Definition
A NOTAM and aeronautical publication contraction indicating that a stated condition, restriction, closure, or status remains in effect indefinitely until officially cancelled or amended by a subsequent notice. There is no scheduled end date.
Plain English
It means the situation stays the way it is described, with no end date, until someone officially changes it.
Context Anchor
Seen in NOTAMs, airport notices, and airspace notices when a condition is active but no end time has been published.
Why Pilots Care
When planning a flight, a UFN entry tells the pilot the condition is not going to expire on its own. It must be checked again before each flight because the original notice is the only thing that will tell you when it ends.
Intuition Check
Do not read UFN as “probably temporary” or “ending soon.” In aviation notices, UFN means no ending time has been given, so the item stays active until officially updated.
Example Sentence 1
The NOTAM stated that taxiway B was closed UFN due to construction.
Example Sentence 2
Pilots checked the latest update because the airspace restriction was listed UFN.