Fine Print

One of the keys to safe and successful instrument flight is paying attention to details. Often the difference between arriving at your destination uneventfully and not arriving there at all after diverting is hidden in the notes and symbols on an approach chart. What does it mean when a procedure is marked as “not authorized”? Doesn’t ATC protect you by refusing to clear you for an unauthorized procedure?

Key Takeaways:

• It is the pilot-in-command's sole responsibility to understand and adhere to "not authorized" (NA) instrument approach procedures, as air traffic control (ATC) will not prevent clearances for them if there's no conflict.
• "Not authorized" procedures are primarily identified by textual notes on approach charts, often indicated by "NA," or by a white "A" in a black triangle if the procedure cannot be used for alternate airport designation.
• Common reasons for procedures being "not authorized" include limitations based on time of day (e.g., night operations due to lighting or terrain), specific obstacle clearances (e.g., restricted circling directions), or meteorological conditions (e.g., temperature limits for baro-VNAV).

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