Definition
An operational concept in which advanced cockpit vision systems — such as Enhanced Flight Vision Systems (EFVS), Synthetic Vision Systems (SVS), and Combined Vision Systems (CVS) — give the pilot a view of the outside world equivalent to what they would see in natural visual conditions, allowing certain phases of flight to be conducted as if visual references were available, even when the actual outside visibility is reduced.
Plain English
Flying with cockpit displays that show the outside world clearly enough that the pilot can operate as though they could see it directly through the windshield, even when weather or darkness would normally block the view.
Context Anchor
Seen in discussions of combined vision system technology, especially how cockpit displays may support approaches, landings, and surface movement when natural visibility is limited.
Derivation
‘Equivalent’ comes from Latin aequus (equal) and valere (to be worth) — literally ‘worth the same.’ In this context it means the pilot's view through the vision system is treated as having the same operational value as a real visual view out the window.
Why Pilots Care
Allows safe continuation of approaches and landings in weather that would otherwise force a missed approach or diversion.
Grounding Statement
The core idea is: the pilot may not have a clear natural view outside, but the aircraft’s vision display helps provide the needed view for the operation.
Intuition Check
Equivalent does not mean identical or automatically legal for every operation. Here it means the display is intended to provide visual information comparable enough to support a specific approved operation.
Example Sentence 1
The captain briefed that the aircraft's combined vision system supported equivalent visual operations down to the published minima for the approach.
Example Sentence 2
EVO capability let the flight continue to the destination instead of diverting due to fog.