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Part 27
§ 27.661

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14 CFR · Part 27

14 CFR § 27.661

Rotor blade clearance.

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Read in Subpart D

Part 27 Contents

Subpart A: General
Subpart B: Flight
Subpart C: Strength Requirements
Subpart D: Design and Construction
Subpart E: Powerplant
Subpart F: Equipment
Subpart G: Operating Limitations and Information
Appendix A to Part 27: Instructions for Continued Airworthiness
Appendix B to Part 27: Airworthiness Criteria for Helicopter Instrument Flight
Appendix C to Part 27: Criteria for Category A
Appendix D to Part 27: HIRF Environments and Equipment HIRF Test Levels

There must be enough clearance between the rotor blades and other parts of the structure to prevent the blades from striking any part of the structure during any operating condition.

Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.

Primary Source

Official Source (14 CFR · Part 27)