7. Operations.
a. Types and Authority. Current FAA policy for UAS operations is that no person may operate a
UAS in the NAS without specific authority.
(3) Hobbyist.
(a) Hobbyists should follow the guidance contained in Advisory Circular (AC) 91-57.
(b) For model aircraft, the authority is AC 91-57.

12. Definitions.
n. Hobby – model aircraft used for sport and recreation only.

13. Word usage.
a. May (need not be followed by a verb) means a procedure is optional.
b. Must (followed by a verb or the use of an appropriate action verb in the imperative sense) means
a procedure is mandatory.
c. Should (followed by a verb) means a procedure is recommended.