A device for providing a signal indicating whether a deployed evacuation slide of an aircraft is ready for use, comprising: a tilt sensor adapted to measure a tilt angle of the device about a predetermined axis with respect to a reference plane, and to provide a tilt sensor measurement signal characteristic of the measured tilt angle, at least one inertial sensor adapted to detect an acceleration of the device and to provide an inertial sensor measurement signal characteristic of the detected acceleration, a slide signal input terminal for receiving a slide signal having a predetermined format, which is defined such that the slide signal is indicative of deployment of an evacuation slide of an aircraft and of a length of the slide after deployment thereof, a tilt angle signal output terminal at which a tilt angle signal representative of the tilt sensor measurement signal is provided, a slide status output terminal, and a control unit connected to the tilt sensor, to the at least one inertial sensor, to the slide signal input terminal, and to the slide status output terminal, wherein the control unit is adapted to determine, based on the detected at least one acceleration derived from the inertial sensor measurement signal, a moment in time when the device is at rest with respect to the earth and to then set the orientation of the reference plane to a predetermined orientation with respect to the device, wherein the control unit stores aircraft specific data associated with a defined type of aircraft and depending on the position of a door provided by a door arrangement of the aircraft with respect to ground when the aircraft rests on a flat surface, and wherein the control unit is adapted to determine, at least for a predetermined minimum time period following an indication of deployment of an evacuation slide derived from the received slide signal and on the basis of a tilt angle derived from the received tilt sensor measurement signal, a slide length derived from the received slide signal and the aircraft specific data, if the slide length is large enough for the evacuation slide to be ready for use at the tilt angle, and to generate based on the result of the determination a slide status signal, which is provided at the slide status output terminal. a tilt sensor adapted to measure a tilt angle of the device about a predetermined axis with respect to a reference plane, and to provide a tilt sensor measurement signal characteristic of the measured tilt angle, at least one inertial sensor adapted to detect an acceleration of the device and to provide an inertial sensor measurement signal characteristic of the detected acceleration, a slide signal input terminal for receiving a slide signal having a predetermined format, which is defined such that the slide signal is indicative of deployment of an evacuation slide of an aircraft and of a length of the slide after deployment thereof, a tilt angle signal output terminal at which a tilt angle signal representative of the tilt sensor measurement signal is provided, a slide status output terminal, and a control unit connected to the tilt sensor, to the at least one inertial sensor, to the slide signal input terminal, and to the slide status output terminal, wherein the control unit is adapted to determine, based on the detected at least one acceleration derived from the inertial sensor measurement signal, a moment in time when the device is at rest with respect to the earth and to then set the orientation of the reference plane to a predetermined orientation with respect to the device, wherein the control unit stores aircraft specific data associated with a defined type of aircraft and depending on the position of a door provided by a door arrangement of the aircraft with respect to ground when the aircraft rests on a flat surface, and wherein the control unit is adapted to determine, at least for a predetermined minimum time period following an indication of deployment of an evacuation slide derived from the received slide signal and on the basis of a tilt angle derived from the received tilt sensor measurement signal, a slide length derived from the received slide signal and the aircraft specific data, if the slide length is large enough for the evacuation slide to be ready for use at the tilt angle, and to generate based on the result of the determination a slide status signal, which is provided at the slide status output terminal.