# 14 C.F.R. § 27.1509 (2026): Rotor speed

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1509

## Section

- **Citation:** 14 C.F.R. § 27.1509 (2026)
- **Heading:** Rotor speed
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 14 CFR: Aeronautics and Space / Chapter I: FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION / Part 27: AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT / Subpart G: Operating Limitations and Information / § 27.1509: § 27.1509   Rotor speed.

## 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 C.F.R. § 27.1501 (2026) § 27.1501   General.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1501.md)
- [14 C.F.R. § 27.1503 (2026) § 27.1503   Airspeed limitations: general.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1503.md)
- [14 C.F.R. § 27.1505 (2026) § 27.1505   Never-exceed speed.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1505.md)
- [14 C.F.R. § 27.1509 (2026) § 27.1509   Rotor speed.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1509.md)
- [14 C.F.R. § 27.1519 (2026) § 27.1519   Weight and center of gravity.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1519.md)
- [14 C.F.R. § 27.1521 (2026) § 27.1521   Powerplant limitations.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1521.md)
- [14 C.F.R. § 27.1523 (2026) § 27.1523   Minimum flight crew.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1523.md)
- [14 C.F.R. § 27.1525 (2026) § 27.1525   Kinds of operations.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1525.md)
- [14 C.F.R. § 27.1527 (2026) § 27.1527   Maximum operating altitude.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1527.md)
- [14 C.F.R. § 27.1529 (2026) § 27.1529   Instructions for Continued Airworthiness.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1529.md)
- [14 C.F.R. § 27.1541 (2026) § 27.1541   General.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1541.md)
- [14 C.F.R. § 27.1543 (2026) § 27.1543   Instrument markings: general.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1543.md)
- [14 C.F.R. § 27.1545 (2026) § 27.1545   Airspeed indicator.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1545.md)
- [14 C.F.R. § 27.1547 (2026) § 27.1547   Magnetic direction indicator.](https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1547.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T14_P27_S27_1509. Check the current official text before relying on it. Not legal advice.