The Boeing Company

David F King

Diane C Rawlings

Mark Stephen Shander

Richard A Cote

David J Morris

Victor T Webbeking

A light emitting diode (LED) assembly is provided for use as an airplane position light which meets Federal Aviation Regulation lighting requirements and lasts longer than conventional incandescent and halogen position lights, while being relatively lightweight, cheap, and requiring relatively little power for operation. The LED assembly includes a first plurality of circuit boards in electrical communication with a base circuit board, wherein each circuit board of the first plurality of circuit boards is parallel to every other one of the first plurality of circuit boards, but is disposed at an acute angle to the base circuit board. The LED assembly also includes a second plurality of circuit boards in electrical communication with the base circuit board, wherein each circuit board of the second plurality of circuit boards is disposed at a different angle to the base circuit board such that the second plurality of circuit boards form a fan-shaped structure. In addition, the LED assembly includes a plurality of light emitting diodes electrically mounted to said first plurality of circuit boards and to said second plurality of circuit boards. The circuit boards and LEDs may be identical to facilitate construction and maintenance of the aircraft position light, and to decrease the cost of manufacturing the aircraft position light. Furthermore, LEDs may be chosen to comply with Federal Aviation Regulations lighting color requirements, obviating the need for a position light cover.

Light emitting diode assembly for use as an aircraft position light

Method and apparatus for measuring thermal radiation emitted by a sample, and for determining emissivity. The apparatus comprises a chamber in which the sample may be positioned, the chamber comprising a plurality of walls including a first wall containing an observation port. The chamber is located in a cold environment, and the walls of the chamber are brought to a selected temperature by circulating a temperature conditioned fluid through the walls. The sample is moved along a movement axis within the chamber past the observation port. As the sample is so moved, radiation emitted outwards through the observation port by the sample is measured.

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Tukwila, WA, United States of America

David F King