Which environmental factor is part of Degraded Visual Environment (DVE)?

Which environmental factor is part of Degraded Visual Environment (DVE)?

• A. Fog, smoke, blowing, snow, heavy rain, sea spray, or low illumination.
• B. Hovering or flying at night with a lack of visual cues.
• C. Clear skies with high visibility.
• D. Fog and smoke combined with blowing snow that reduces visual cues.

Answer: (D)

Degraded Visual Environment means visual references outside the aircraft are significantly reduced, so a pilot must rely more on instruments and flight rules rather than outside cues. The best choice describes fog and smoke combined with blowing snow that reduces visual cues. The combination of multiple obscuring factors creates a much more severe loss of horizon, landmarks, and depth cues than any single factor alone, which is the hallmark of a degraded visual environment. In such conditions, depth perception and spatial orientation are compromised, increasing reliance on instrument flight rules and careful cross-checking of instruments. Options that mention only one factor (like fog alone, or nighttime with few cues) or describe clear skies don’t illustrate the scenario where visual references are jointly degraded to a level that challenges situational awareness.

Degraded Visual Environment means visual references outside the aircraft are significantly reduced, so a pilot must rely more on instruments and flight rules rather than outside cues.

The best choice describes fog and smoke combined with blowing snow that reduces visual cues. The combination of multiple obscuring factors creates a much more severe loss of horizon, landmarks, and depth cues than any single factor alone, which is the hallmark of a degraded visual environment. In such conditions, depth perception and spatial orientation are compromised, increasing reliance on instrument flight rules and careful cross-checking of instruments.

Options that mention only one factor (like fog alone, or nighttime with few cues) or describe clear skies don’t illustrate the scenario where visual references are jointly degraded to a level that challenges situational awareness.