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Title 14

Displaying title 14, up to date as of 7/09/2026. Title 14 was last amended 7/06/2026.
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Title 14Aeronautics and SpacePart / Section
Chapter IFederal Aviation Administration, Department of Transportation1 – 199
Subchapter CAircraft21 – 59
Part 25Airworthiness Standards: Transport Category Airplanes25.1 – 25.1801
Subpart EPowerplant25.901 – 25.1207
General25.901 – 25.945
§ 25.901Installation.
§ 25.903Engines.
§ 25.904Automatic takeoff thrust control system (ATTCS).
§ 25.905Propellers.
§ 25.907Propeller vibration and fatigue.
§ 25.925Propeller clearance.
§ 25.929Propeller deicing.
§ 25.933Reversing systems.
§ 25.934Turbojet engine thrust reverser system tests.
§ 25.937Turbopropeller-drag limiting systems.
§ 25.939Turbine engine operating characteristics.
§ 25.941Inlet, engine, and exhaust compatibility.
§ 25.943Negative acceleration.
§ 25.945Thrust or power augmentation system.
Fuel System25.951 – 25.981
§ 25.951General.
§ 25.952Fuel system analysis and test.
§ 25.953Fuel system independence.
§ 25.954Fuel system lightning protection.
§ 25.955Fuel flow.
§ 25.957Flow between interconnected tanks.
§ 25.959Unusable fuel supply.
§ 25.961Fuel system hot weather operation.
§ 25.963Fuel tanks: general.
§ 25.965Fuel tank tests.
§ 25.967Fuel tank installations.
§ 25.969Fuel tank expansion space.
§ 25.971Fuel tank sump.
§ 25.973Fuel tank filler connection.
§ 25.975Fuel tank vents and carburetor vapor vents.
§ 25.977Fuel tank outlet.
§ 25.979Pressure fueling system.
§ 25.981Fuel tank explosion prevention.
Fuel System Components25.991 – 25.1001
§ 25.991Fuel pumps.
§ 25.993Fuel system lines and fittings.
§ 25.994Fuel system components.
§ 25.995Fuel valves.
§ 25.997Fuel strainer or filter.
§ 25.999Fuel system drains.
§ 25.1001Fuel jettisoning system.
Oil System25.1011 – 25.1027
§ 25.1011General.
§ 25.1013Oil tanks.
§ 25.1015Oil tank tests.
§ 25.1017Oil lines and fittings.
§ 25.1019Oil strainer or filter.
§ 25.1021Oil system drains.
§ 25.1023Oil radiators.
§ 25.1025Oil valves.
§ 25.1027Propeller feathering system.
Cooling25.1041 – 25.1045
§ 25.1041General.
§ 25.1043Cooling tests.
§ 25.1045Cooling test procedures.
Induction System25.1091 – 25.1107
§ 25.1091Air induction.
§ 25.1093Induction system icing protection.
§ 25.1101Carburetor air preheater design.
§ 25.1103Induction system ducts and air duct systems.
§ 25.1105Induction system screens.
§ 25.1107Inter-coolers and after-coolers.
Exhaust System25.1121 – 25.1127
§ 25.1121General.
§ 25.1123Exhaust piping.
§ 25.1125Exhaust heat exchangers.
§ 25.1127Exhaust driven turbo-superchargers.
Powerplant Controls and Accessories25.1141 – 25.1167
§ 25.1141Powerplant controls: general.
§ 25.1142Auxiliary power unit controls.
§ 25.1143Engine controls.
§ 25.1145Ignition switches.
§ 25.1147Mixture controls.
§ 25.1149Propeller speed and pitch controls.
§ 25.1153Propeller feathering controls.
§ 25.1155Reverse thrust and propeller pitch settings below the flight regime.
§ 25.1157Carburetor air temperature controls.
§ 25.1159Supercharger controls.
§ 25.1161Fuel jettisoning system controls.
§ 25.1163Powerplant accessories.
§ 25.1165Engine ignition systems.
§ 25.1167Accessory gearboxes.
Powerplant Fire Protection25.1181 – 25.1207
§ 25.1181Designated fire zones; regions included.
§ 25.1182Nacelle areas behind firewalls, and engine pod attaching structures containing flammable fluid lines.
§ 25.1183Flammable fluid-carrying components.
§ 25.1185Flammable fluids.
§ 25.1187Drainage and ventilation of fire zones.
§ 25.1189Shutoff means.
§ 25.1191Firewalls.
§ 25.1192Engine accessory section diaphragm.
§ 25.1193Cowling and nacelle skin.
§ 25.1195Fire extinguishing systems.
§ 25.1197Fire extinguishing agents.
§ 25.1199Extinguishing agent containers.
§ 25.1201Fire extinguishing system materials.
§ 25.1203Fire detector system.
§ 25.1207Compliance.