Abstract: A sensor apparatus for the non-contact monitoring of a predetermined end position of a mechanical element, in particular a door in an aircraft, is provided which comprises a probe, an electronic measurement means, and a control means. The probe is attached to the aircraft and samples the distance between itself and a target surface on the element to be monitored. The electronic measurement means is connected to the probe and is so constructed that in response to at least one control signal it generates a measurement signal corresponding to the distance. The control means is connected to the electronic measurement means and generates the control signals, receives measurement signals and generates an indicator signal to indicate that the end position has been detected.

Abstract: In a control assembly for a freight loading system having a plurality of drive roller units, each drive roller unit has an electronic control arrangement associated therewith for detecting operating parameters which characterize the instantaneous operating condition of the associated drive roller unit. Information signals are derived from the operating parameters and interchanged between the drive roller units to control the sequence of operation thereof.