An aircraft hatch emergency opening actuator includes a cylinder connected to the hatch at one of its ends and at its other end to a reference frame of the aircraft. Fluid is fed to the cylinder for emergency opening of the hatch by a device able to adopt two positions. In a rest position the fluid is isolated from the cylinder, and in an active position the fluid is injected into a fluid circuit. A device for delaying the injection of the fluid into the cylinder includes a mobile element in the fluid circuit delaying opening of the circuit when the injection device is in the active position, the injection delay being determined by a time of movement of the mobile element.