What are the components of an EFIS?
An efis normally consists of a primary flight display (pfd), multi-function display (mfd), and an engine indicating and crew alerting system (eicas) display. Early efis models used cathode-ray tube (crt) displays, but liquid crystal displays (lcd) are now more common. In aviation, a flight director (fd) is a flight instrument that is overlaid on the attitude indicator that shows the pilot of an aircraft the attitude required to execute the desired flight path. Flight directors are mostly commonly used during approach and landing. They can be used with or without autopilot systems.A Primary Flight Display or PFD, found in an aircraft equipped with an Electronic Flight Instrument System, is the pilot’s primary reference for flight information.