§29.733 Tyres

Each landing gear wheel must have a tyre: (a) That is a proper fit on the rim of the wheel; and (b) Of a rating that is not exceeded under: (1) The design maximum weight; (2) A load on each m ain wheel ty re equal to the static ground reaction corresponding to the critical centre of gravity; and (3) A load on nose wheel ty res to be compared with the dy namic rating established for those tyres equal to the reaction obtained at the nose wheel, assum ing that the m ass of the rotorcraft acts as the most critical centre of gravity and exerts a force of 1.0 g downward and 0.25 g forward, the reactions being distributed to the nose and m ain wheels according to the principles of statics with the drag reaction at the ground applied only at wheels with brakes. (c) Each ty re installed on a retractable landing gear sy stem m ust, at the m aximum size of the ty re type expected in service, have a clearance to surrounding structure and sy stems that is adequate to prevent contact between the ty re and any part of the structure or systems.