# 14 CFR § 27.339: Resultant limit maneuvering loads

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-14-27.339

## Section

- **Citation:** 14 CFR § 27.339
- **Heading:** Resultant limit maneuvering loads
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 14—Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER C—AIRCRAFT > PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT > Subpart C—Strength Requirements > Flight Loads

## Text

The loads resulting from the application of limit maneuvering load factors are assumed to act at the center of each rotor hub and at each auxiliary lifting surface, and to act in directions, and with distributions of load among the rotors and auxiliary lifting surfaces, so as to represent each critical maneuvering condition, including power-on and power-off flight with the maximum design rotor tip speed ratio. The rotor tip speed ratio is the ratio of the rotorcraft flight velocity component in the plane of the rotor disc to the rotational tip speed of the rotor blades, and is expressed as follows:
where—
V = The airspeed along flight path (f.p.s.);
a = The angle between the projection, in the plane of symmetry, of the axis of no feathering and a line perpendicular to the flight path (radians, positive when axis is pointing aft);
omega = The angular velocity of rotor (radians per second); and
R = The rotor radius (ft).
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-11, 41 FR 55469, Dec. 20, 1976]

## Nearby sections

- [14 CFR § 27.301 § 27.301 Loads.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.301.md)
- [14 CFR § 27.303 § 27.303 Factor of safety.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.303.md)
- [14 CFR § 27.305 § 27.305 Strength and deformation.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.305.md)
- [14 CFR § 27.307 § 27.307 Proof of structure.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.307.md)
- [14 CFR § 27.309 § 27.309 Design limitations.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.309.md)
- [14 CFR § 27.321 § 27.321 General.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.321.md)
- [14 CFR § 27.337 § 27.337 Limit maneuvering load factor.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.337.md)
- [14 CFR § 27.339 § 27.339 Resultant limit maneuvering loads.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.339.md)
- [14 CFR § 27.341 § 27.341 Gust loads.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.341.md)
- [14 CFR § 27.351 § 27.351 Yawing conditions.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.351.md)
- [14 CFR § 27.361 § 27.361 Engine torque.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.361.md)
- [14 CFR § 27.391 § 27.391 General.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.391.md)
- [14 CFR § 27.395 § 27.395 Control system.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.395.md)
- [14 CFR § 27.397 § 27.397 Limit pilot forces and torques.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.397.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-14-27.339. Check the current official text before relying on it. Not legal advice.