The most prominent feature of this panel are it's six Electronic Flight Instrument System (EFIS) controlled display units that replace most conventional flight and engine instruments. There are two Primary Flight Displays (PFDs), two Navigation Displays (NDs), and a Primary and Secondary Engine Instrument and Crew Alerting Systems. Display management computers acquire and process all input from the airplane's sensors and computers to generate the display images. If a display unit fails, automatic and manual switching allow the displays to be transferred to an operable display unit. There's also two Control Display Units (CDU) which aids the crew in flight management.