14 CFR § 137.21 - Duration of certificate.

---
identifier: "/us/cfr/t14/s137.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 137.21 - Duration of certificate."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "137.21"
section_name: "Duration of certificate."
chapter_name: "FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "G"
subchapter_name: "AIR CARRIERS AND OPERATORS FOR COMPENSATION OR HIRE: CERTIFICATION AND OPERATIONS"
part_number: "137"
part_name: "AGRICULTURAL AIRCRAFT OPERATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 106(g), 40103, 40113, 44701-44702."
regulatory_source: "Docket 1464, 30 FR 8106, June 24, 1965, unless otherwise noted."
cfr_part: "137"
---


# 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.