where --
KE=Kinetic energy per wheel (ft.-lb.);
W=Design landing weight (lb.);
V=Airplane speed in knots. V must be not less than VS√,
the poweroff stalling speed of the airplane at sea level, at the design
landing weight, and in the landing configuration; and
N=Number of main wheels with brakes.
(b) Brakes must be able to prevent the
wheels from rolling on a paved runway with takeoff power on the critical
engine, but need not prevent movement of the airplane with wheels locked.
(c) During the landing distance
determination required by §23.75, the pressure on the wheel braking system
must not exceed the pressure specified by the brake manufacturer.
(d) If antiskid devices are installed,
the devices and associated systems must be designed so that no single
probable malfunction or failure will result in a hazardous loss of braking
ability or directional control of the airplane.
(e) In addition, for commuter category
airplanes, the rejected takeoff brake kinetic energy capacity rating of
each main wheel brake assembly must not be less than the kinetic energy
absorption requirements determined under either of the following methods
--
(1) The brake kinetic energy absorption
requirements must be based on a conservative rational analysis of the
sequence of events expected during a rejected takeoff at the design
takeoff weight.
(2) Instead of a rational analysis, the
kinetic energy absorption requirements for each main wheel brake assembly
may be derived from the following formula --
KE=0.0443 WV 2N
where,
KE=Kinetic energy per wheel (ft.-lbs.);
W=Design takeoff weight (lbs.);
V=Ground speed, in knots, associated with the maximum
value of V1 selected in accordance with §23.51(c)(1);
N=Number of main wheels with brakes.
[Amdt. 23-7, 34 FR 13092, Aug. 13, 1969, as
amended by Amdt. 23-24, 44 FR 68742, Nov. 29, 1979; Amdt. 23-42, 56 FR
354, Jan. 3, 1991; Amdt. 23-49, 61 FR 5166, Feb. 9, 1996]