An Electronic Flight Instrument System (EFIS) is a cockpit instrument display system located in the flight cockpit on the lower deck after the windshield. It is electronically powered and produces a digital output. The electronic display unit system consists of 3 different display units, the Primary Flight Display (PFD), the Navigation Display (ND) and the EICAS/ECAM depending on the engine manufacturer. There is one PFD and one ND each for the first officer and the captain. However, the EICAS/ECAMs are shared between both crews. EFIS installations vary greatly. A light aircraft might be equipped with one display unit and display flight and navigation data, while a wide-body aircraft will likely have six or more display units. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay Typical Electronic Flight Instrument System (EFIS) Display Purpose of the Electronic Flight Instrument System (EFIS) The purpose of an Electronic Flight Instrument System (EFIS) in an aircraft is to display data of outbound flight on a CRT or LCD screen to monitor the aircraft's flight progress and the proper functioning of all aircraft parts and systems. As well as displaying essential information to help the flight crew operate the aircraft safely and efficiently. EFIS units assist the pilot in controlling the aircraft and making decisions during flight to the intended destination by providing flight information and navigation information on flight performance. Electronic Flight Instrument System (EFIS) Block Diagram Operations and Functions of Each Unit of the EFIS Air Data Inertial Reference Unit The inertial reference unit is connected to aircraft sensors around the aircraft to produce flight data and air. Sensors include pitot static tube and ring laser gyroscope. The whole system can be divided into 2 units, the air data unit and the inertial reference unit. In the air data unit, pitot static tubes are used with the air data modules to convert air pressure into electrical signal quantities to the inertial reference unit via data bus. With the calculation of air speed, Mach number, temperature and barometric pressure altitude. The Air Data Inertial reference unit then compiles the information and processes it to send it to the next stage to display the result. Navigation Data Navigation data is a common block of data that provides navigation information to guide the aircraft to reach its intended destination safely and efficiently through available or decided routes and communications. Data taken from various sensors and instruments around the aircraft. Such as weather radars, transponders, etc. The navigation data consists of meteorological data, instrument landing system data, flight path data, traffic collision warning system data, etc. Which help the plane navigate properly. EFIS Control Panel The EFIS Control Panel helps give manual control to the pilot to select settings and control displays by choosing which information to display in the CRT or LCD displays. They provide pilots with controls over displays such as brightness, range and mode settings in maps, to show preferred data and to input data. Primary Flight Display (PFD) A primary flight display (PFD) is an instrument dedicated to flight information. It is a representation of the "steam indicator" instruments, combined on one display