LD-3 containers are a little bit larger than LD-2 containers (=more floor space and more volume).
When you load an A300 or A310 (or any other widebody aircraft), you have a right hand side position and a left hand side position for these containers, e.g. 31L, 32L, 31R, 32R etc.....
It is the same for a 767 with LD-2 containers,
BUT when you load an LD-3 container into a 767 lower hold, that container has to be placed onto the "LEFT" positions and the side with the slope (the "overhang")faces towards the "RIGHT" side (where your cargo door is)so that the weight is more or less equally distributed.
All 767s I know have built-in additional guidance locks just for that purpose, and these guidance locks (probably the wrong term!?) have to be set upright before loading.
And because of the size of these LD-3s, you cannot load two of them next to each other (left and right simultaneously), only one after the other in a row.
The 763 can accomodate 4 pallets in the forward hold, each one is locked individually, and for the smaller 88inch pallets (PAC-pallets) a built-in guidance rail has to be placed upright before loading. These pallets have to be loaded in the long run, similar to DHL´s Convair 580s.
BTW, two LD-2s fit next to each other into the A300/310/DC-10....when you load them with the slope towards the centerline!!!
I hope I could answer your question, at least partially....
thank you very much for your answer.
I handle DL 763s, DE 763s and did handle Britannia (Germany) 763s, and I noticed, especially at DL`s 763s, newer ones, that when you start loading at Position 31L&R (DL has only numbers, 1 - 16 forward, 17 - 30 aft, but NOT Left and Right) and when you lock these containers immediately, the next position(32L&R) cannot be locked anymore and the next one (33L&R) also not.....
On the other hand, if you have a completely empty aft hold (for example), and you want to place a container onto let`s say 33R, the locks will prevent that container from moving towards the REAR, but NOT towards the front!!!!!!
So you always must begin loading at position 31..... Now I would like to know WHY it has been designed that way????
If you look into an A300/310, etc...
they have locks that look like a "T" when placed upright, and they prevent every container individually from moving into any direction.
BTW, you can load LD-2s onto any given position, there are no "pallet only" positions, at least not with DL.
Sorry for my awful English,