StacksVerified U.S. regulatory reference

Part 21 — Certification Procedures for Products and Articles

Subpart A — General

Subpart B — Type Certificates

Subpart C — Provisional Type Certificates

Subpart D — Changes to Type Certificates

Subpart E — Supplemental Type Certificates

Subpart F — Production Under Type Certificate

Subpart G — Production Certificates

Subpart H — Airworthiness Certificates

Subpart I — Provisional Airworthiness Certificates

Subpart K — Parts Manufacturer Approvals

Subpart L — Export Airworthiness Approvals

Subpart N — Acceptance of Aircraft Engines, Propellers, and Articles for Import

Subpart O — Technical Standard Order Approvals

Subpart P — Special Federal Aviation Regulations