Abstract: An aircraft optical display system for implementing an enhanced vision system based on weather conditions is described. The display system includes a plurality of imaging sensors configured to receive imaging input data and generate image data, where each imaging sensor is associated with one or more weather conditions. The system further includes a weather conditions input device configured to receive current weather condition information and a weather dependent imaging system configured to receive the current weather conditions information and to select one or more of the plurality of imaging sensors to provide imaging input data in accordance with the current weather conditions information.

Abstract: A head up display system includes a combiner alignment detector (24) that determines whether the combiner (22) and a cathode-ray tube (CRT) (18) are aligned within a preassigned operational tolerance. The CRT emits display symbology that reflects off the combiner toward an observer. The combiner is secured to a combiner bracket (38) which is pivotally mounted to a mounting structure (70) having a stationary relationship with the CRT. A light emitting diode (LED) (86) and a light-sensitive linear position detector (88) are secured to the mounting structure. Light rays emanating from the LED are reflected by a mirror (34), which is secured to the combiner bracket, and strike the position detector. Pivotal motion of the combiner bracket relative to the mounting structure results in movement of the mirror relative to the LED and the position detector.