Cal. Rev. & Tax. Code § 5365

Upon request of the assessor of the county in which an aircraft is habitually based, the owner shall file with the assessor a statement setting forth information about the aircraft that is necessary to ascertain the full value of the aircraft, including, but not limited to, the serial number, the make, model, year of manufacture of the aircraft, and engine and maintenance information, including the total hours logged on the aircraft following the last major overhaul of the engine of the aircraft.