Something to add to my previous posting:
Having 10 years experience on this a/c type I do not believe that only a hard or bounced landing even if it is excessive will cause 3 pod strikes on a B744.
For the Manchester incident I assume an unwanted bank angle due to crosswind and gust conditions (maybe similar to the LH incident in HAM) leading to pod strike on the one wing followed by overreaction banking to opposite direction, maybe in combination with a hard landing.
However, it’s just my assumption rather than to blame anyone.