U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 14Chapter IPart 25Subpart D - Subpart D—Design and Construction

PRESSURIZATION
§ 25.841 - Pressurized cabins.
§ 25.843 - Tests for pressurized cabins.

FIRE PROTECTION
§ 25.851 - Fire extinguishers.
§ 25.853 - Compartment interiors.
§ 25.854 - Lavatory fire protection.
§ 25.855 - Cargo or baggage compartments.
§ 25.856 - Thermal/Acoustic insulation materials.
§ 25.857 - Cargo compartment classification.
§ 25.858 - Cargo or baggage compartment smoke or fire detection systems.
§ 25.859 - Combustion heater fire protection.
§ 25.863 - Flammable fluid fire protection.
§ 25.865 - Fire protection of flight controls, engine mounts, and other flight structure.
§ 25.867 - Fire protection: other components.
§ 25.869 - Fire protection: systems.

MISCELLANEOUS
§ 25.871 - Leveling means.
§ 25.875 - Reinforcement near propellers.
§ 25.899 - Electrical bonding and protection against static electricity.

GENERAL
§ 25.601 - General.
§ 25.603 - Materials.
§ 25.605 - Fabrication methods.
§ 25.607 - Fasteners.
§ 25.609 - Protection of structure.
§ 25.611 - Accessibility provisions.
§ 25.613 - Material strength properties and material design values.
§ 25.619 - Special factors.
§ 25.621 - Casting factors.
§ 25.623 - Bearing factors.
§ 25.625 - Fitting factors.
§ 25.629 - Aeroelastic stability requirements.
§ 25.631 - Bird strike damage.

CONTROL SURFACES
§ 25.651 - Proof of strength.
§ 25.655 - Installation.
§ 25.657 - Hinges.

CONTROL SYSTEMS
§ 25.671 - General.
§ 25.672 - Stability augmentation and automatic and power-operated systems.
§ 25.675 - Stops.
§ 25.677 - Trim systems.
§ 25.679 - Control system gust locks.
§ 25.681 - Limit load static tests.
§ 25.683 - Operation tests.
§ 25.685 - Control system details.
§ 25.689 - Cable systems.
§ 25.693 - Joints.
§ 25.697 - Lift and drag devices, controls.
§ 25.699 - Lift and drag device indicator.
§ 25.701 - Flap and slat interconnection.
§ 25.703 - Takeoff warning system.

LANDING GEAR
§ 25.721 - General.
§ 25.723 - Shock absorption tests.
§§ 25.725-25.727 - §[Reserved]
§ 25.729 - Retracting mechanism.
§ 25.731 - Wheels.
§ 25.733 - Tires.
§ 25.735 - Brakes and braking systems.
§ 25.737 - Skis.

FLOATS AND HULLS
§ 25.751 - Main float buoyancy.
§ 25.753 - Main float design.
§ 25.755 - Hulls.

PERSONNEL AND CARGO ACCOMMODATIONS
§ 25.771 - Pilot compartment.
§ 25.772 - Pilot compartment doors.
§ 25.773 - Pilot compartment view.
§ 25.775 - Windshields and windows.
§ 25.777 - Cockpit controls.
§ 25.779 - Motion and effect of cockpit controls.
§ 25.781 - Cockpit control knob shape.
§ 25.783 - Fuselage doors.
§ 25.785 - Seats, berths, safety belts, and harnesses.
§ 25.787 - Stowage compartments.
§ 25.789 - Retention of items of mass in passenger and crew compartments and galleys.
§ 25.791 - Passenger information signs and placards.
§ 25.793 - Floor surfaces.
§ 25.795 - Security considerations.

EMERGENCY PROVISIONS
§ 25.801 - Ditching.
§ 25.803 - Emergency evacuation.
§ 25.807 - Emergency exits.
§ 25.809 - Emergency exit arrangement.
§ 25.810 - Emergency egress assist means and escape routes.
§ 25.811 - Emergency exit marking.
§ 25.812 - Emergency lighting.
§ 25.813 - Emergency exit access.
§ 25.815 - Width of aisle.
§ 25.817 - Maximum number of seats abreast.
§ 25.819 - Lower deck service compartments (including galleys).
§ 25.820 - Lavatory doors.

VENTILATION AND HEATING
§ 25.831 - Ventilation.
§ 25.832 - Cabin ozone concentration.
§ 25.833 - Combustion heating systems.
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