29.1509—Rotor 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 § 29.309(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