Cal. LAB § 7304

(a) Except as provided in subdivision (b), the division shall cause all conveyances to be inspected at least once each year. If a conveyance is found upon inspection to be in a safe condition for operation, a permit for operation for not longer than one year shall be issued by the division. (b) If a conveyance is subject to a full maintenance service contract, the division may, after investigation and inspection, issue a permit for operation for not longer than two years.