use smoke curtains and newer type (especially ones built as freighters) such doors on the main deck.
Additionally, load has to be restrained by at least 9 G load barrier or net.

[Edited 2013-04-21 13:51:41]
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TWA772LR
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RE: Is The Cargo Area In The A330F Unpressurized?

Sun Apr 21, 2013 9:01 pm

Then what happens if live cargo or certain pharmaceuticals get shipped on this aircraft? Is there an option to pressurize the hold?
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Dufo
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RE: Is The Cargo Area In The A330F Unpressurized?

Sun Apr 21, 2013 9:24 pm

Hold is normally pressurized, you cannot depressurize only certain parts of the aircraft.
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B777LRF
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RE: Is The Cargo Area In The A330F Unpressurized?

Sun Apr 21, 2013 10:22 pm

All holds and compartments on the F are pressurised and ventilated the same way as a pax version, including the main-deck. What you see on the picture is the 9G wall, which acts both as a barrier against cargo moving forward in an emergency (hence the thickness) and as a smoke barrier (hence the somewhat elaborate locking mechanism).
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bikerthai
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RE: Is The Cargo Area In The A330F Unpressurized?

Mon Apr 22, 2013 10:18 pm

Quoting B777LRF (Reply 5):
(hence the somewhat elaborate locking mechanism).

If you are referring to the two metal tab in the door (and looks like two more at the bottom of the door), I would guess that is part of the mechanism for transferring load through the door to the sidewall and floor..

Smoke and fire can be handled using compressible silicone seals and gaskets (maybe at the door frame interface).

bt

Make that 5 tabs total and who knows how many tabs on the hinge side.

[Edited 2013-04-22 15:19:16]
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Aesma
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RE: Is The Cargo Area In The A330F Unpressurized?

Tue Apr 23, 2013 8:19 pm

So when a fire calls for depressurization of the hold and flying at altitude, I guess the crew has to use oxygen masks.
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Dufo
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RE: Is The Cargo Area In The A330F Unpressurized?

Tue Apr 23, 2013 10:20 pm

Donning the masks is mandatory for every procedure involving suspected smoke or fire on transport planes I flew so far. Not all dangerous fumes can be seen, felt or smelt.
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bikerthai
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RE: Is The Cargo Area In The A330F Unpressurized?

Wed Apr 24, 2013 12:26 pm

Quoting Aesma (Reply 7):
So when a fire calls for depressurization of the hold and flying at altitude,

Do you mean depressurization or venting? If it is depressurization, I'd be curious to know what mechanism is used.

bt
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Aesma
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RE: Is The Cargo Area In The A330F Unpressurized?

Sat Apr 27, 2013 7:56 pm

I mean depressurization as in, no oxygen, no fire. Unless what is burning doesn't need oxygen.
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bikerthai
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RE: Is The Cargo Area In The A330F Unpressurized?

Mon Apr 29, 2013 2:33 pm

When depressurization happens, you want to depressurize both the upper lobe and the lower lobe at the same time to prevent breaking the floor beams. So if you want to depressurize the cargo area, you'll have to know if the pressure bulkhead extends bellow the floor or you'll have to depressurize the whole airplane. In latter case, the partition would be useless as a pressure barrier. Shrug.

I would be interested to see how they deal with the pressure differential in the 747 Dream lifter. I heard that the aft cargo bay is UN-pressurized.

bt
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rwessel
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RE: Is The Cargo Area In The A330F Unpressurized?

Mon Apr 29, 2013 7:47 pm

Quoting bikerthai (Reply 11):
I would be interested to see how they deal with the pressure differential in the 747 Dream lifter. I heard that the aft cargo bay is UN-pressurized.

There's a big pressure bulkhead just aft of the (remaining) forward passenger door. Everything forward of that is pressurized as normal.
 
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bikerthai
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RE: Is The Cargo Area In The A330F Unpressurized?

Mon Apr 29, 2013 9:52 pm

Yes,

I wanted to know how the pressure bulkhead is dealt with in the lower lobe.

bt
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rwessel
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RE: Is The Cargo Area In The A330F Unpressurized?

Tue Apr 30, 2013 6:45 am

Quoting bikerthai (Reply 13):
I wanted to know how the pressure bulkhead is dealt with in the lower lobe.

As far as I know, the (one) bulkhead transects the cargo deck as well. Anything else would require reinforcing some of the main deck floor to hold pressure, which would be a much larger structural problem.
 
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bikerthai
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RE: Is The Cargo Area In The A330F Unpressurized?

Tue Apr 30, 2013 1:12 pm

Quoting rwessel (Reply 14):

As far as I know, the (one) bulkhead transects the cargo deck as well.

I'd be interested to see how they did it . . .

Maybe I'll get a chance one day.

bt
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HAWK21M
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RE: Is The Cargo Area In The A330F Unpressurized?

Tue Apr 30, 2013 5:58 pm

Its a door that seperates the main deck from the supernumery area and Flight deck,it needs to be sealed to prevent fire from spreading and smoke moving towards the cockpit.
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