Once every month.
Prior to each use.
Ensure that personnel and other equipment are clear from the "Line of Fire" in the event of a failure.
Use of safety barriers/shields to protect personnel and equipment should there be a failure.
Both a and b above.
Cracks may compromise the load rating.
Worn paint may compromise the load rating.
Deformation may compromise the load rating.
Both a and c above.
Repaired at a service shop.
Donated to charity.
Immediately tagged and removed from service.
Placed back in its storage area.
Here's an interesting quiz for you.