14 C.F.R. § 27.735 Brakes.
Title 14 - Aeronautics and Space
For rotorcraft with wheel-type landing gear, a braking device must be installed that is— (a) Controllable by the pilot; (b) Usable during power-off landings; and (c) Adequate to— (1) Counteract any normal unbalanced torque when starting or stopping the rotor; and (2) Hold the rotorcraft parked on a 10-degree slope on a dry, smooth pavement. [Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27–21, 49 FR 44434, Nov. 6, 1984]
Title 14: Aeronautics and Space
PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT
Subpart D—Design and Construction
Landing Gear
§ 27.735 Brakes.