I see some very long NOTAM messages describing a whole section of arrival or departing procedure.

Is there a standard limiting how long a NOTAM can be? In computing I usually see limits in bytes, is there such a limit on NOTAM?

  • 1
    $\begingroup$ longest I’ve ever seen was 1.5 pages A5 on very small print, so I guess NO :-( $\endgroup$
    – Radu094
    Commented Jan 8, 2018 at 11:02
  • $\begingroup$ The EAA Airventure NOTAM usually runs around 32 pages every year. $\endgroup$
    – J W
    Commented Jan 9, 2018 at 13:32

1 Answer 1


According to an FAA guide to creating NOTAMs (see pages 14 and 21), the "condition text", i.e. the body of the NOTAM...

has a max length around 1200 alpha-numeric characters. If necessary, the system will allow a user to create up to ten parts with 1200 characters each

But, that doesn't include other parts of the NOTAM, like location, date/time, graphical elements etc. I don't know if there's a limit (in kB?) for the complete NOTAM file or not; the document doesn't seem to mention anything about that. It also isn't clear from the FAA document if the ~12,000 characters is a format limitation/specification, or a tool limitation.


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