back in the 60's my brother forgot to tighten the lug nuts on a customer's car. . . tire rolled off the vehicle while owner was driving down main street in our little town. My Dad owned a tire and battery shop! ooooh. probably not too good for busines. However, he died a millionaire!
Just for information the wheels on large jets only have 1 large nut holding them to the axle, with 2 small safety bolts.
As I said someone didn't do their job or someone sabotage it. No real reason for them to simply fall off. Now of course, I not planning flying anywhere soon.
On something this critical, there should be a check system in place. First mechanic torques the wheel down, second mechanic double checks the wheel for correct torque, all procedures are noted in a log book.
