U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 11, 2026

All TitlesTitle 14Chapter IPart 25Subpart C - Subpart C—Structure

GENERAL
§ 25.301 - Loads.
§ 25.302 - Interaction of systems and structures.
§ 25.303 - Factor of safety.
§ 25.305 - Strength and deformation.
§ 25.307 - Proof of structure.

FLIGHT LOADS
§ 25.321 - General.

FLIGHT MANEUVER AND GUST CONDITIONS
§ 25.331 - Symmetric maneuvering conditions.
§ 25.333 - Flight maneuvering envelope.
§ 25.335 - Design airspeeds.
§ 25.337 - Limit maneuvering load factors.
§ 25.341 - Gust and turbulence loads.
§ 25.343 - Design fuel and oil loads.
§ 25.345 - High lift devices.
§ 25.349 - Rolling conditions.
§ 25.351 - Yaw maneuver conditions.
§ 25.353 - Rudder control reversal conditions.

SUPPLEMENTARY CONDITIONS
§ 25.361 - Engine and auxiliary power unit torque.
§ 25.362 - Engine failure loads.
§ 25.363 - Side load on engine and auxiliary power unit mounts.
§ 25.365 - Pressurized compartment loads.
§ 25.367 - Unsymmetrical loads due to engine failure.
§ 25.371 - Gyroscopic loads.
§ 25.373 - Speed control devices.

CONTROL SURFACE AND SYSTEM LOADS
§ 25.391 - Control surface loads: General.
§ 25.393 - Loads parallel to hinge line.
§ 25.395 - Control system.
§ 25.397 - Control system loads.
§ 25.399 - Dual control system.
§ 25.405 - Secondary control system.
§ 25.407 - Trim tab effects.
§ 25.409 - Tabs.
§ 25.415 - Ground gust conditions.
§ 25.427 - Unsymmetrical loads.
§ 25.445 - Auxiliary aerodynamic surfaces.
§ 25.457 - Wing flaps.
§ 25.459 - Special devices.

GROUND LOADS
§ 25.471 - General.
§ 25.473 - Landing load conditions and assumptions.
§ 25.477 - Landing gear arrangement.
§ 25.479 - Level landing conditions.
§ 25.481 - Tail-down landing conditions.
§ 25.483 - One-gear landing conditions.
§ 25.485 - Side load conditions.
§ 25.487 - Rebound landing condition.
§ 25.489 - Ground handling conditions.
§ 25.491 - Taxi, takeoff and landing roll.
§ 25.493 - Braked roll conditions.
§ 25.495 - Turning.
§ 25.497 - Tail-wheel yawing.
§ 25.499 - Nose-wheel yaw and steering.
§ 25.503 - Pivoting.
§ 25.507 - Reversed braking.
§ 25.509 - Towing loads.
§ 25.511 - Ground load: unsymmetrical loads on multiple-wheel units.
§ 25.519 - Jacking and tie-down provisions.

WATER LOADS
§ 25.521 - General.
§ 25.523 - Design weights and center of gravity positions.
§ 25.525 - Application of loads.
§ 25.527 - Hull and main float load factors.
§ 25.529 - Hull and main float landing conditions.
§ 25.531 - Hull and main float takeoff condition.
§ 25.533 - Hull and main float bottom pressures.
§ 25.535 - Auxiliary float loads.
§ 25.537 - Seawing loads.

EMERGENCY LANDING CONDITIONS
§ 25.561 - General.
§ 25.562 - Emergency landing dynamic conditions.
§ 25.563 - Structural ditching provisions.

FATIGUE EVALUATION
§ 25.571 - Damage-tolerance and fatigue evaluation of structure.

LIGHTNING PROTECTION
§ 25.581 - Lightning protection.
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