§29.549 Fuselage and rotor pylon structures

(a) Each fuselage and rotor py lon st ructure must be designed to withstand: (1) The critical loads prescribed in CS 29.337 to 29.341, and CS 29.351; (2) The appl icable ground loads prescribed in CS 29.235, 29.471 t o 29.485, CS 29.493, 29.497, 29.505, and 29.521; and (3) The loads prescribed in CS 29.547(d)(1) and (e)(1)(i). (b) Auxiliary rotor thru st, the torque reaction of each rotor drive system , and the balancing air and inertia loads occurring under accelerated flight conditions, must be considered. (c) Each engine mount and adjacent fuselage structure must be desi gned t o wi thstand t he l oads occurring under accelerated flight and landing conditions, including engine torque. (d) Reserved. (e) If approval for the use of 2½-m inute OEI power is requested, each engine m ount and adjacent structure m ust be designed to withstand the lo ads resu lting fro m a limit torque equal to 1.25 times t he m ean t orque for 2½-m inute power OEI combined with 1g flight loads.