Glass Cockpit System

Overview

The glass cockpit replaced the traditional "round dial" instrument panel — an array of dozens of individual electromechanical gauges — with a small number of large, high-resolution LCD or OLED display panels that can present any instrument format on demand. The term "glass cockpit" was coined in the early 1980s when the Boeing 767 and 757 introduced the first Electronic Flight Instrument Systems (EFIS) on a commercial jet, showing attitude, airspeed, altitude, and navigation data on cathode ray tube screens. Today every new transport aircraft uses an all-glass flight deck as standard.

The key architectural shift is from dedicated, single-purpose instruments to programmable display units driven by a common avionics computing platform. Display management computers (DMCs) or display management units (DMUs) receive data from air data, inertial reference, navigation, and systems sensors and render the appropriate pages on each screen. If a display fails, its page can be transferred to an adjacent screen — a reconfigurability impossible with analog instruments.

How It Works

A modern glass cockpit typically comprises four to six large display units arranged symmetrically for the captain and first officer. The Primary Flight Display (PFD) shows the attitude indicator, airspeed tape, altitude tape, vertical speed, heading, and flight mode annunciations — all the primary flight references in one view. The Navigation Display (ND) shows the moving map, route, weather radar overlay, traffic (TCAS), terrain (EGPWS), and wind data. Engine instruments are consolidated on the Engine Indication and Crew Alerting System (EICAS — Boeing) or Electronic Centralized Aircraft Monitor (ECAM — Airbus) pages, which also monitor dozens of aircraft systems and generate color-coded alerts.

System synoptic pages allow crews to view hydraulic, pneumatic, fuel, electrical, and pressurization system states graphically. Cursor control devices (CCDs) or touchscreens on newer aircraft allow direct interaction with map and system pages, reducing the need for dedicated overhead panel switches.

Key Components

• Primary Flight Display (PFD): The primary pilot reference, integrating attitude, airspeed, altitude, vertical speed, heading, flight director commands, and autopilot mode annunciations on one screen.
• Navigation Display (ND): Moving map showing flight plan, weather radar, TCAS traffic, terrain, VOR/DME stations, and wind vector. Multiple range and mode settings (arc, plan, rose, etc.).
• EICAS/ECAM: Engine parameters (N1/N2, EGT, fuel flow, oil pressure) plus aircraft systems monitoring and crew alerting with prioritized message lists and system diagrams.
• Display Management Computer (DMC): Central processor that renders display pages from sensor data and manages screen reconfiguration in case of display failures.
• Cursor Control Device (CCD): Trackball or touchpad used on Boeing 777/787 and Airbus A380/A350 to interact with display pages, reducing the need for dedicated controls.

Aircraft Applications

• Boeing 737-800: Honeywell or Rockwell Collins EFIS with two PFDs, two NDs, and a center EICAS display — a retrofit from the original analog 737 design.
• Airbus A320-200: Five Thales or Honeywell display units (two PFDs, two NDs, one ECAM upper/lower pair), integrated with FMGC and fly-by-wire flight computers.
• Boeing 777-300ER: Six 8-inch displays plus two CCDs per pilot, driven by the AIMS integrated avionics platform — one of the first fully integrated glass cockpits with datalink.
• Boeing 787-9: Five 15.1-inch landscape displays on a dark-panel philosophy, driven by the Common Core System with real-time health monitoring and e-enabled connectivity.
• Airbus A350-900: Six 15-inch displays with touchscreen-capable onboard information system terminal (OIS), fully integrated with the Integrated Modular Avionics (IMA) architecture.
• Embraer E190: Honeywell Primus Epic glass cockpit with five 15-inch displays and a highly integrated avionics suite optimized for single-pilot operations during abnormals.

Advantages and Limitations

Glass cockpits reduce the number of physical instruments from over 100 to fewer than 10 display units, dramatically lowering maintenance costs and improving reliability. Situational awareness improves because crews see integrated, color-coded information rather than scanning many separate gauges. Reconfigurability means a display failure rarely leaves the crew without critical information. The EICAS/ECAM dramatically reduces checklists by detecting system failures and guiding crews through appropriate actions automatically.

Pilot training is a recognized concern. Automation dependency and reduced manual flying skills have been identified by aviation safety bodies as systemic risks. Mode confusion — misunderstanding which autopilot or autothrust mode is active — has been a causal factor in several accidents. Manufacturers and regulators now require enhanced training on manual flight, automation management, and recovery from unreliable airspeed situations, which can be exacerbated when glass cockpit sensors (pitot tubes, ADCs) fail.