14 C.F.R. § 27.1503 Airspeed limitations: general.
Title 14 - Aeronautics and Space
(a) An operating speed range must be established. (b) When airspeed limitations are a function of weight, weight distribution, altitude, rotor speed, power, or other factors, airspeed limitations corresponding with the critical combinations of these factors must be established.
Title 14: Aeronautics and Space
PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT
Subpart G—Operating Limitations and Information
Operating Limitations
§ 27.1503 Airspeed limitations: general.