Cross-cockpit collimated display

A cross-cockpit collimated display (CCCD) is a display system used in full flight simulators (FFS) to provide the crew with a high-fidelity out-the-window view of the simulated environment around the aircraft. It is called cross-cockpit collimated because the light from a projected distant object is composed of rays that remain parallel or near-parallel across the cockpit (which typically sits two pilots side-by-side). Therefore, the projected object appears to both pilots to be realistically located in the distance, where the real object would be.

The technology was developed in the early 1980s by the British electronics company Rediffusion, and has since become the industry standard for FFS visual systems.