14 C.F.R. § 137.21 Duration of certificate.
Title 14 - Aeronautics and Space
An agricultural aircraft operator certificate is effective until it is surrendered, suspended, or revoked. The holder of an agricultural aircraft operator certificate that is suspended or revoked shall return it to the Administrator.
Title 14: Aeronautics and Space
PART 137—AGRICULTURAL AIRCRAFT OPERATIONS
Subpart B—Certification Rules
§ 137.21 Duration of certificate.
