An air intake unit for an engine of an aircraft; the intake unit comprises: a tubular housing, which has a longitudinal axis of symmetry, is provided with an outer wall, and has an ogive-shaped front portion and a rear portion; at least one first inlet opening which is obtained in the rear portion through the outer wall of the tubular housing and through which the external air needed to operate the engine can be taken in; at least one air filter, which is supported by the tubular housing and engages the first inlet opening, so as to filter the external air flowing through the first inlet opening; at least one second inlet opening, which is obtained in the ogive-shaped front portion through a limited portion of the outer wall of the tubular housing, consist of a through hole made in the outer wall of the tubular housing, is separate from and independent of the first inlet opening and the air filter, and through which the external air needed to operate the engine can be taken in; a shutter device, which is coupled to the second inlet opening and comprises a bulkhead, which is mounted so as to move between a closed position, in which the bulkhead closes the second inlet opening, joining - without gaps - the outer wall of the ogive-shaped front portion in the area of the second inlet opening, and an open position, in which the bulkhead sets the passage through the second inlet opening free, moving away from the outer wall of the ogive-shaped front portion; an actuator, which moves the bulkhead of the shutter device between the closed position and the open position by means of a movement having a radial component relative to the longitudinal axis of symmetry of the tubular housing; the air intake unit is characterized in that the bulkhead of the shutter device opens towards the outside of the tubular housing, so that, in the open position, the bulkhead is completely arranged on the outside of the tubular housing, and in that, in the open position, the bulkhead is arranged to act as a deflector which directs the air towards the second inlet opening. a tubular housing, which has a longitudinal axis of symmetry, is provided with an outer wall, and has an ogive-shaped front portion and a rear portion; at least one first inlet opening which is obtained in the rear portion through the outer wall of the tubular housing and through which the external air needed to operate the engine can be taken in; at least one air filter, which is supported by the tubular housing and engages the first inlet opening, so as to filter the external air flowing through the first inlet opening; at least one second inlet opening, which is obtained in the ogive-shaped front portion through a limited portion of the outer wall of the tubular housing, consist of a through hole made in the outer wall of the tubular housing, is separate from and independent of the first inlet opening and the air filter, and through which the external air needed to operate the engine can be taken in; a shutter device, which is coupled to the second inlet opening and comprises a bulkhead, which is mounted so as to move between a closed position, in which the bulkhead closes the second inlet opening, joining - without gaps - the outer wall of the ogive-shaped front portion in the area of the second inlet opening, and an open position, in which the bulkhead sets the passage through the second inlet opening free, moving away from the outer wall of the ogive-shaped front portion; an actuator, which moves the bulkhead of the shutter device between the closed position and the open position by means of a movement having a radial component relative to the longitudinal axis of symmetry of the tubular housing; the air intake unit is characterized in that the bulkhead of the shutter device opens towards the outside of the tubular housing, so that, in the open position, the bulkhead is completely arranged on the outside of the tubular housing, and in that, in the open position, the bulkhead is arranged to act as a deflector which directs the air towards the second inlet opening.