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747 Cargo Doors  
User currently offlineC5LOAD From United States of America, joined Sep 2008, 917 posts, RR: 0
Posted (5 years 6 months 3 weeks 10 hours ago) and read 4812 times:

Hello A.netters If this has been posted previously, forgive me. The other day I was watching an Evergreen 747-200 being loaded next to a FedEx MD-11. I got to wondering why there are no large cargo doors forward of the wings on the side of the 747 like they are on most other cargo a/c. Wouldn't that help alleviate some problems like trying to get around the wing like in the aft part, or help by simultaneously loading through the front and aft sections. Any ideas?


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7 replies: All unread, jump to last
 
User currently offlineSpacepope From Vatican City, joined Dec 1999, 2914 posts, RR: 1
Reply 1, posted (5 years 6 months 3 weeks 10 hours ago) and read 4782 times:

The area under the upper deck is much lower than the rest of the fuselage. A SCD forward of the wing would mean you couldn't load full height pallets. That;s why the pure freighters have a nose door (for long things) and the SCD (for big things).


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User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3499 posts, RR: 66
Reply 2, posted (5 years 6 months 3 weeks 10 hours ago) and read 4712 times:

The 777F main deck cargo door is aft of the wing. This is a better location for minimizing loader - airplane interference and helps to ensure the airplane will not tip on its tail during loading.


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User currently offlineGARUDAROD From United States of America, joined Apr 2000, 1516 posts, RR: 1
Reply 3, posted (5 years 6 months 3 weeks 10 hours ago) and read 4689 times:

There are generally two types of B747 Freighters, those that were manufactured as a Freighter or Convertible and those that were converted from passenger aircraft into a Freighter.
The purpose built freighters, except for a few aircraft, have both an opening Nose door and a side loading cargo door. The nose loading door will allow pallets upto 96" high to loaded through it, while the SCD will allow pallets upto 120" high to be loaded. Each pallet through the SCD has to be contoured to fit the side walls of the aircraft, the 120" will face the middle of the aircraft. There are approximately 6 or 8 pallets that have to be restricted to 96" high to fit under the Hump/Cockpit area of the aircraft. Freighters are often load/unload through both the nose and the SCD. Converted Freighters only load through the SCD.



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User currently offlineZANL188 From United States of America, joined Oct 2006, 3516 posts, RR: 0
Reply 4, posted (5 years 6 months 3 weeks 7 hours ago) and read 4592 times:
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Quoting C5LOAD (Thread starter):
Wouldn't that help alleviate some problems like trying to get around the wing like in the aft part, or help by simultaneously loading through the front and aft sections.

Actually getting a loader into the rear door on 747 isn't as hard as it looks. The only loader I've ever seen have a problem is the 60K-loaders USAF uses - has to be lined up just so or it comes in contact with the flap fairings when the deck is raised, this is due to the length of the loader.....



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User currently onlineViscount724 From Switzerland, joined Oct 2006, 25106 posts, RR: 22
Reply 5, posted (5 years 6 months 3 weeks ago) and read 4507 times:



Quoting OldAeroGuy (Reply 2):
The 777F main deck cargo door is aft of the wing. This is a better location for minimizing loader - airplane interference and helps to ensure the airplane will not tip on its tail during loading.

The 5 MD-11C combis built for AZ (the only ones built) also have the main deck cargo door aft of the wing. On the.MD-11F freighter it's in front of the wing.


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User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 6, posted (5 years 6 months 2 weeks 6 days 21 hours ago) and read 4473 times:

The sequence for loading of these freighters is very critical.....Off load aft loads first & load aft loads last.
regds
MEL.



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User currently offlineJRadier From Netherlands, joined Sep 2004, 4676 posts, RR: 50
Reply 7, posted (5 years 6 months 2 weeks 6 days 6 hours ago) and read 4356 times:



Quoting Viscount724 (Reply 5):

The 5 MD-11C combis built for AZ (the only ones built) also have the main deck cargo door aft of the wing. On the.MD-11F freighter it's in front of the wing.

The MD-11CF (Convertible) as ordered by MP has the cargo door in front of the wing as well.



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