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Boeing 777-200F Side Cargo Door Question  
User currently offlineLTU932 From Germany, joined Jan 2006, 13864 posts, RR: 50
Posted (7 years 8 months 1 week 5 days 16 hours ago) and read 8891 times:

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?

8 replies: All unread, jump to last
 
User currently offlineZenarcade From Canada, joined Nov 2006, 85 posts, RR: 0
Reply 1, posted (7 years 8 months 1 week 5 days 15 hours ago) and read 8883 times:

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

Adam



If a plane falls on the tarmac and no one is there, does it make any sound? - Starlionblue
User currently offlineJMO-777 From Germany, joined Apr 2002, 501 posts, RR: 17
Reply 2, posted (7 years 8 months 1 week 5 days 15 hours ago) and read 8880 times:

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,
Jan



~~~ Fly with a Triple Seven and you feel like in heaven ~~~
User currently offlineKC135TopBoom From United States of America, joined Jan 2005, 12135 posts, RR: 51
Reply 3, posted (7 years 8 months 1 week 5 days 13 hours ago) and read 8851 times:

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.


User currently offlineRyDawg82 From United States of America, joined Sep 2001, 861 posts, RR: 8
Reply 4, posted (7 years 8 months 1 week 5 days 13 hours ago) and read 8851 times:

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]


You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3501 posts, RR: 66
Reply 5, posted (7 years 8 months 1 week 5 days 7 hours ago) and read 8797 times:

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.



Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
User currently offlineZANL188 From United States of America, joined Oct 2006, 3518 posts, RR: 0
Reply 6, posted (7 years 8 months 1 week 4 days 22 hours ago) and read 8724 times:
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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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User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 7, posted (7 years 8 months 1 week 4 days 14 hours ago) and read 8684 times:

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



Think of the brighter side!
User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3501 posts, RR: 66
Reply 8, posted (7 years 8 months 1 week 4 days 5 hours ago) and read 8657 times:

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.



Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
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