Patent ID: 8579230

Claim:
An aircraft engine assembly comprising: a turboshaft engine with a propeller; and an attachment pylon of the turboshaft engine intended to be laterally attached on a rear portion of the structure of the aircraft behind a main wing, said pylon having an outer surface forming an aerodynamic profile incorporating a trailing edge which is arranged upstream of the propeller of the turboshaft engine, wherein the attachment pylon comprises a first mobile rear flap at least partially defining said trailing edge, a first actuator connected to the first mobile rear flap, a second mobile rear flap at least partially defining said trailing edge and being disposed closer to the rear portion of the structure of the aircraft than the first mobile rear flap, and a second actuator connected to the second mobile rear flap, wherein a first controller controls the first actuator such that an incidence of the first mobile rear flap is set as a first function of an incidence of the aircraft and a second controller controls the second actuator such that an incidence of the second mobile rear flap is set as a second function of the incidence of the aircraft, and wherein the first function and the second function are different from each other due to acoustic particularities at blade ends of the propeller, and the second function is further based on the acoustic particularities at the blade ends of the propeller.