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.
Never argue with idiots. They will bring you down to their level, and beat you with experience.
Dufo From Slovenia, joined May 1999, 778 posts, RR: 4 Reply 2, posted (7 months 2 weeks 3 days 16 hours ago) and read 4689 times:
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]
I seriously think I just creamed my pants without any influence from any outside variables.
B777LRF From Luxembourg, joined Nov 2008, 1142 posts, RR: 3 Reply 5, posted (7 months 2 weeks 3 days 15 hours ago) and read 4620 times:
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).
From receips and radials over straight pipes to big fans - been there, done that, got the hearing defects to prove
bikerthai From United States of America, joined Apr 2010, 1894 posts, RR: 4 Reply 6, posted (7 months 2 weeks 2 days 15 hours ago) and read 4170 times:
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).
Make that 5 tabs total and who knows how many tabs on the hinge side.
bikerthai From United States of America, joined Apr 2010, 1894 posts, RR: 4 Reply 11, posted (7 months 1 week 2 days 23 hours ago) and read 2866 times:
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.
rwessel From United States of America, joined Jan 2007, 2132 posts, RR: 2 Reply 14, posted (7 months 1 week 2 days 6 hours ago) and read 2687 times:
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.