---
kind: "unit"
title: "14"
title_heading: "Aeronautics and Space"
key: "chI/subchC/part21"
level: "part"
label: "Part 21"
heading: "Certification Procedures for Products and Articles"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/14/chI-subchC-part21"
sections_count: 143
---

# Part 21 — Certification Procedures for Products and Articles

Title 14 C.F.R. — Aeronautics and Space › Chapter I — Federal Aviation Administration, Department of Transportation › Subchapter C — Aircraft

## Contents

- [Subpart A — General](/cfr/14/chI-subchC-part21-subpartA.md)
- [Subpart B — Type Certificates](/cfr/14/chI-subchC-part21-subpartB.md)
- [Subpart C — Provisional Type Certificates](/cfr/14/chI-subchC-part21-subpartC.md)
- [Subpart D — Changes to Type Certificates](/cfr/14/chI-subchC-part21-subpartD.md)
- [Subpart E — Supplemental Type Certificates](/cfr/14/chI-subchC-part21-subpartE.md)
- [Subpart F — Production Under Type Certificate](/cfr/14/chI-subchC-part21-subpartF.md)
- [Subpart G — Production Certificates](/cfr/14/chI-subchC-part21-subpartG.md)
- [Subpart H — Airworthiness Certificates](/cfr/14/chI-subchC-part21-subpartH.md)
- [Subpart I — Provisional Airworthiness Certificates](/cfr/14/chI-subchC-part21-subpartI.md)
- [Subpart J — Subpart J [Reserved]](/cfr/14/chI-subchC-part21-subpartJ.md)
- [Subpart K — Parts Manufacturer Approvals](/cfr/14/chI-subchC-part21-subpartK.md)
- [Subpart L — Export Airworthiness Approvals](/cfr/14/chI-subchC-part21-subpartL.md)
- [Subpart M — Subpart M [Reserved]](/cfr/14/chI-subchC-part21-subpartM.md)
- [Subpart N — Acceptance of Aircraft Engines, Propellers, and Articles for Import](/cfr/14/chI-subchC-part21-subpartN.md)
- [Subpart O — Technical Standard Order Approvals](/cfr/14/chI-subchC-part21-subpartO.md)
- [Subpart P — Special Federal Aviation Regulations](/cfr/14/chI-subchC-part21-subpartP.md)