§27.1509. Rotor speed.

14 C.F.R. § 27.1509

(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).

Notes, amendments, and revision history

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

Source: Docket No. 5074, 29 FR 15695, Nov. 24, 1964, unless otherwise noted.