I worked as a plane handler and was also a plane captain on 2 different carriers. Padeyes just don't fail, there is a maintenance procedure performed to test if they are good or if they are needing to be replaced once in port (can't remember the maintenance period but seemed like quarterly)and planes typically have at least 6 chains during flight ops unless moving, such as moving to the catapult or after recovery or respot. If I remember correctly 10 chains were used after flight ops secure and in some cases I remember 18 chains being used in rough seas (it has been several years so memory may be a little sketchy), but that's what i remember. The tie down chains have a capacity of 10,000 pounds each. Although I have seen them fail, its not all the chains failing at once. I was on the Midway moving an A6 when it took its historic roll. The plane was just hooked up to the tractor, but it didn't go over the side, but chocks and chains were put on very quickly. Seems the Navy has changed considerably since I was in.