Abstract: A brake disc for an aircraft wheel brake including: a temperature sensing device comprising a surface acoustic wave (SAW) sensor element and a sensor antenna, wherein the temperature sensing device is attached to the brake disc by means of a ceramic adhesive and one or more ceramic bolts. A method of attaching a temperature sensing device to a brake disc of an aircraft wheel brake.

Abstract: A temperature sensing device for sensing aircraft wheel brake temperature, the temperature sensing device including: a surface acoustic wave (SAW) sensor element having an interdigital transducer that has electrodes disposed along the surface of a substrate forming a periodic structure. The electrodes having a thickness, in a direction perpendicular to the surface, of between 120 and 190 nanometres.

Abstract: A temperature sensing device to sense aircraft wheel brake temperature is disclosed including a sensing device substrate; and one or more package layers attached to the sensing device substrate, wherein: the sensing device substrate carries one or more electronic components for sensing temperature. Also disclosed is a wireless relay device to wirelessly transmit an interrogation signal to a temperature sensing device and wirelessly receive an output signal from the temperature sensing device, the temperature sensing device to sense aircraft wheel brake temperature, the wireless relay device comprising: a relay substrate; and one or more package layers attached to the relay substrate, wherein: the relay substrate carries one or more electronic components of the wireless relay device. Also disclosed is a method of manufacturing a temperature sensing device to sense aircraft wheel brake temperature.

Abstract: A temperature sensing device for sensing aircraft wheel brake temperature is disclosed including a sensor antenna electrically coupled to a surface acoustic wave, SAW, sensor element, wherein: the sensor antenna comprises a conductive loop disposed on a surface of a substrate, the conductive loop surrounding an attachment region of the substrate, the attachment region having substantially no conductor material thereon. Also disclosed is a brake disc for an aircraft wheel brake comprising the temperature sensing device, and aircraft comprising the brake disc and a method of manufacturing a temperature sensing device.

Abstract: A holder for a wireless relay device is disclosed including a rigid hollow arm member to be received in a groove in a torque tube spline of an aircraft wheel brake; and a support member to support the wireless relay device, the support member mechanically coupled to the rigid hollow arm member towards a first end of the rigid hollow arm member, wherein: the rigid hollow arm member provides a conduit for a communications cable to couple to the wireless relay device. Also disclosed is an aircraft wheel brake comprising the holder and an aircraft comprising the aircraft wheel brake.

Abstract: A temperature sensing device for sensing aircraft wheel brake temperature, the temperature sensing device including a surface acoustic wave, SAW, sensor element with a resonant frequency within a frequency range between 175 megahertz and 190 megahertz at a predetermined temperature. The temperature sensing system also includes a wireless relay device, a method for sensing temperature of a wheel brake of an aircraft.

Abstract: A cable structure to carry signals to and from a component of a temperature sensing arrangement in an aircraft wheel brake is disclosed including elongate elements including a plurality of cables and/or wires, one or more ceramic spacer layers, a ceramic cover layer and a metallic layer surrounding the one or more ceramic spacer layers and the ceramic cover layer. Also disclosed is an aircraft wheel brake comprising the cable structure and an aircraft comprising the aircraft wheel brake.

Abstract: An apparatus for an aircraft having one or more aircraft wheel brakes, and a brake wear sensor configured to measure a wear state of a brake of the one or more aircraft wheel brakes, is disclosed. The apparatus includes a processor configured to determine a wear relationship between a wear state of the brake and a number of use cycles of the brake, determine a predicted wear state of the brake based on the wear relationship; determine a number of future use cycles of the brake based on a predicted condition of the brake, the predicted condition comprising the predicted wear state of the brake; and provide an indication of the determined number of the future use cycles to ground crew and/or a pilot of the aircraft, wherein the number of future use cycles is the number of use cycles for which the brake is allowed to be used, and a use cycle comprises all uses of the brake relating to a flight undertaken by the aircraft.

Abstract: An apparatus and method is disclosed for determining a temperature characteristic at a first location on a wheel or a brake assembly of an aircraft landing gear. The temperature characteristic at the first location is determined using relationship information based on a first temperature at a second location of the wheel or the brake assembly of the landing gear, the relationship information representing a relationship between the temperature characteristic at the first location and the first temperature. Also disclosed is a method to determine the relationship information.

Abstract: An apparatus and method is disclosed for determining a temperature characteristic at a first location on a wheel or a brake assembly of an aircraft landing gear. The temperature characteristic at the first location is determined using relationship information based on a first temperature at a second location of the wheel or the brake assembly of the landing gear, the relationship information representing a relationship between the temperature characteristic at the first location and the first temperature. Also disclosed is a method to determine the relationship information.

Abstract: An apparatus with a processor configured to and a method for determining a number of future use cycles of an aircraft wheel brake based on a predicted condition of the brake is disclosed. Also disclosed is an aircraft including one or more aircraft wheel brakes and the apparatus.

Abstract: An apparatus and a method for determining a thermal oxidation state of a brake of an aircraft landing gear is disclosed. Determination of the thermal oxidation state of the brake involves determining a thermal oxidation state of the brake after a braking event, using a thermal oxidation model based on an initial thermal oxidation state before the braking event and a temperature profile of the brake with respect to time.