A manager should be ready to encounter crises like financial crises, technical, staff, electrical, product/ service crises and others.
Each of them will come up, no doubt but it's pertinent to look critically at the reason behind each of the crises and proffer lasting solutions to them.
Again set up some motions in place such which will be able to detect the crises before it occurs.
Be prepared all the time to encounter crises, they will surely occur.