vfw614 From Germany, joined Dec 2001, 3592 posts, RR: 5 Posted (1 year 6 months 4 days 12 hours ago) and read 2886 times:
I am pretty sure that this must have been discussed, but I could not find a thread, so I am asking:
With more and more Boeing 747-400 getting converted into freighters, I am wondering what happens to the rather extensive upper floor area? The factory-fresh -400F have the small hump because an extended upper floor apparently limits the height of the main floor in the forward cabin area. So what happens if a pax -400 is getting converted? Is the floor getting removed? And if so, is the addditional volume ever getting used? If not, is the second floor just empty or is getting used for handloaded small parcels e.g.?
PC12Fan From United States of America, joined Jan 2007, 2236 posts, RR: 5 Reply 1, posted (1 year 6 months 4 days 12 hours ago) and read 2870 times:
IIRC, about half of the upper deck floor is removed aft of the door. This allows for the 10 foot pallets to fit which obviously wouldn't if the floor was still there. Removing "half" of the floor results in aproximately the same floor space as the standard freighter "hump".
Just when I think you've said the stupidest thing ever, you keep talkin'!
MD11Engineer From Germany, joined Oct 2003, 13336 posts, RR: 64 Reply 2, posted (1 year 6 months 4 days 12 hours ago) and read 2846 times:
Quoting PC12Fan (Reply 1): IIRC, about half of the upper deck floor is removed aft of the door. This allows for the 10 foot pallets to fit which obviously wouldn't if the floor was still there. Removing "half" of the floor results in aproximately the same floor space as the standard freighter "hump".
The area aft of the emergency exits has it´s original floor beams removed and new tension members installed higher up in the frames. This, together with extensive redesigning of the airconditioning plumbing housed in this area, allows to have the main cargo deck ceiling raised further forward to almost the upper deck emergency exits.
vfw614 From Germany, joined Dec 2001, 3592 posts, RR: 5 Reply 3, posted (1 year 6 months 4 days 12 hours ago) and read 2773 times:
So my understanding is that in the hump just hot (or rather cold) air is getting carried around - as no floor exists, it cannot be used for stowage purposes and with beams in the way, nothing can be put on top of the large pallets located on the ground floor?
zanl188 From United States of America, joined Oct 2006, 3248 posts, RR: 0 Reply 4, posted (1 year 6 months 4 days 12 hours ago) and read 2767 times:
Quoting vfw614 (Reply 3): So my understanding is that in the hump just hot (or rather cold) air is getting carried around - as no floor exists, it cannot be used for stowage purposes and with beams in the way, nothing can be put on top of the large pallets located on the ground floor?
Since the upper deck floor has been removed and its associated beams have been moved up and out of the way pallets on the main deck can be built to their maximum height.
MD11Engineer From Germany, joined Oct 2003, 13336 posts, RR: 64 Reply 5, posted (1 year 6 months 4 days 3 hours ago) and read 2542 times:
Quoting vfw614 (Reply 3): So my understanding is that in the hump just hot (or rather cold) air is getting carried around - as no floor exists, it cannot be used for stowage purposes and with beams in the way, nothing can be put on top of the large pallets located on the ground floor?
I´m on vacations now, but when I´m back at work, I´ll take a picture of the inside of a converted 747-400´s hump. There are some walkways for maintenance (e.g. the actuation bottles for the emergency exit doors are located there, which need to be checked during each daily check at our airline), plus plenty of aircon ducts (e.g. upper deck trim air valves, recirculation fans and filters).
Quoting zanl188 (Reply 4): Since the upper deck floor has been removed and its associated beams have been moved up and out of the way pallets on the main deck can be built to their maximum height.
With our Jumbos the main deck cargo hold has linings all the way around.
747classic From Netherlands, joined Aug 2009, 1782 posts, RR: 11 Reply 6, posted (1 year 6 months 3 days 19 hours ago) and read 2368 times:
In all converted 747-400's lining is installed (new regulations.), so it's very difficult to show the actual modification details (tension ties etc.) inside the 747-400BCF or 747-400BDSF aircraft. Almost every modification detail is hidden by white panels.
For that reason a 747-300SF shows the required modification far better, because only partial lining is installed.
Note :
All converted 747-100,-200, -200(SUD) and 300 freighters (by Boeing and others) are mentioned "Special Freighter" ( -SF) and are modified according a Supplemental Type Certificate (STC) and/or Boeing Master Change.
To differentiate the( more expensive) Boeing freighter modifications from the "third party" modifications, Boeing invented a new way to name the P-F converted aircraft :
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