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:

• The pilot-in-command is solely responsible for understanding and adhering to "not authorized" (NA) instrument approach procedures, which are primarily identified by textual notes on approach charts, rather than relying on ATC.
• "Not authorized" conditions are often due to factors like time of day (e.g., night operations due to unlit obstacles or limited lighting), specific terrain/obstacle conflicts, or meteorological conditions such as temperature limits for baro-VNAV approaches.
• A white "A" on a black triangle specifically indicates a procedure is not authorized for use when declaring an alternate airport, typically due to lack of weather reporting or monitored navaids.
• Pilots must thoroughly read all approach chart notes during briefing to identify these restrictions and must be prepared to refuse ATC clearances for any unauthorized procedures.

Key takeaways sponsored by Aviator Pro | Start Your Training ->

See a mistake? Contact us.