Regulations last checked for updates: Jun 14, 2025

Title 14 - Aeronautics and Space last revised: May 07, 2025
All TitlesTitle 14Chapter IPart 137Subpart B - Subpart B—Certification Rules
View all text of Subpart B [§ 137.11 - § 137.23]
§ 137.21 - Duration of certificate.

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.

authority: 49 U.S.C. 106(g), 40103, 40113, 44701-44702
source: Docket 1464, 30 FR 8106, June 24, 1965, unless otherwise noted.
cite as: 14 CFR 137.21
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