How well does PCAS perform in a high-temperature environment?

Even though PCAS was designed to sit atop the glareshield, it should function normally in high-temperature environments, such as summer conditions. Several design elements assist with keeping PCAS within its operating temperature range. The grey color of the housing deflects much of the heat from direct sunlight. On XRX, an internal cooling fan exhausts much of the heat build-up through the “gills” in the top of the unit. You may have noticed a slight whirring sound upon startup, which is from the fan. Electronic components were selected specifically for high heat tolerances. As with any electronics, heat can adversely affect performance. However, both MRX and XRX have been successfully tested to function normally at the top end of the 150°F (65°C) temperature range.

It is important to note that the limitation on temperature is mainly the display. The internal components and compensation work well beyond the limitations specified.