U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 14Chapter IPart 25Subpart E - Subpart E—Powerplant

GENERAL
§ 25.901 - Installation.
§ 25.903 - Engines.
§ 25.904 - Automatic takeoff thrust control system (ATTCS).
§ 25.905 - Propellers.
§ 25.907 - Propeller vibration and fatigue.
§ 25.925 - Propeller clearance.
§ 25.929 - Propeller deicing.
§ 25.933 - Reversing systems.
§ 25.934 - Turbojet engine thrust reverser system tests.
§ 25.937 - Turbopropeller-drag limiting systems.
§ 25.939 - Turbine engine operating characteristics.
§ 25.941 - Inlet, engine, and exhaust compatibility.
§ 25.943 - Negative acceleration.
§ 25.945 - Thrust or power augmentation system.

FUEL SYSTEM
§ 25.951 - General.
§ 25.952 - Fuel system analysis and test.
§ 25.953 - Fuel system independence.
§ 25.954 - Fuel system lightning protection.
§ 25.955 - Fuel flow.
§ 25.957 - Flow between interconnected tanks.
§ 25.959 - Unusable fuel supply.
§ 25.961 - Fuel system hot weather operation.
§ 25.963 - Fuel tanks: general.
§ 25.965 - Fuel tank tests.
§ 25.967 - Fuel tank installations.
§ 25.969 - Fuel tank expansion space.
§ 25.971 - Fuel tank sump.
§ 25.973 - Fuel tank filler connection.
§ 25.975 - Fuel tank vents and carburetor vapor vents.
§ 25.977 - Fuel tank outlet.
§ 25.979 - Pressure fueling system.
§ 25.981 - Fuel tank explosion prevention.

FUEL SYSTEM COMPONENTS
§ 25.991 - Fuel pumps.
§ 25.993 - Fuel system lines and fittings.
§ 25.994 - Fuel system components.
§ 25.995 - Fuel valves.
§ 25.997 - Fuel strainer or filter.
§ 25.999 - Fuel system drains.
§ 25.1001 - Fuel jettisoning system.

OIL SYSTEM
§ 25.1011 - General.
§ 25.1013 - Oil tanks.
§ 25.1015 - Oil tank tests.
§ 25.1017 - Oil lines and fittings.
§ 25.1019 - Oil strainer or filter.
§ 25.1021 - Oil system drains.
§ 25.1023 - Oil radiators.
§ 25.1025 - Oil valves.
§ 25.1027 - Propeller feathering system.

COOLING
§ 25.1041 - General.
§ 25.1043 - Cooling tests.
§ 25.1045 - Cooling test procedures.

INDUCTION SYSTEM
§ 25.1091 - Air induction.
§ 25.1093 - Induction system icing protection.
§ 25.1101 - Carburetor air preheater design.
§ 25.1103 - Induction system ducts and air duct systems.
§ 25.1105 - Induction system screens.
§ 25.1107 - Inter-coolers and after-coolers.

EXHAUST SYSTEM
§ 25.1121 - General.
§ 25.1123 - Exhaust piping.
§ 25.1125 - Exhaust heat exchangers.
§ 25.1127 - Exhaust driven turbo-superchargers.

POWERPLANT CONTROLS AND ACCESSORIES
§ 25.1141 - Powerplant controls: general.
§ 25.1142 - Auxiliary power unit controls.
§ 25.1143 - Engine controls.
§ 25.1145 - Ignition switches.
§ 25.1147 - Mixture controls.
§ 25.1149 - Propeller speed and pitch controls.
§ 25.1153 - Propeller feathering controls.
§ 25.1155 - Reverse thrust and propeller pitch settings below the flight regime.
§ 25.1157 - Carburetor air temperature controls.
§ 25.1159 - Supercharger controls.
§ 25.1161 - Fuel jettisoning system controls.
§ 25.1163 - Powerplant accessories.
§ 25.1165 - Engine ignition systems.
§ 25.1167 - Accessory gearboxes.

POWERPLANT FIRE PROTECTION
§ 25.1181 - Designated fire zones; regions included.
§ 25.1182 - Nacelle areas behind firewalls, and engine pod attaching structures containing flammable fluid lines.
§ 25.1183 - Flammable fluid-carrying components.
§ 25.1185 - Flammable fluids.
§ 25.1187 - Drainage and ventilation of fire zones.
§ 25.1189 - Shutoff means.
§ 25.1191 - Firewalls.
§ 25.1192 - Engine accessory section diaphragm.
§ 25.1193 - Cowling and nacelle skin.
§ 25.1195 - Fire extinguishing systems.
§ 25.1197 - Fire extinguishing agents.
§ 25.1199 - Extinguishing agent containers.
§ 25.1201 - Fire extinguishing system materials.
§ 25.1203 - Fire detector system.
§ 25.1207 - Compliance.
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