Part 21 - Certification Procedures for Products and Articles

Part 23 - Airworthiness Standards: Normal Category Airplanes

Part 25 - Airworthiness Standards: Transport Category Airplanes

Part 26 - Continued Airworthiness and Safety Improvements for Transport Category Airplanes

Part 27 - Airworthiness Standards: Normal Category Rotorcraft

Part 29 - Airworthiness Standards: Transport Category Rotorcraft

Part 31 - Airworthiness Standards: Manned Free Balloons

Part 33 - Airworthiness Standards: Aircraft Engines

Part 34 - Fuel Venting and Exhaust Emission Requirements for Turbine Engine Powered Airplanes

Part 35 - Airworthiness Standards: Propellers

Part 36 - Noise Standards: Aircraft Type and Airworthiness Certification

Part 39 - Airworthiness Directives

Part 43 - Maintenance, Preventive Maintenance, Rebuilding, and Alteration

Part 45 - Identification and Registration Marking

Part 47 - Aircraft Registration

Part 48 - Registration and Marking Requirements for Small Unmanned Aircraft

Part 49 - Recording of Aircraft Titles and Security Documents

Part 38 - Airplane Fuel Efficiency Certification

Parts 50--59 - [Reserved]