Engine Inspection (1) Airworthiness Directives are Federal Aviation Regulations and must be complied with unless specific exemption is granted. (2) Airworthiness Directives of an emergency nature may require immediate compliance upon receipt. Regarding the above statements, a. only No. 1 is true. b. only No. 2 is true. c. both No. 1 and No. 2 are true.