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]