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LTU932
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Boeing 777-200F Side Cargo Door Question

Tue Dec 19, 2006 4:29 pm

In all renders Boeing has released of the 777-200F, I noticed that they didn't put the side cargo door on the front side like on MD-11Fs or 727Fs, but on the aft side of the fuse, like on a 747. Here's an example:

http://boeingmedia.com/imageDetail.cfm?id=14681&clr=release

Any assumptions on why Boeing decided to put the SCD on the 777-200F in the rear and not up front near the L1 door? What's the advantage of this?
 
zenarcade
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RE: Boeing 777-200F Side Cargo Door Question

Tue Dec 19, 2006 5:26 pm

Going on a leg here, but maybe its to make sure uneven loading does not occur.

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JMO-777
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RE: Boeing 777-200F Side Cargo Door Question

Tue Dec 19, 2006 5:30 pm

Hi!

I thought there was a "sentence" about that in one of Boeing's pressreleases about the 77F. Sadly, I cannot find that.

But IIRC it has sth to do with accessibility.

GreetZ,
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kc135topboom
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RE: Boeing 777-200F Side Cargo Door Question

Tue Dec 19, 2006 7:20 pm

I know on the B-747F, it is placed behind the wing because of structual issues because of the humped fuselarge forward of the wing.

To me it looks like, on the B-777F, a clearence issue with the engine inlet. It may be so close there could be an issue of cargo handling equipment manuvering, and the possibility of hitting the engine inlet or cowling.
 
RyDawg82
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RE: Boeing 777-200F Side Cargo Door Question

Tue Dec 19, 2006 7:21 pm

Quoting LTU932 (Thread starter):
Any assumptions on why Boeing decided to put the SCD on the 777-200F in the rear and not up front near the L1 door? What's the advantage of this?



Quoting Boeing.com:
The 777 Freighter will be designed to integrate smoothly with existing cargo operations and facilitate interlining with 747 freighter fleets, which comprise about half of the world's freighter capacity. Cargo operators will be able to easily transfer 10-foot-high pallets between the two models via the large main deck cargo door.

I believe the door was located aft to accomplish this (height requirement).

-R

[Edited 2006-12-19 11:25:06]
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OldAeroGuy
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RE: Boeing 777-200F Side Cargo Door Question

Wed Dec 20, 2006 1:27 am

Quoting KC135TopBoom (Reply 3):
To me it looks like, on the B-777F, a clearence issue with the engine inlet.



Quoting Zenarcade (Reply 1):
Going on a leg here, but maybe its to make sure uneven loading does not occur.

These are the two primary reasons, particularly the latter. With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.
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zanl188
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RE: Boeing 777-200F Side Cargo Door Question

Wed Dec 20, 2006 10:47 am

Quoting OldAeroGuy (Reply 5):
With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.

Virtually Impossible? I know some rampers who could do it easy.... I think putting the door aft makes it easier to do it right however, you wouldn't have to push a couple of cans or containers in first before pushing the first one into it's load planned location.
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HAWK21M
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RE: Boeing 777-200F Side Cargo Door Question

Wed Dec 20, 2006 6:32 pm

Quoting OldAeroGuy (Reply 5):
With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.

Pls Elaborate.
regds
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OldAeroGuy
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RE: Boeing 777-200F Side Cargo Door Question

Thu Dec 21, 2006 3:59 am

Quoting HAWK21M (Reply 7):
Quoting OldAeroGuy (Reply 5):
With the door behind the wing, it is virtually impossible to make the airplane sit on its tail due to loading errors.

Pls Elaborate.
regds
MEL

OK. As an example, let's consider a main deck cargo load of 27 96"x125" pallets.

With an aft door, 20 pallets are forward of the door, 2 are aligned with the door and 5 are aft of the door.

Also note that the aft door is not far behind the airplane gear while airplane OEW CG is in front of the main gear.

The natural progression of loading would have the forward pallets loaded first, the aft pallets loaded next and the door aligned pallets loaded last.

Having 20 pallets ahead of the door biases the loading CG to be forward.
Unless the loader loads the aft pallets first and/or the aft pallets are extremely heavy, the CG should always remain ahead of the gear during loading. Aft pallets heavy enough to shift the CG aft of the gear would also probably exceed the pallet and airplane floor load capability.

Note that I said virtually impossible. Willful neglect of a proper loading sequence is always possible.
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