c5load
Posts: 344
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747 Cargo Doors

Sun Feb 01, 2009 5:29 pm

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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Spacepope
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RE: 747 Cargo Doors

Sun Feb 01, 2009 5:39 pm

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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OldAeroGuy
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RE: 747 Cargo Doors

Sun Feb 01, 2009 6:06 pm

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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GARUDAROD
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RE: 747 Cargo Doors

Sun Feb 01, 2009 6:14 pm

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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zanl188
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RE: 747 Cargo Doors

Sun Feb 01, 2009 8:24 pm



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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Viscount724
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RE: 747 Cargo Doors

Mon Feb 02, 2009 4:11 am



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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HAWK21M
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RE: 747 Cargo Doors

Mon Feb 02, 2009 7:13 am

The sequence for loading of these freighters is very critical.....Off load aft loads first & load aft loads last.
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JRadier
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RE: 747 Cargo Doors

Mon Feb 02, 2009 9:54 pm



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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