Actually the nose strap that secured the 747 to the deck broke during loading and that's what caused the nose to pitch up.
About 15 years ago there was a DC-10 at LAX that did have the load shift during cargo onloading.
They were loading some heavy stuff, it was going forward.
The load planner had planned for the heavy stuff to go all the way forward, get locked down, and then the rest of the cargo to be loaded.
The guys loading outside of the aircraft lost communications with the guys inside, the guys inside didn't have the cargo locked down, when the outside team brought on the next cargo load the tail went down enough to allow the forward cargo to start moving aft.
The forward cargo loading team was not able to stop the cargo, when the cargo passed over the aircraft's CG it started to lift the nose up until the cargo hit the ramp and the nose was something like 20 feet in the air.
It took them 10 hours to offload the cargo by hand enough to get the DC-10 back into CG limits to allow a sling crane to lower the nose back to the deck.
Quoted: That 747 there is on the grass,CG shifted aft. When I worked at DHL at CVG,we had DC-8s and 727-200s,both of which had to be loaded with a heavy can parked forward of the main cargo door.That,plus a heavy ass tailstand would keep DC-8s from sitting on their ass,while 727s had the rear airstair down.
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