As already stated Human Factors are the main root causes of Aircraft Damage.
Fatigue, Lack of Training, Lack of Experience, Strict OTP issues, Catering/Fuelling/Loading all being undertaken on Stbd side of the Aircraft, Environmental Conditions, GSE Serviceability and Maintence procedures being adhered to, the correct GSE being used for the task.
These are all "Hidden" and "Open" reasons for A/C damage.
If you require any further statistical information you can PM me as I am all too familiar with Aircraft damage investigation
