'during loading" is correct and usable in written English.
You can use it to refer to an action that occurs while something is being loaded. For example, "Be sure to check for any loose items during loading."
Most errors happen during loading.
§ 176.108 Supervision of Class 1 (explosive) materials during loading, unloading, handling and stowage.
From the convoy bound for Talbiseh, surgical supplies, burns and midwifery kits and medicines were removed during loading.
Thus, corrosion scale does not fracture during loading.
For such mesas, we measured the forces and shear displacements of the top flake both during loading and unloading.
An arresting mechanism prevents damage during loading by separating the knife-edges from their bearings.
The interface slips during loading and opens up during unloading.
The first one describes a material behaviour during loading path.
If the lumbar lordosis (low back curve) is maintained, during loading, the low back can tolerate enormous loads.
All of it is brought on board through the marshalling area, where the starboard door stands open during loading like a giant famished maw.
It's a nice little extra that sort of reminds me of Fifa's shooting practise sequences that pop in during loading times.
