Federal Aviation Regulations

Part 33: Airworthiness standards: Aircraft engines

Federal Aviation Regulations

Subpart A - General


• Sec. 33.1 - Applicability.
• Sec. 33.3 - General.
• Sec. 33.4 - Instructions for Continued Airworthiness.
• Sec. 33.5 - Instruction manual for installing and operating the engine.
• Sec. 33.7 - Engine ratings and operating limitations.
• Sec. 33.8 - Selection of engine power and thrust ratings.

Subpart B - Design and Construction; General



• Sec. 33.11 - Applicability.
• Sec. 33.13 - [Reserved]
• Sec. 33.14 - Start-stop cyclic stress (low-cycle fatigue).
• Sec. 33.15 - Materials.
• Sec. 33.17 - Fire prevention.
• Sec. 33.19 - Durability.
• Sec. 33.21 - Engine cooling.
• Sec. 33.23 - Engine mounting attachments and structure.
• Sec. 33.25 - Accessory attachments.
• Sec. 33.27 - Turbine, compressor, fan, and turbosupercharger rotors.
• Sec. 33.28 - Electrical and electronic engine control systems.
• Sec. 33.29 - Instrument connection.

Subpart C - Design and Construction; Reciprocating Aircraft Engines



• Sec. 33.31 - Applicability.
• Sec. 33.33 - Vibration.
• Sec. 33.35 - Fuel and induction system.
• Sec. 33.37 - Ignition system.
• Sec. 33.39 - Lubrication system.

Subpart D - Block Tests; Reciprocating Aircraft Engines



• Sec. 33.41 - Applicability.
• Sec. 33.42 - General.
• Sec. 33.43 - Vibration test.
• Sec. 33.45 - Calibration tests.
• Sec. 33.47 - Detonation test.
• Sec. 33.49 - Endurance test.
• Sec. 33.51 - Operation test.
• Sec. 33.53 - Engine component tests.
• Sec. 33.55 - Teardown inspection.
• Sec. 33.57 - General conduct of block tests.

Subpart E - Design and Construction; Turbine Aircraft Engines



• Sec. 33.61 - Applicability.
• Sec. 33.62 - Stress analysis.
• Sec. 33.63 - Vibration.
• Sec. 33.65 - Surge and stall characteristics.
• Sec. 33.66 - Bleed air system.
• Sec. 33.67 - Fuel system.
• Sec. 33.68 - Induction system icing.
• Sec. 33.69 - Ignitions system.
• Sec. 33.71 - Lubrication system.
• Sec. 33.72 - Hydraulic actuating systems.
• Sec. 33.73 - Power or thrust response.
• Sec. 33.74 - Continued rotation.
• Sec. 33.75 - Safety analysis.
• Sec. 33.76 - Bird ingestion.
• Sec. 33.77 - Foreign object ingestion -- ice.
• Sec. 33.78 - Rain and hail ingestion.
• Sec. 33.79 - Fuel burning thrust augmentor.

Subpart F - Block Tests; Turbine Aircraft Engines



• Sec. 33.81 - Applicability.
• Sec. 33.82 - General.
• Sec. 33.83 - Vibration test.
• Sec. 33.85 - Calibration tests.
• Sec. 33.87 - Endurance test.
• Sec. 33.88 - Engine overtemperature test.
• Sec. 33.89 - Operation test.
• Sec. 33.90 - Initial maintenance inspection.
• Sec. 33.91 - Engine component tests.
• Sec. 33.92 - Rotor locking tests.
• Sec. 33.93 - Teardown inspection.
• Sec. 33.94 - Blade containment and rotor unbalance tests.
• Sec. 33.95 - Engine-propeller systems tests.
• Sec. 33.96 - Engine tests in auxiliary power unit (APU) mode.
• Sec. 33.97 - Thrust reversers.
• Sec. 33.99 - General conduct of block tests.

Appendices

• Appendix A to Part 33 - Instructions for Continued Airworthiness
• Appendix B to Part 33 - Certification Standard Atmospheric Concentrations of Rain and Hail