Definition
An installed aircraft system that uses imaging sensors — typically infrared — to produce a real-time image of the external scene, displayed on a head-up display or equivalent so the pilot can see the runway environment and surrounding terrain in conditions where natural vision alone would be limited. Under FAA rules, an approved EFVS allows the pilot to continue an instrument approach below published minimums, and in some cases to land, when the required visual references are seen on the EFVS image rather than with the naked eye.
Plain English
A camera-and-display system in the aircraft that lets the pilot see the runway and terrain through fog, haze, or darkness by showing a sensor image on a see-through display in front of them. It is approved to substitute for natural eyesight at certain points on an instrument approach.
Context Anchor
Seen in aircraft equipment descriptions, low-visibility approach procedures, and rules about when a pilot may continue an approach using approved vision equipment.
Derivation
‘Enhanced’ here means improved beyond what the unaided eye can see. ‘Flight vision system’ is the regulatory name — a vision system used in flight. The key word is ‘enhanced,’ meaning the pilot’s view is augmented by sensors, not replaced by a computer-generated picture.
Why Pilots Care
Allows approaches and landings in weather that would otherwise force a missed approach or diversion, while maintaining required safety margins.
Grounding Statement
Picture a pilot on final approach seeing a live sensor image of the runway area on a cockpit display even though the outside view through the windshield is hard to see.
Intuition Check
EFVS does not mean the pilot’s eyesight is simply “better.” It means the aircraft has approved equipment that uses sensors and a display to show the real scene ahead.
Example Sentence 1
The crew briefed the EFVS approach, noting they could descend below the published minimums only if the runway environment was visible on the head-up display.
Example Sentence 2
EFVS-equipped aircraft may be authorized to use lower decision altitudes on certain straight-in approaches.