What must be done to approve an aircraft for return to service according to 14 CFR 43.5?
a) A detailed report must be submitted to the FAA for review
b) The aircraft must undergo a thorough inspection by an FAA-certified mechanic
c) An entry must be made in the aircraft maintenance records specifying the work performed and indicating the approval for return to service
d) The aircraft must pass a series of flight tests conducted by an FAA inspector