A nacelle for an aircraft engine comprising a first fan cowl and a second fan cowl , each fan cowl comprising a hinged end and a closing end , each fan cowl being mobile between a closed operating position and an open maintenance position, the first fan cowl having a larger angular coverage than the second fan cowl, the first fan cowl comprising an upper part connected to a lower part by an intermediate hinge so as to allow the lower part to fold towards the upper part.