Understanding Dual Virtual Cockpit Displays in Modern Aircraft

The shift from analog gauges to glass cockpits has revolutionized situational awareness, but achieving optimal visibility with dual virtual cockpit displays requires deliberate configuration. In advanced avionics suites like the Garmin G1000 NXi or the Avidyne Entegra, two primary flight displays (PFDs) or a PFD and multifunction display (MFD) work in concert to present redundant, layered information. Proper setup reduces cognitive load by allowing pilots to scan separate screens for flight instruments, navigation, engine parameters, and weather data without toggling between pages. This article provides actionable, production-ready best practices for configuring dual displays to maximize clarity, reduce eye fatigue, and improve safety across all phases of flight.

Why Dual Displays Matter Beyond Redundancy

While redundancy is the headline benefit, dual displays fundamentally change how pilots process information. With a single screen, critical data must be stacked or hidden behind menus. With two screens, pilots can dedicate one display to primary flight instruments (attitude, altitude, airspeed, heading) and the second to engine monitoring, traffic, terrain, or weather radar. This parallel presentation speeds up decision-making during high-workload events such as instrument approaches or emergency diversions. FAA Instrument Flying Handbook emphasizes that minimizing head-down time and scan interruption is critical for instrument-rated pilots. Two displays, when configured correctly, reduce the need to switch between data sources and support a more efficient scan pattern.

Display Placement and Physical Layout

Optimizing Line of Sight

Place the primary flight display (PFD) directly in the pilot's forward field of view, ideally aligned with the aircraft's longitudinal axis. The secondary display (MFD or second PFD) should be positioned slightly lower or angled toward the instrument panel's center to avoid requiring excessive head movement. In side-by-side configurations common in light twins and turbine singles, the left seat pilot should have the PFD on the left and MFD on the right; the right seat pilot uses the opposite layout when flying from the right. Ensure that both screens are at a similar distance from the pilot's eyes to reduce accommodation strain.

Symmetry and Data Mapping

Arrange the displays symmetrically if the panel allows. When both screens are identical models, assign the same brightness and contrast settings so that visual cues are consistent across the panel. Symmetry also helps during cross-check—the pilot can glance from one screen to the other without re-accommodating to a different color temperature or luminance level. In panels where one screen is recessed or angled differently (common in retrofit installations), add a small bezel shroud to reduce peripheral glare and create a more uniform viewing plane.

Controlling Glare and Reflections

Glare is the enemy of readability. Position the displays so that ambient light sources (windows, overhead lighting, cockpit floodlights) do not create direct reflections on the screen surfaces. In high-wing aircraft, sunlight from above can wash out the display—install a glare shield extension or use matte anti-glare films. For low-wing aircraft, side windows often reflect onto the MFD; a simple tilt adjustment of a few degrees can eliminate the hotspot. Consider adding a sun visor that extends over both screens, especially in cockpits without a dedicated glare shield. AOPA’s glass cockpit glare guide provides further recommendations for reducing reflections without sacrificing brightness.

Calibrating Display Settings for Varied Lighting Conditions

Brightness and Contrast Calibration

Set the brightness and contrast levels to match the ambient light in the cockpit. During daylight, aim for a brightness level that allows the screen to remain legible without creating glare. Use the display's automatic brightness sensor if available, but verify that its curve aligns with your preferences—many pilots find that the “auto” setting under-compensates during dawn or dusk. For night operations, reduce brightness to prevent blooming and preserve night vision. A good rule: at night, the screen should be just bright enough to read without casting light onto the canopy or windshield. Use the contrast control to sharpen text and symbology without washing out background shading. Some systems (e.g., Garmin G3000) allow separate brightness profiles for PFD and MFD—store a day profile and a night profile for quick switching.

Font Size and Symbology Scaling

Many modern displays allow pilots to adjust font size and scale of critical data fields like altitude and airspeed tapes. Increase the font size for the PFD's tape readouts by at least one step above the default for pilots with presbyopia or when flying in turbulence where fine detail is hard to track. For the MFD, prioritize legibility of text in the engine instrument and navigational data blocks. If the system supports decluttering, configure a “busy mode” that hides non-essential data when workload is high, and a “normal mode” that shows all available information. Avoid the temptation to enlarge everything—crowded screens cause clutter and slow scan rates.

Color Coding and Alerts

Use color coding judiciously. Standard ICAO/SAE conventions should be followed: red for warnings, amber for cautions, green for normal parameters, and white or cyan for generic text. On the MFD, assign distinct colors to different data layers—for example, magenta for weather radar, cyan for traffic, and green for terrain. Ensure that your chosen color palette is visible under both daylight and dim conditions; some colors (like yellow) wash out in bright sunlight or appear as low contrast at night. Test color combinations in actual flight conditions before committing to a setup. Most glass-cockpit systems allow the pilot to customize color schemes within the settings menu; take advantage of this to improve readability for your specific eyesight.

Refresh Rate and Anti-Aliasing

While pilots typically cannot adjust the display refresh rate directly, some avionics allow selection between low-power (30 Hz) and high-performance (60 Hz) modes. For dual displays, ensure both screens operate at the same refresh rate to avoid flicker mismatch that can cause headaches during extended instrument flight. If your system offers anti-aliasing for text and symbols (common in newer synthetic vision systems), enable it—smooth edges reduce visual strain and make small symbology more readable. Note that enabling high-performance mode may increase panel heat output; monitor temperatures during preflight.

Redundancy and Failover Configuration

Master Display Reversionary Mode

In a dual-display system, if one screen fails, the surviving screen should automatically take over all critical information. Verify that your avionics are configured to composite the PFD and engine data onto the remaining screen without manual intervention. Some systems (such as the Garmin G1000) allow the pilot to push a “reversionary” button; practice this action during recurrent training so that it becomes muscle memory. Check that the standby electronic instrument (such as the Garmin G5 or backup attitude indicator) is also properly cross-referenced—dual displays do not eliminate the need for a separate backup.

Cross-Side Consistency

If the cockpit is dual-control (left and right pilots), ensure that both sets of displays are calibrated identically. Inconsistencies in brightness, contrast, or color scheme between the pilot and copilot sides can lead to confusion during cross-check or when one pilot takes over. Use a standardized configuration checklist that includes both sides. For fleets, maintain a master settings file that can be uploaded to each aircraft during maintenance to ensure uniformity across the operation.

Environmental Factors Affecting Visibility

Temperature and Humidity Control

Displays generate heat; in a closed cockpit, high ambient temperatures can cause thermal throttling or screen dimming. Configure the aircraft's ventilation to direct cool air across the panel, especially on sunny days. If you fly in humid climates, be aware that rapid temperature changes can cause internal fogging of the display bezel or LCD moisture ingress. Use a cockpit cover when parking outside, and allow the displays to acclimate gradually before applying full power. Some operators install small fans behind the panel to improve airflow over the display driver electronics.

Night Vision Compatibility

For pilots who fly with night vision goggles (NVG), ensure that the dual displays are certified for NVG compatibility (typically with a “NVG mode” that reduces near-infrared leakage and lowers brightness to NVG-safe levels). Standard display settings can flood the goggles' intensifier tubes, causing blooming and reducing outside visibility. If your aircraft does not have a dedicated NVG mode, use the lowest possible brightness and a blue-blocking filter overlay to reduce light emission. Always test the setup in a light-controlled environment before relying on it for night operations.

Training and Standard Operating Procedures

Building an Efficient Scan

Dual displays require a modified scan pattern. Instead of sweeping across six traditional instruments, the pilot now scans a PFD for attitude, speed, altitude, heading, and vertical speed, then shifts to the MFD for navigation, engine parameters, and situation awareness. Practice this transition during recurrent simulator training. Use a consistent pattern: PFD → MFD → Outside → PFD. Avoid fixating on one display; in dual-screen setups, it's easy to become absorbed by the MFD's moving map and lose awareness of primary flight instruments. Set a timer for two minutes to practice scan discipline during instrument training.

Checklists for Display Setup

Integrate display configuration into the preflight checklist. Include steps such as:

  • Verify both screens power on and boot without error messages.
  • Set brightness and contrast to the day/night profile matching current conditions.
  • Confirm the reversionary mode is armed and latched.
  • Check that both screens show identical attitude and heading (cross-side synchronization).
  • Test the standby instrument backup by covering one screen.

Document any deviations in the aircraft logbook and address them before flight. Garmin's G1000 NXi pilot guide offers a comprehensive section on display configuration that can serve as a template for your checklist.

Drills for Display Failure

Because redundancy is a primary reason for dual displays, practice partial display failures. During a training flight, have a safety pilot cover one screen and fly an approach using only the surviving display. Recover after the missed approach and repeat with the other screen covered. This drill builds confidence and reveals any settings that make the surviving screen difficult to interpret (e.g., missing engine data or decluttered navigation). The FAA’s Instrument Airman Certification Standards require proficiency with equipment failures; dual-display failure handling is an extension of that principle.

Aircraft-Specific Considerations

Retrofit Installations

When adding a second display to an existing panel, pay attention to physical alignment and wiring. Displays that are not parallel to each other or that are mounted at different depths create an unnatural stereo parallax—the pilot's eyes must accommodate different focal lengths, increasing fatigue. If possible, mount both screens on a common mounting rail and use spacer brackets to align the front bezels. Use shielded video cables to prevent electromagnetic interference between the two screens and the avionics bus. Consider adding a UPS (uninterruptible power supply) or secondary alternator to protect both displays from voltage spikes during engine start or electrical load shedding.

Helicopter and Special Applications

In helicopter cockpits with wide views and more vertical panel space, dual displays often need to be placed higher to avoid the pilot's line of sight being blocked by the cyclic. Use a split layout: one screen centered for the pilot and one offset for the copilot. Because vibration is higher in helicopters, ensure that the display mounting brackets are robust and that the screens are compliant with RTCA DO-160 for vibration. For agricultural or firefighting aircraft, where outside visibility is paramount, use smaller displays (10-inch or less) to minimize obstruction of the forward view, and rely on voice alerts for secondary data.

Ongoing Maintenance and Updates

Display performance degrades over time due to backlight aging, dust accumulation, and screen burn-in (though LCD burn-in is less common than with CRTs). Regularly clean the screen surfaces with a microfiber cloth and approved glass cleaner (avoid ammonia-based products that can strip anti-glare coatings). Recalibrate touch screens (if equipped) every 12 months or after any panel modification. Keep software/firmware updated—manufacturers often improve display rendering algorithms, color palettes, and redraw speeds with new releases. Subscribe to service bulletins from your avionics manufacturer to stay aware of known display issues. Avidyne support provides updates for their display systems that can improve legibility and reliability.

Conclusion

Dual virtual cockpit displays offer a powerful tool for enhancing visibility and situational awareness, but only when configured with intentionality. From physical placement and glare management to brightness calibration, color coding, and failover drills, every detail matters. By implementing the best practices outlined here—rooted in human factors, industry standards, and real-world flight operations—pilots can reduce workload, improve cross-check efficiency, and fly with greater confidence. Treat display configuration as an ongoing process: review settings annually, train for failures, and never settle for “good enough.” The investment in a well-optimized dual-screen setup pays dividends in safety, every flight.