Dynamic exterior aircraft light unit and method of operating a dynamic exterior aircraft light unit

1. A dynamic exterior aircraft light unit, configured for being mounted to an aircraft (for illuminating an aircraft environment, the dynamic exterior aircraft light unit comprising:

an LED group, comprising a plurality of LEDs, and

an optical system, comprising at least one optical element, the optical system being associated with the LED group for shaping an output light intensity distribution from the light emitted by the LED group,

wherein the LED group and the optical system are stationary within the dynamic exterior aircraft light unit, with each LED of the LED group having a set position with respect to the optical system, and

wherein the dynamic exterior aircraft light unit is configured to be operated in a plurality of operating modes, with a respective subset of the plurality of LEDs being switched on in each of the plurality of operating modes and with a different output light intensity distribution being emitted by the dynamic exterior aircraft light unit in each of the plurality of operating modes,

wherein a selection of the operating mode depending on an acceleration of the aircraft in the aircraft frame of reference,

wherein the selection of the operating mode depends on the acceleration of the aircraft over an acceleration consideration interval, and

wherein the dynamic exterior aircraft light unit is configured to determine a net acceleration direction from the acceleration of the aircraft over the acceleration consideration interval, wherein the selection of the operating mode depends on the net acceleration direction.

2. The dynamic exterior aircraft light unit according to claim 1 , wherein the dynamic exterior aircraft light unit is one of a landing light unit, a take-off light unit, a taxi light unit, and a runway turn-off light unit.

3. The dynamic c exterior aircraft light unit according to claim 1 , wherein the acceleration consideration interval is between 5 s and 1 min.

4. The dynamic exterior aircraft light unit according to claim 1 , wherein the acceleration consideration interval is a rolling time interval.

5. An aircraft comprising at least one dynamic exterior aircraft light unit according to claim 1 , mounted externally to the aircraft.

6. The dynamic exterior aircraft light unit according to claim 1 , wherein each of the plurality of operating modes has a main light emission direction and wherein the plurality of operating modes differ with respect to their main light emission directions, with the selection of a particular operating mode being such that the main light emission direction of the particular operating mode corresponds to the net acceleration direction.

7. The dynamic exterior aircraft light unit according to claim 1 , configured to determine the net acceleration direction on the basis of at least one of an average of the acceleration of the aircraft over the acceleration consideration interval, a weighed average of the acceleration of the aircraft over the acceleration consideration interval, and a histogram analysis of the acceleration of the aircraft over the acceleration consideration interval.

8. The dynamic exterior aircraft light unit according to claim 1 , wherein the acceleration of the aircraft is a three-dimensional acceleration of the aircraft.

9. The Dynamic exterior aircraft light unit according to claim 1 , wherein the acceleration of the aircraft is a gravity-compensated acceleration of the aircraft.

10. The dynamic exterior aircraft light unit according to claim 1 , further comprising at least one of:

an acceleration signal input, configured for receiving acceleration data with respect to the acceleration of the aircraft from an external source, such as from at least one external acceleration sensor or from a board computer, and

at least one acceleration sensor, configured to measure the acceleration of the aircraft.

11. The dynamic exterior aircraft light unit according to claim 1 ,

wherein the dynamic exterior aircraft light unit is configured to increase an opening angle of the output light intensity distribution for a negative acceleration in a longitudinal direction of the aircraft, and/or

wherein the dynamic exterior aircraft light unit is configured to decrease an opening angle of the output light intensity distribution for a positive acceleration in a longitudinal direction of the aircraft.

12. A method of operating a dynamic exterior aircraft light unit of an aircraft, comprising an LED group, comprising a plurality of LEDs, and an optical system, comprising at least one optical element, the optical system being associated with the LED group for shaping an output light intensity distribution from the light emitted by the LED group, wherein the method comprises the steps of:

determining an acceleration of the aircraft in the aircraft frame of reference and determining a net acceleration direction from the acceleration of the aircraft over an acceleration consideration interval,

selecting one of a plurality of operating modes depending on the net acceleration direction, with the plurality of operating modes differing with respect to their respective output light intensity distributions emitted by the dynamic exterior aircraft light unit, and

switching on a respective subset of the plurality of LEDs depending on said selected one of the plurality of operating modes.