14 CFR §27.493
Under braked roll conditions with the shock absorbers in their static positions—
- (a)The limit vertical load must be based on a load factor of at least—
- (1)1.33, for the attitude specified in § 27.479(a)(1); and
- (2)1.0 for the attitude specified in § 27.479(a)(2); and
- (b)The structure must be designed to withstand at the ground contact point of each wheel with brakes, a drag load at least the lesser of—
- (1)The vertical load multiplied by a coefficient of friction of 0.8; and
- (2)The maximum value based on limiting brake torque.