Propulsion unit with longitudinal blocking of at least one nacelle cowl

A propulsion unit for aircraft comprising:

• a nacelle having a cross-section provided with at least one cowl movably mounted so as to be deployed between a working position and a maintenance position in order to provide access to a turbomachine intended to be mounted in the nacelle,
• a pylon adapted to fasten the turbomachine and/or the nacelle to the aircraft, the pylon comprising, for each cowl, a first hinge portion configured to cooperate with a second hinge portion of a corresponding cowl to allow pivoting of the corresponding cowl about a corresponding longitudinal axis between the working position and the maintenance position,
• a longitudinal blocking mechanism comprising, for each cowl, a finger and a sleeve having two retaining portions extending transversely to the corresponding longitudinal axis, the finger being configured to be guided between the two retaining portions in the maintenance position;
• the finger and the sleeve being configured to describe a relative trajectory along a circular arc about the corresponding longitudinal axis between the working position and the maintenance position;
• the sleeve being attached to the corresponding cowl or a connecting element to the corresponding cowl and the finger being attached to the pylon, or vice versa.