Originally Posted by
ani90
If a safety issue as stated why charge more to allow a heavier bag through? If 70 lb was at the limit and a hard red line above which baggage cannot be processed, then that should be absolute as opposed to charging a fee for a heavier bag.
It's not a hard red line. But it is a line above which they need different handling, and want to discourage.
NIOSH has a lifting equation for calculating a recommended weight limit
for one person under different conditions. The lifting equation establishes a maximum load of 51 pounds, which is then adjusted to account for how often you are lifting, twisting of your back during lifting, the vertical distance the load is lifted, the distance of the load from your body, the distance you move while lifting the load, and how easy it is to hold onto the load.