Two-flow turbine engine comprising a motor and a nacelle surrounding the motor and in which a secondary duct for a secondary flow is delimited between the nacelle and the motor, said nacelle comprising: - a fan casing comprising a front part and a rear part, - a fixed assembly arranged at the front and comprising a fixed structure and the front part, - a movable assembly arranged behind the fixed assembly and comprising a frame having open regions, a movable cowl secured to the frame and the rear part mounted in front of the movable cowl, the movable assembly being movable in translation on the fixed structure in a direction of translation between an advanced position in which the movable assembly is positioned such that the rear part is moved close to and extends the front part, and a retracted position in which the movable assembly is positioned such that the rear part is moved rearwards away from the front part so as to define, between them, an open window between the secondary duct and the exterior of the nacelle, - a plurality of interior doors mounted in articulated fashion, along a rear edge, on the frame, between a stowed position and a deployed position where, in the stowed position, each interior door blocks an open region of the frame, and in the deployed position each interior door extends across the secondary duct, - a first actuator provided to make the frame move in translation from the advanced position to the retracted position and vice versa, and - a second actuator provided to make each interior door move from the stowed position to the deployed position and vice versa, characterized in that the rear part is divided into multiple exterior flaps, each being mounted in articulated fashion, at its rear edge, to the frame and being movable between a lowered position, in which each exterior flap is aligned with the mobile cowl and extends facing a rear part of the open region of the frame, and a raised position, in which each exterior flap is tilted so as to point its front edge towards the outside and so as to free up the rear part of the open region of the frame, and in that said nacelle further comprises, for each exterior flap, an electric motor that is provided for moving said exterior flap from the lowered position to the raised position and vice versa. - a fan casing comprising a front part and a rear part, - a fixed assembly arranged at the front and comprising a fixed structure and the front part, - a movable assembly arranged behind the fixed assembly and comprising a frame having open regions, a movable cowl secured to the frame and the rear part mounted in front of the movable cowl, the movable assembly being movable in translation on the fixed structure in a direction of translation between an advanced position in which the movable assembly is positioned such that the rear part is moved close to and extends the front part, and a retracted position in which the movable assembly is positioned such that the rear part is moved rearwards away from the front part so as to define, between them, an open window between the secondary duct and the exterior of the nacelle, - a plurality of interior doors mounted in articulated fashion, along a rear edge, on the frame, between a stowed position and a deployed position where, in the stowed position, each interior door blocks an open region of the frame, and in the deployed position each interior door extends across the secondary duct, - a first actuator provided to make the frame move in translation from the advanced position to the retracted position and vice versa, and - a second actuator provided to make each interior door move from the stowed position to the deployed position and vice versa,