Definition
Flight or surface conditions in which the pilot's ability to see outside references is reduced by darkness, weather, or atmospheric obscurations such as fog, haze, mist, smoke, precipitation, or low cloud, limiting how far and how clearly objects, terrain, and other aircraft can be seen.
Plain English
Times when you can't see very far or very clearly out of the cockpit -- whether because it's dark, foggy, hazy, raining, or smoky.
Context Anchor
Seen in night flying, weather decisions, takeoff and landing planning, and any situation where the pilot must rely on outside visual cues.
Derivation
Visibility comes from words meaning “able to be seen.” In aviation, it is not just about whether something exists in view; it is about whether the pilot can see it clearly enough to use it safely.
Why Pilots Care
These conditions raise the risk of spatial disorientation and loss of visual references, requiring pilots to rely on instruments and proper cockpit lighting techniques.
Grounding Statement
On a dark, hazy night, the runway may be nearby, but the pilot may not be able to see enough detail soon enough to use it safely.
Intuition Check
Low-visibility conditions do not only mean thick fog or official bad weather. At night, darkness, haze, glare, smoke, or weak lighting can all create low-visibility conditions even when the weather report does not sound severe.
Example Sentence 1
The instructor briefed the student on how the eyes adapt more slowly in low-visibility conditions at night.
Example Sentence 2
Preflight planning included checking for low-visibility conditions that could affect night-vision adaptation during the return leg.