Definition
In ATC automation, a status indicating that a target's data is being processed correctly and meets system validation criteria, but no conflict, alert, or warning condition has been triggered. The track is confirmed legitimate and is being tracked normally without any associated alert.
Plain English
The radar system has confirmed an aircraft's track is good and there is nothing wrong or unusual about it. Everything checks out and no warning is needed.
Context Anchor
Seen in discussions of automated airport surface safety systems and how their alert performance is evaluated.
Derivation
Three plain English words used together as a system status. 'Valid' (from Latin validus, strong or sound) means the data passes the system's checks. 'Non Alert' simply means no alert has been raised. The combination labels a track that is both confirmed and quiet.
Why Pilots Care
Confirms the display is functioning and the target is real, allowing the pilot to maintain situational awareness without unnecessary distraction from non-critical traffic.
Analogy
It is like a smoke alarm staying quiet when there is no smoke. The silence is correct because there is nothing to warn about.
Intuition Check
Do not read this as a failed alert. A Valid Non Alert means no alert was given and no alert was needed.
Example Sentence 1
Most of the targets on the controller's scope were in a valid non alert state, with only one flashing track indicating a conflict.
Example Sentence 2
After the software update, every nearby aircraft appeared as a valid non alert until one turned directly toward us and triggered the alert.