When an A&P, iA does (ie. completes) an annual inspection, he either certifies he found the aircraft in an airworthy condition, or that he found unairworthy discrepancies, a list of which, he provided the owner. The annual inspection is done, complete, and good for one year whether the aircraft is airworthy or not. Before an aircraft is flown however, the pilot/owner/operator has to determine if the aircraft is airworthy. If there are airworthiness concerns, whether found during a preflight or by an A&P IA in the course of completing an annual, they need to be addressed. if you were going flying and found the tires flat, you'd have to fix them. The annual inspection is the FAA requiring another set of eyes to check over the airplane and ensure it conforms to its type certificate or properly altered condition and is in a safe condition to fly.