Volume: 1Date: 2024-01-01Original Date: 2024-01-01Title: Section 27.1509 - Rotor speed.Context:
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.
§ 27.1509Rotor speed.
(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—
Code of Federal Regulations /
Title 14 - Aeronautics and Space /
Vol. 1 / 2024-01-01561
(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).