Which instrument is commonly referred to as a Glass Cockpit?

• A. EFIS
• B. HSI
• C. DG
• D. RMI

Answer: (A)

Digital displays replaced many old gauges, and the instrument system behind those screens is the Electronic Flight Instrument System, EFIS. In a Glass Cockpit you see primary flight data on a large digital display (the PFD) and navigation or other data on another screen (the MFD). EFIS is the integrated system that supplies those screens with attitude, airspeed, altitude, vertical speed, and navigation data, so it’s the name most associated with a Glass Cockpit. The Horizontal Situation Indicator is a navigation display that can appear on the EFIS screens, but it isn’t the overall cockpit system. The Directional Gyro and Radio Magnetic Indicator are traditional analog instruments that have largely been replaced by digital displays in a glass cockpit, not what defines the term itself.