Definition
A concept under which advanced vision system technology — such as enhanced flight vision systems (EFVS), synthetic vision, and combined vision systems — allows a pilot to conduct an instrument approach, landing, and surface operations in low-visibility conditions to a level of safety and capability equivalent to that of a normal visual operation in good weather.
Plain English
Using cockpit display technology that lets a pilot see and fly the approach as clearly as if the weather were good, even when it isn't.
Context Anchor
Seen in discussions of combined vision system technology, especially where advanced displays may support low-visibility approach, landing, or surface operations.
Derivation
Equivalent' comes from Latin aequus (equal) and valere (to be worth) — literally 'of equal worth.' The phrase signals that the operation, while flown using vision system technology rather than the unaided eye, is intended to be of equal operational worth to a true visual operation.
Why Pilots Care
It permits approaches and landings at airports that would otherwise be unavailable due to weather, reducing delays and diversions while maintaining safety.
Grounding Statement
The key idea is approved visual usefulness: the display must provide enough usable outside-scene cues for the specific operation, not just a nicer picture.
Intuition Check
Do not read “equivalent visual” as “the weather has become visual” or “the pilot can treat the flight like normal outside visibility.” Here it means approved equipment provides visual information judged good enough for a specific operation.
Example Sentence 1
The crew briefed the EFVS approach knowing the operation was being conducted under equivalent visual operations principles, allowing them to descend below the published minimums using the enhanced vision display.
Example Sentence 2
With EVO authorization the aircraft completed the landing using the enhanced vision display when the runway was not visible to the naked eye.