Abstract: An air induction system for an engine to remove contaminants from intake air prior to delivery to the engine. The system includes a filter formed of a filter media arranged in a generally annular shape for placement around a portion of the engine to receive intake air from an annular region surrounding the engine. A filter mount is engageable with an outer surface of the engine and configured for supporting the filter at an installed position wherein the filter is in spaced relation from the outer surface of the engine. The filter is constructed for easy installation and removal.

Abstract: An air induction system for an engine to remove contaminants from intake air prior to delivery to the engine. The system includes a filter formed of a filter media arranged in a generally annular shape for placement around a portion of the engine to receive intake air from an annular region surrounding the engine. A filter mount is engageable with an outer surface of the engine and configured for supporting the filter at an installed position wherein the filter is in spaced relation from the outer surface of the engine. The filter is constructed for easy installation and removal.

Abstract: A barrier filter for use in an helicopter to remove contaminants from intake air prior to delivery to an engine. The helicopter has an intake and a peripheral external surface adjacent to the intake. The filter includes a pleated filter element mounted flush across the intake such as to meet the contour of the peripheral external surface. The filter element comprises a porous filter media and having a surface area such that a calculated speed of air flowing through the filter, when the engine is operating at take off power (TOP) or military intermediate rated power (IRP), is less than about 30 ft/sec. The filter may be retrofit into helicopters having other contaminant removal systems. Preferably, the filter is positioned such that intake air is delivered to the engine at a pressure which is substantially independent of whether the helicopter is moving in a forward direction or hovering with no forward motion.

Abstract: A barrier filter for use in an helicopter to remove contaminants from intake air prior to delivery to an engine. The helicopter has an intake and a peripheral external surface adjacent to the intake. The filter includes a pleated filter element mounted flush across the intake such as to meet the contour of the peripheral external surface. The filter element comprises a porous filter media and having a surface area such that a calculated speed of air flowing through the filter, when the engine is operating at take off power (TOP) or military intermediate rated power (IRP), is less than about 30 ft/sec. The filter may be retrofit into helicopters having other contaminant removal systems. Preferably, the filter is positioned such that intake air is delivered to the engine at a pressure which is substantially independent of whether the helicopter is moving in a forward direction or hovering with no forward motion.

Abstract: A system and method for inspecting a visual display under test. A translational stage moves an optical instrument relative to the display in at least one of three generally orthogonal directions. The optical instrument is mounted on the translational stage and measures an electro-optical characteristic within a defined region of interest on the display. The display is mounted on a rotational stage for rotating the display about at least one of two generally orthogonal axes. A controller controls the translational and rotational stages to position the optical instrument at a desired position relative to the display and to position the display at a desired viewing angle relative to the optical instrument. The position of the optical instrument relative to the display is adjusted to maintain the optical axis of the instrument approximately centered within the defined region of interest on the display when the display is rotated.