14 C.F.R. § 29.241 Ground resonance.
Title 14 - Aeronautics and Space
The rotorcraft may have no dangerous tendency to oscillate on the ground with the rotor turning.
Title 14: Aeronautics and Space
PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT
Subpart B—Flight
Ground and Water Handling Characteristics
§ 29.241 Ground resonance.
