Air intake of a turbine aircraft engine, aircraft equipped with such air intake and method for optimizing the operation of a turbine aircraft engine with an air intake

The inlet has a dynamic inlet duct (30) provided with a grid (40) for protection against ingesting foreign bodies. The grid is moved in translation along a dynamic axis (AX1) relative to a front flow section of the duct. A lateral inlet is arranged in a side wall. A covering unit (41) covering the lateral inlet is movable relative to the lateral inlet. A displacement unit (60) allows movement of the covering unit relative to the lateral inlet during movement in translation of the grid. An independent claim is also included for a method for optimizing operation of a turbine engine of an aircraft.