An ejection device for an aircraft hatch having at least one articulation hinge. The articulation hinge is provided with a lower element designed to be mounted in rotation on structure of the aircraft, and an upper element designed to be joined to the hatch panel. The lower element and the upper element are connected to one another in a reversible manner. The ejection device has guide means in which the upper element of the articulation hinge is engaged, to hold the upper element in the axis of rotation (A) of the lower element during the activation of the hatch. The upper element of the articulation hinge can be separated from the guide means beyond a critical swing angle, so that the upper element is separated from the lower element of the articulation hinge. The invention also concerns an ejectable hatch for an aircraft.