A mechanic with an airframe rating may approve and return to service an airframe, appliance, or related part after he or she has performed, supervised, or inspected ____________ repairs or alterations. (13-5) 11.A mechanic with both ratings may apply for ___________ _________if he or she has held the certificate for at least three years and been active for the last two years. (13-5) 12.________is the study of standards of conduct and moral judgment. (13-7)