Definition
A notation on instrument approach charts and procedure documents indicating that a particular procedure, minimum, operation, or option is not permitted. It is an explicit prohibition, not a limitation or restriction with conditions.
Plain English
A short way of saying 'you can't do this.' When you see NA next to something on a chart, that option is closed to you.
Context Anchor
Seen on instrument approach charts, procedure notes, airport notes, and FAA tables where a specific option is limited or prohibited.
Why Pilots Care
Attempting a procedure marked NA violates regulations and can create serious safety risks due to unassessed obstacles or conditions.
Intuition Check
NA does not mean “not applicable” or “not available” in this context. It means the item is not authorized: it is not approved for use.
Example Sentence 1
The approach plate showed 'Circling NA at night,' so the crew planned a straight-in approach for their after-dark arrival.
Example Sentence 2
Pilots must select an alternate airport because the straight-in landing minimums are marked NA at night.