U.S. Code of Federal Regulations

Regulations most recently checked for updates: Feb 11, 2026

All TitlesTitle 14Chapter IPart 27Subpart C - Subpart C—Strength Requirements

GENERAL
§ 27.301 - Loads.
§ 27.303 - Factor of safety.
§ 27.305 - Strength and deformation.
§ 27.307 - Proof of structure.
§ 27.309 - Design limitations.

FLIGHT LOADS
§ 27.321 - General.
§ 27.337 - Limit maneuvering load factor.
§ 27.339 - Resultant limit maneuvering loads.
§ 27.341 - Gust loads.
§ 27.351 - Yawing conditions.
§ 27.361 - Engine torque.

CONTROL SURFACE AND SYSTEM LOADS
§ 27.391 - General.
§ 27.395 - Control system.
§ 27.397 - Limit pilot forces and torques.
§ 27.399 - Dual control system.
§ 27.411 - Ground clearance: tail rotor guard.
§ 27.427 - Unsymmetrical loads.

GROUND LOADS
§ 27.471 - General.
§ 27.473 - Ground loading conditions and assumptions.
§ 27.475 - Tires and shock absorbers.
§ 27.477 - Landing gear arrangement.
§ 27.479 - Level landing conditions.
§ 27.481 - Tail-down landing conditions.
§ 27.483 - One-wheel landing conditions.
§ 27.485 - Lateral drift landing conditions.
§ 27.493 - Braked roll conditions.
§ 27.497 - Ground loading conditions: landing gear with tail wheels.
§ 27.501 - Ground loading conditions: landing gear with skids.
§ 27.505 - Ski landing conditions.

WATER LOADS
§ 27.521 - Float landing conditions.

MAIN COMPONENT REQUIREMENTS
§ 27.547 - Main rotor structure.
§ 27.549 - Fuselage, landing gear, and rotor pylon structures.

EMERGENCY LANDING CONDITIONS
§ 27.561 - General.
§ 27.562 - Emergency landing dynamic conditions.
§ 27.563 - Structural ditching provisions.

FATIGUE EVALUATION
§ 27.571 - Fatigue evaluation of flight structure.
§ 27.573 - Damage Tolerance and Fatigue Evaluation of Composite Rotorcraft Structures.
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