Federal Aviation Regulations

Part 21: Certification procedures for products and parts

Special Federal Aviation Regulations

• SFAR No. 88 - Fuel Tank System Fault Tolerance Evaluation Requirements

Federal Aviation Regulations

Subpart A - General


• Sec. 21.1 - Applicability.
• Sec. 21.2 - Falsification of applications, reports, or records.
• Sec. 21.3 - Reporting of failures, malfunctions, and defects.
• Sec. 21.5 - Airplane or Rotorcraft Flight Manual.

Subpart B - Type Certificates



• Sec. 21.11 - Applicability.
• Sec. 21.13 - Eligibility.
• Sec. 21.15 - Application for type certificate.
• Sec. 21.16 - Special conditions.
• Sec. 21.17 - Designation of applicable regulations.
• Sec. 21.19 - Changes requiring a new type certificate.
• Sec. 21.21 - Issue of type certificate: normal, utility, acrobatic, commuter, and transport category aircraft; manned free balloons; special classes of aircraft; aircraft engines; propellers.
• Sec. 21.23 - [Reserved]
• Sec. 21.24 - Issuance of type certificate: primary category aircraft.
• Sec. 21.25 - Issue of type certificate: Restricted category aircraft.
• Sec. 21.27 - Issue of type certificate: surplus aircraft of the Armed Forces.
• Sec. 21.29 - Issue of type certificate: import products.
• Sec. 21.31 - Type design.
• Sec. 21.33 - Inspection and tests.
• Sec. 21.35 - Flight tests.
• Sec. 21.37 - Flight test pilot.
• Sec. 21.39 - Flight test instrument calibration and correction report.
• Sec. 21.41 - Type certificate.
• Sec. 21.43 - Location of manufacturing facilities.
• Sec. 21.45 - Privileges.
• Sec. 21.47 - Transferability.
• Sec. 21.49 - Availability.
• Sec. 21.50 - Instructions for continued airworthiness and manufacturer's maintenance manuals having airworthiness limitations sections.
• Sec. 21.51 - Duration.
• Sec. 21.53 - Statement of conformity.

Subpart C - Provisional Type Certificates



• Sec. 21.71 - Applicability.
• Sec. 21.73 - Eligibility.
• Sec. 21.75 - Application.
• Sec. 21.77 - Duration.
• Sec. 21.79 - Transferability.
• Sec. 21.81 - Requirements for issue and amendment of Class I provisional type certificates.
• Sec. 21.83 - Requirements for issue and amendment of Class II provisional type certificates.
• Sec. 21.85 - Provisional amendments to type certificates.

Subpart D - Changes to Type Certificates



• Sec. 21.91 - Applicability.
• Sec. 21.93 - Classification of changes in type design.
• Sec. 21.95 - Approval of minor changes in type design.
• Sec. 21.97 - Approval of major changes in type design.
• Sec. 21.99 - Required design changes.
• Sec. 21.101 - Designation of applicable regulations.

Subpart E - Supplemental Type Certificates



• Sec. 21.111 - Applicability.
• Sec. 21.113 - Requirement of supplemental type certificate.
• Sec. 21.115 - Applicable requirements.
• Sec. 21.117 - Issue of supplemental type certificates.
• Sec. 21.119 - Privileges.

Subpart F - Production Under Type Certificate Only



• Sec. 21.121 - Applicability.
• Sec. 21.123 - Production under type certificate.
• Sec. 21.125 - Production inspection system: Materials Review Board.
• Sec. 21.127 - Tests: aircraft.
• Sec. 21.128 - Tests: aircraft engines.
• Sec. 21.129 - Tests: propellers.
• Sec. 21.130 - Statement of conformity.

Subpart G - Production Certificates



• Sec. 21.131 - Applicability.
• Sec. 21.133 - Eligibility.
• Sec. 21.135 - Requirements for issuance.
• Sec. 21.137 - Location of manufacturing facilities.
• Sec. 21.139 - Quality control.
• Sec. 21.143 - Quality control data requirements; prime manufacturer.
• Sec. 21.147 - Changes in quality control system.
• Sec. 21.149 - Multiple products.
• Sec. 21.151 - Production limitation record.
• Sec. 21.153 - Amendment of the production certificates.
• Sec. 21.155 - Transferability.
• Sec. 21.157 - Inspections and tests.
• Sec. 21.159 - Duration.
• Sec. 21.161 - Display.
• Sec. 21.163 - Privileges.
• Sec. 21.165 - Responsibility of holder.

Subpart H - Airworthiness Certificates



• Sec. 21.171 - Applicability.
• Sec. 21.173 - Eligibility.
• Sec. 21.175 - Airworthiness certificates: classification.
• Sec. 21.177 - Amendment or modification.
• Sec. 21.179 - Transferability.
• Sec. 21.181 - Duration.
• Sec. 21.182 - Aircraft identification.
• Sec. 21.183 - 21
• Sec. 21.184 - Issue of special airworthiness certificates for primary category aircraft.
• Sec. 21.185 - Issue of airworthiness certificates for restricted category aircraft.
• Sec. 21.187 - Issue of multiple airworthiness certification.
• Sec. 21.189 - Issue of airworthiness certificate for limited category aircraft.
• Sec. 21.191 - Experimental certificates.
• Sec. 21.193 - Experimental certificates: general.
• Sec. 21.195 - Experimental certificates: Aircraft to be used for market surveys, sales demonstrations, and customer crew training.
• Sec. 21.197 - Special flight permits.
• Sec. 21.199 - Issue of special flight permits.

Subpart I - Provisional Airworthiness Certificates



• Sec. 21.211 - Applicability.
• Sec. 21.213 - Eligibility.
• Sec. 21.215 - Application.
• Sec. 21.217 - Duration.
• Sec. 21.219 - Transferability.
• Sec. 21.221 - Class I provisional airworthiness certificates.
• Sec. 21.223 - Class II provisional airworthiness certificates.
• Sec. 21.225 - Provisional airworthiness certificates corresponding with provisional amendments to type certificates.

Subpart J - Delegation Option Authorization Procedures



• Sec. 21.231 - Applicability.
• Sec. 21.235 - Application.
• Sec. 21.239 - Eligibility.
• Sec. 21.243 - Duration.
• Sec. 21.245 - Maintenance of eligibility.
• Sec. 21.247 - Transferability.
• Sec. 21.249 - Inspections.
• Sec. 21.251 - Limits of applicability.
• Sec. 21.253 - Type certificates: application.
• Sec. 21.257 - Type certificates: issue.
• Sec. 21.261 - Equivalent safety provisions.
• Sec. 21.267 - Production certificates.
• Sec. 21.269 - Export airworthiness approvals.
• Sec. 21.271 - Airworthiness approval tags.
• Sec. 21.273 - Airworthiness certificates other than experimental.
• Sec. 21.275 - Experimental certificates.
• Sec. 21.277 - Data review and service experience.
• Sec. 21.289 - Major repairs, rebuilding and alteration.
• Sec. 21.293 - Current records.

Subpart K - Approval of Materials, Parts, Processes, and Appliances



• Sec. 21.301 - Applicability.
• Sec. 21.303 - Replacement and modification parts.
• Sec. 21.305 - Approval of materials, parts, processes, and appliances.

Subpart L - Export Airworthiness Approvals



• Sec. 21.321 - Applicability.
• Sec. 21.323 - Eligibility.
• Sec. 21.325 - Export airworthiness approvals.
• Sec. 21.327 - Application.
• Sec. 21.329 - Issue of export certificates of airworthiness for Class I products.
• Sec. 21.331 - Issue of airworthiness approval tags for Class II products.
• Sec. 21.333 - Issue of export airworthiness approval tags for Class III products.
• Sec. 21.335 - Responsibilities of exporters.
• Sec. 21.337 - Performance of inspections and overhauls.
• Sec. 21.339 - Special export airworthiness approval for aircraft.

Subpart M - Designated Alteration Station Authorization Procedures



• Sec. 21.431 - Applicability.
• Sec. 21.435 - Application.
• Sec. 21.439 - Eligibility.
• Sec. 21.441 - Procedure manual.
• Sec. 21.443 - Duration.
• Sec. 21.445 - Maintenance of eligibility.
• Sec. 21.447 - Transferability.
• Sec. 21.449 - Inspections.
• Sec. 21.451 - Limits of applicability.
• Sec. 21.461 - Equivalent safety provisions.
• Sec. 21.463 - Supplemental type certificates.
• Sec. 21.473 - Airworthiness certificates other than experimental.
• Sec. 21.475 - Experimental certificates.
• Sec. 21.477 - Data review and service experience.
• Sec. 21.493 - Current records.

Subpart N - Approval of Engines, Propellers, Materials, Parts, and Appliances: Import



• Sec. 21.500 - Approval of engines and propellers.
• Sec. 21.502 - Approval of materials, parts, and appliances.

Subpart O - Technical Standard Order Authorizations



• Sec. 21.601 - Applicability.
• Sec. 21.603 - TSO marking and privileges.
• Sec. 21.605 - Application and issue.
• Sec. 21.607 - General rules governing holders of TSO authorizations.
• Sec. 21.609 - Approval for deviation.
• Sec. 21.611 - Design changes.
• Sec. 21.613 - Recordkeeping requirements.
• Sec. 21.615 - FAA inspection.
• Sec. 21.617 - Issue of letters of TSO design approval: import appliances.
• Sec. 21.619 - Noncompliance.
• Sec. 21.621 - Transferability and duration.