FAA Federal Aviation Regulations (FARS, 14 CFR)

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. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-24, 49 FR 44437, Nov. 6, 1984]