# 14 CFR § 27.1509: Rotor speed

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1509

## Section

- **Citation:** 14 CFR § 27.1509
- **Heading:** Rotor speed
- **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 G—Operating Limitations and Information > Operating Limitations

## Text

(a) Maximum power-off (autorotation). The maximum power-off rotor speed must be established so that it does not exceed 95 percent of the lesser of—
(1) The maximum design r.p.m. determined under § 27.309(b); and
(2) The maximum r.p.m. shown during the type tests.
(b) Minimum power off. The minimum power-off rotor speed must be established so that it is not less than 105 percent of the greater of—
(1) The minimum shown during the type tests; and
(2) The minimum determined by design substantiation.
(c) Minimum power on. The minimum power-on rotor speed must be established so that it is—
(1) Not less than the greater of—
(i) The minimum shown during the type tests; and
(ii) The minimum determined by design substantiation; and
(2) Not more than a value determined under § 27.33(a)(1) and (b)(1).

## Nearby sections

- [14 CFR § 27.1503 § 27.1503 Airspeed limitations: general.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1503.md)
- [14 CFR § 27.1505 § 27.1505 Never-exceed speed.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1505.md)
- [14 CFR § 27.1509 § 27.1509 Rotor speed.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1509.md)
- [14 CFR § 27.1519 § 27.1519 Weight and center of gravity.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1519.md)
- [14 CFR § 27.1521 § 27.1521 Powerplant limitations.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1521.md)
- [14 CFR § 27.1523 § 27.1523 Minimum flight crew.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1523.md)
- [14 CFR § 27.1525 § 27.1525 Kinds of operations.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1525.md)
- [14 CFR § 27.1527 § 27.1527 Maximum operating altitude.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1527.md)
- [14 CFR § 27.1529 § 27.1529 Instructions for Continued Airworthiness.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1529.md)
- [14 CFR § 27.1541 § 27.1541 General.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1541.md)
- [14 CFR § 27.1543 § 27.1543 Instrument markings: general.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1543.md)
- [14 CFR § 27.1545 § 27.1545 Airspeed indicator.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1545.md)
- [14 CFR § 27.1547 § 27.1547 Magnetic direction indicator.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1547.md)
- [14 CFR § 27.1549 § 27.1549 Powerplant instruments.](https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1549.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-14-27.1509. Check the current official text before relying on it. Not legal advice.